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List of galaxies

16 Sep 2018 National Radio TV of Afghanistan

This is a general list of galaxies, for more specific lists, see lists of galaxies

Size (left) and distance (right) of a few well-known galaxies put to scale.

This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by expanding it with reliably sourced entries.

The following is a list of notable galaxies.

There are about one hundred billion galaxies in the universe (see list of nearest galaxies for a complete list), on the order of 100,000 in our Local Supercluster and an estimated number of about one to two trillion in all of the observable universe.

The discovery of the nature of galaxies as distinct from other nebulae (interstellar clouds) was made in the 1920s. The first attempts at systematic catalogues of galaxies were made in the 1960s, with the Catalogue of Galaxies and Clusters of Galaxies listing 29,418 galaxies and galaxy clusters, and with the Morphological Catalogue of Galaxies, a putatively complete list of galaxies with photographic magnitude above 15, listing 30,642. In the 1980s, the Lyons Groups of Galaxies listed 485 galaxy groups with 3,933 member galaxies. Galaxy Zoo is a project aiming at a more comprehensive list: launched in July 2007, it has classified over one million galaxy images from The Sloan Digital Sky Survey, The Hubble Space Telescope and the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey.[1]

There is no universal naming convention for galaxies, as they are mostly catalogued before it is established whether the object is or isn’t a galaxy. Mostly they are identified by their celestial coordinates together with the name of the observing project (HUDF, SDSS, 3C, CFHQS, NGC/IC, etc.)

Named galaxies[edit]

This is a list of galaxies that are well known by something other than an entry in a catalog or list, or a set of coordinates, or a systematic designation.

Image

Galaxy

Constellation

Origin of name

Notes

Andromeda

Andromeda

Andromeda, which is shortened from “Andromeda Galaxy”, gets its name from the area of the sky in which it appears, the constellation of Andromeda.

Andromeda is the closest big galaxy to the Milky Way and is expected to collide with the Milky Way around 4 billion years from now. The two will eventually merge into a single new galaxy called Milkomeda.

Black Eye Galaxy

Coma Berenices

It has a spectacular dark band of absorbing dust in front of the galaxy’s bright nucleus, giving rise to its nicknames of the “Black Eye” or “Evil Eye” galaxy.

Bode’s Galaxy

Ursa Major

Named for Johann Elert Bode who discovered this galaxy in 1774.

Cartwheel Galaxy

Sculptor

Its visual appearance is similar to that of a spoked cartwheel.

Cigar Galaxy

Ursa Major

Appears similar in shape to a cigar.

Comet Galaxy

Sculptor

This galaxy is named after its unusual appearance, looking like a comet.

The comet effect is caused by tidal stripping by its galaxy cluster, Abell 2667.

Cosmos Redshift 7

Sextans

The name of this galaxy is based on a redshift (z)measurement of nearly 7 (actually, z = 6.604).[2]

Galaxy Cosmos Redshift 7 is reported to be the brightest of distant galaxies (z > 6) and to contain some of the earliest first stars (first generation; Population III) that produced the chemical elements needed for the later formation of planets and life as we know it.[2]

Hoag’s Object

Serpens Caput

This is named after Art Hoag, who discovered this ring galaxy.

It is of the subtype Hoag-type galaxy, and may in fact be a polar-ring galaxy with the ring in the plane of rotation of the central object.

Large Magellanic Cloud

Dorado/Mensa

Named after Ferdinand Magellan

This is the fourth largest galaxy in the Local Group, and forms a pair with the SMC, and from recent research, may not be part of the Milky Way system of satellites at all.[3]

Small Magellanic Cloud

Tucana

Named after Ferdinand Magellan

This forms a pair with the LMC, and from recent research, may not be part of the Milky Way system of satellites at all.

Mayall’s Object

Ursa Major

This is named after Nicholas Mayall, of the Lick Observatory, who discovered it.[4][5][6]

Also called VV 32 and Arp 148, this is a very peculiar looking object, and is likely to be not one galaxy, but two galaxies undergoing a collision. Event in images is a spindle shape and a ring shape.

Milky Way

Sagittarius(centre)

The appearance from Earth of the galaxy – a band of light.

The galaxy containing the Sun and its Solar System, and therefore Earth.

Pinwheel Galaxy

Ursa Major

Similar in appearance to a pinwheel (toy).

Sombrero Galaxy

Virgo

Similar in appearance to a sombrero.

Sunflower Galaxy

Canes Venatici

Similar in appearance to a sunflower.

Tadpole Galaxy

Draco

The name comes from the resemblance of the galaxy to a tadpole.

This shape resulted from tidal interaction that drew out a long tidal tail.

Whirlpool Galaxy

Canes Venatici

From the whirlpool appearance this gravitationally disturbed galaxy exhibits.

Naked-eye galaxies[edit]

This is a list of galaxies that are visible to the naked eye, for at the very least, keen-eyed observers in a very dark-sky environment that is high in altitude, during clear and stable weather.

Naked-eye Galaxies

Galaxy

Apparent Magnitude

Distance

Constellation

Notes

Milky Way

-6.5 (excluding the Sun[nb 1])

0

Sagittarius(centre)

This is the galaxy containing the Sun and its Solar System, and therefore Earth.. Most things visible to the naked-eye in the sky are part of it, including the Milky Way composing the Zone of Avoidance.[7]

Large Magellanic Cloud

0.9

160 kly (50 kpc)

Dorado/Mensa

Visible only from the southern hemisphere. It is also the brightest patch of nebulosity in the sky.[7][8][9]

Small Magellanic Cloud (NGC 292)

2.7

200 kly (60 kpc)

Tucana

Visible only from the southern hemisphere.[7][10]

Andromeda Galaxy (M31, NGC 224)

3.4

2.5 Mly (780 kpc)

Andromeda

Once called the Great Andromeda Nebula, it is situated in the Andromeda constellation.[7][11]

Triangulum Galaxy (M33, NGC 598)

5.7

2.9 Mly (900 kpc)

Triangulum

Being a diffuse object, its visibility is strongly affected by even small amounts of light pollution, ranging from easily visible in direct vision in truly dark skies to a difficult averted vision object in rural/suburban skies.[12]

Centaurus A(NGC 5128)

6.84

13.7 ± 0.9 Mly (4.2 ± 0.3 Mpc)

Centaurus

Centaurus A has been spotted with the naked eye by Stephen James O’Meara.[13]

Bode’s Galaxy(M81, NGC 3031)

6.94

12 Mly (3.6 Mpc)

Ursa Major

Highly experienced amateur astronomers may be able to see Messier 81 under exceptional observing conditions.[14][15][16]

Messier 83 (NGC 5236)

8.2

14.7 Mly (4.5 Mpc)

Hydra

M83 has reportedly been seen with the naked eye.[17]

Sagittarius Dwarf Spheroidal Galaxy is not listed, because it is not discernible as being a separate galaxy in the sky.

Observational firsts[edit]

First

Galaxy

Constellation

Year

Notes

First spiral galaxy

Messier 51

Canes Venatici

1845

Lord William Parsons, Earl of Rosse discovered the first spiral nebula from observing M51 (recognition of the spiral shape without the recognition of the object as outside the Milky Way).[18]

Notion of galaxy

Milky Way Galaxy & Messier 31

Sagittarius (centre) & Andromeda

1923

Recognition of the Milky Way and the Andromeda nebula as two separate galaxies by Edwin Hubble.

First Seyfert galaxy

NGC 1068 (M77)

Cetus

1943 (1908)

The characteristics of Seyfert galaxies were first observed in M77 in 1908, however, Seyferts were defined as a class in 1943.[19]

First radio galaxy

Cygnus A

Cygnus

1951/2

Of several items, then called radio stars, Cygnus A was identified with a distant galaxy, being the first of many radio stars to become a radio galaxy.[20][21]

First quasar

3C273

3C48

Virgo

Triangulum

1962

1960

3C273 was the first quasar with its redshift determined, and by some considered the first quasar. 3C48 was the first “radio-star” with an unreadable spectrum, and by others considered the first quasar.

First superluminal galactic jet

3C279

Virgo

1971

The jet is emitted by a quasar

First low-surface-brightness galaxy

Malin 1

Coma Berenices

1986

Malin 1 was the first verified LSB galaxy. LSB galaxies had been first theorized in 1976.[22]

First superluminal jet from a Seyfert

III Zw 2

Pisces[23]

2000

[24]

Prototypes[edit]

This is a list of galaxies that became prototypes for a class of galaxies.

Prototype Galaxies

Class

Galaxy

Constellation

Date

Notes

BL Lac object

BL Lacertae (BL Lac)

Lacerta

This AGN was originally catalogued as a variable star, and “stars” of its type are considered BL Lac objects.

Hoag-type Galaxy

Hoag’s Object

Serpens Caput

This is the prototype Hoag-type Ring Galaxy

Giant LSB galaxy

Malin 1

Coma Berenices

1986

[25]

FR II radio galaxy

(double-lobed radio galaxy)

Cygnus A

Cygnus

1951

[26]

starburst galaxy

Cigar Galaxy

Ursa Major

Closest and most distant known galaxies by type[edit]

Title

Galaxy

Constellation

Distance

Notes

Closest galaxy

Canis Major Dwarf

Canis Major

0.025 Mly

Discovered in 2003, a satellite of the Milky Way, slowly being cannibalised by it.

Most distant galaxy

GN-z11

Ursa Major

z=11.09

With an estimated distance of about 32 billion light-years, astronomers announced it as the most distant astronomical galaxy known.[27]

Closest quasar

3C 273

Virgo

z=0.158

First identified quasar, this is the most commonly accepted nearest quasar.

Most distant quasar

ULAS J1120+0641

Leo

z=7.085

Discovered in June 29, 2011 via UKIRT Infrared Deep Sky Survey; first quasar discovered beyond the redshift of 7.

Closest radio galaxy

Centaurus A (NGC 5128, PKS 1322-427)

Centaurus

13.7 Mly

[28]

Most distant radio galaxy

TN J0924-2201

Hydra

z=5.2

Closest Seyfert galaxy

Circinus Galaxy

Circinus

13 Mly

This is also the closest Seyfert 2 galaxy. The closest Seyfert 1 galaxy is NGC 4151.

Most distant Seyfert galaxy

z=

Closest blazar

Markarian 421 (Mrk 421, Mkn 421, PKS 1101+384, LEDA 33452)

Ursa Major

z=0.030

This is a BL Lac object.[29][30]

Most distant known blazar

Q0906+6930

Ursa Major

z=5.47

This is a flat spectrum radio-loud quasar type blazar.[31][32]

Closest BL Lac object

Markarian 421 (Mkn 421, Mrk 421, PKS 1101+384, LEDA 33452)

Ursa Major

z=0.030

[29][30]

Most distant BL Lac object

z=

Closest LINER

Most distant LINER

z=

Closest LIRG

Most distant LIRG

z=

Closest ULIRG

IC 1127 (Arp 220/APG 220)

Serpens Caput

z=0.018

[33]

Most distant ULIRG

z=

Closest starburst galaxy

Cigar Galaxy (M82, Arp 337/APG 337, 3C 231, Ursa Major A)

Ursa Major

3.2 Mpc

[34][35]

Most distant starburst galaxy

SPT 0243-49

z= 5.698

[36][37]

Closest galaxies[edit]

See also: List of nearest galaxies

5 Closest Galaxies

Rank

Galaxy

Distance

Notes

1

Milky Way Galaxy

0

This is the galaxy containing the Sun and its Solar System, and therefore Earth.

2

Canis Major Dwarf

0.025 Mly

3

Virgo Stellar Stream

0.030 Mly

4

Sagittarius Dwarf Elliptical Galaxy

0.081 Mly

5

Large Magellanic Cloud

0.163 Mly

Largest satellite galaxy of the Milky Way

6

Small Magellanic Cloud

0.197 Mly

Mly represents millions of light-years, a measure of distance.

Distances are measured from Earth, with Earth being at zero.

Nearest Galaxies by Type

Title

Galaxy

Date

Distance

Notes

Nearest galaxy

Milky Way

always

0

This is the galaxy containing the Sun and its Solar System, and therefore Earth.

Nearest galaxy to our own

Canis Major Dwarf

2003

0.025 Mly

The absolute closest galaxy

Nearest dwarf galaxy

Canis Major Dwarf

2003

0.025 Mly

Nearest major galaxy to our own

Andromeda Galaxy

always

2.54 Mly

First identified as a separate galaxy in 1923

Nearest giant galaxy

Centaurus A

12 Mly

Nearest Neighboring Galaxy Title-holder

Galaxy

Date

Distance

Notes

Canis Major Dwarf

2003

0.025 Mly

Sagittarius Dwarf Elliptical Galaxy

1994 − 2003

0.081 Mly

Large Magellanic Cloud

antiquity − 1994

0.163 Mly

This is the upper bound, as it is nearest galaxy observable with the naked-eye.

Small Magellanic Cloud

1913–1914

0.197 Mly

This was the first intergalactic distance measured. In 1913, Ejnar Hertzsprung measures the distance to SMC using Cepheid variables. In 1914, he did it for LMC.

Andromeda Galaxy

1923

2.5 Mly

This was the first galaxy determined to not be part of the Milky Way.

Mly represents millions of light-years, a measure of distance.

Distances are measured from Earth, with Earth being at zero.

Most distant galaxies[edit]

See also: List of the most distant astronomical objects

Most Remote Galaxies by Type

Title

Galaxy

Date

Redshift

Notes

Candidate most remote galaxy (photometric redshift)

UDFj-39546284

2011

z=11.9(?)

This was proposed to be the remotest object known at time of discovery. In late 2012, its distance was revised from z=10.3 to 11.9,[38][39] however, recent re-analyses suggest it is likely to be at much lower redshift.[40]

Most remote galaxy confirmed (spectroscopic redshift)

GN-z11

2016

z=11.09

As of March 2016, GN-z11 was the most distant known galaxy.[27]

Most remote quasar

ULAS J1120+0641

2011

z=7.085

This is the undisputed most remote quasar of any type, and the first with a redshift beyond 7.

Further information: List of quasars

Most distant non-quasar SMG

Baby Boom Galaxy(EQ J100054+023435)

2008

z=4.547

[41]

grand-design spiral galaxy

Q2343-BX442

2012

z=2.18

[42]

z represents redshift, a measure of recessional velocity and inferred distance due to cosmological expansion

Timeline of Most Remote Galaxy Record-holders

Galaxy

Date

Distance

(z=Redshift)

Notes

GN-z11

2016 − 

z=11.09

Announced March 2016.[27]

EGSY8p7

(EGSY-2008532660)

2015 − 2016

z=8.68

This galaxy’s redshift was determined by examining its Lyman-alpha emissions, which were released in August 2015.[43][44][45]

EGS-zs8-1

2015 − 2015

z=7.730

This was the most distant galaxy as of May 2015.[45][46][47]

Z8 GND 5296

2013 − 2015

z=7.51

[48]

SXDF-NB1006-2

2012 − 2013

z=7.215

[49]

GN-108036

2012 − 2012

z=7.213

[50]

BDF-3299

2012 − 2013

z=7.109

[51]

IOK-1

2006 − 2010

z=6.96

This was the remotest object known at time of discovery. In 2009, gamma ray burst GRB 090423 was discovered at z=8.2, taking the title of most distant object. The next galaxy to hold the title also succeeded GRB 090423, that being UDFy-38135539.[52][53][54]

SDF J132522.3+273520

2005 − 2006

z=6.597

This was the remotest object known at time of discovery.[54][55]

SDF J132418.3+271455

2003 − 2005

z=6.578

This was the remotest object known at time of discovery.[55][56][57][58]

HCM-6A

2002 − 2003

z=6.56

This was the remotest object known at time of discovery. The galaxy is lensed by galaxy cluster Abell 370. This was the first galaxy, as opposed to quasar, found to exceed redshift 6. It exceeded the redshift of quasar SDSSp J103027.10+052455.0 of z=6.28[56][57][59][60][61][62]

SSA22−HCM1

1999 − 2002

z=5.74

This was the remotest object known at time of discovery. In 2000, the quasar SDSSp J104433.04-012502.2 was discovered at z=5.82, becoming the most remote object in the universe known. This was followed by another quasar, SDSSp J103027.10+052455.0 in 2001, the first object exceeding redshift 6, at z=6.28[63][64]

HDF 4-473.0

1998 − 1999

z=5.60

This was the remotest object known at the time of discovery.[64]

RD1 (0140+326 RD1)

1998

z=5.34

This was the remotest object known at time of discovery. This was the first object found beyond redshift 5.[64][65][66][67][68]

CL 1358+62 G1 & CL 1358+62 G2

1997 − 1998

z=4.92

These were the remotest objects known at the time of discovery. The pair of galaxies were found lensed by galaxy cluster CL1358+62 (z=0.33). This was the first time since 1964 that something other than a quasar held the record for being the most distant object in the universe. It exceeded the mark set by quasar PC 1247-3406 at z=4.897[64][66][67][69][70][71]

From 1964 to 1997, the title of most distant object in the universe were held by a succession of quasars.[71] That list is available at list of quasars.

8C 1435+63

1994 − 1997

z=4.25

This is a radio galaxy. At the time of its discovery, quasar PC 1247-3406 at z=4.73, discovered in 1991 was the most remote object known. This was the last radio galaxy to hold the title of most distant galaxy. This was the first galaxy, as opposed to quasar, that was found beyond redshift 4.[64][72][73][74]

4C 41.17

1990 − 1994

z=3.792

This is a radio galaxy. At the time of its discovery, quasar PC 1158+4635, discovered in 1989, was the most remote object known, at z=4.73 In 1991, quasar PC 1247-3406, became the most remote object known, at z=4.897[64][73][74][75][76]

1 Jy 0902+343 (GB6 B0902+3419, B2 0902+34)

1988 − 1990

z=3.395

This is a radio galaxy. At the time of discovery, quasar Q0051-279 at z=4.43, discovered in 1987, was the most remote object known. In 1989, quasar PC 1158+4635 was discovered at z=4.73, making it the most remote object known. This was the first galaxy discovered above redshift 3. It was also the first galaxy found above redshift 2.[64][76][77][78][79]

3C 256

1984 − 1988

z=1.819

This is a radio galaxy. At the time, the most remote object was quasar PKS 2000-330, at z=3.78, found in 1982.[64][80]

3C 241

1984

z=1.617

This is a radio galaxy. At the time, the most remote object was quasar PKS 2000-330, at z=3.78, found in 1982.[81][82]

3C 324

1983 − 1984

z=1.206

This is a radio galaxy. At the time, the most remote object was quasar PKS 2000-330, at z=3.78, found in 1982.[64][81][83]

3C 65

1982 − 1983

z=1.176

This is a radio galaxy. At the time, the most remote object was quasar OQ172, at z=3.53, found in 1974. In 1982, quasar PKS 2000-330 at z=3.78 became the most remote object.

3C 368

1982

z=1.132

This is a radio galaxy. At the time, the most remote object was quasar OQ172, at z=3.53, found in 1974.[64]

3C 252

1981 − 1982

z=1.105

This is a radio galaxy. At the time, the most remote object was quasar OQ172, at z=3.53, found in 1974.

3C 6.1

1979 –

z=0.840

This is a radio galaxy. At the time, the most remote object was quasar OQ172, at z=3.53, found in 1974.[64][84]

3C 318

1976 –

z=0.752

This is a radio galaxy. At the time, the most remote object was quasar OQ172, at z=3.53, found in 1974.[64]

3C 411

1975 –

z=0.469

This is a radio galaxy. At the time, the most remote object was quasar OQ172, at z=3.53, found in 1974.[64]

From 1964 to 1997, the title of most distant object in the universe were held by a succession of quasars.[71] That list is available at list of quasars.

3C 295

1960 –

z=0.461

This is a radio galaxy. This was the remotest object known at time of discovery of its redshift. This was the last non-quasar to hold the title of most distant object known until 1997. In 1964, quasar 3C 147 became the most distant object in the universe known.[64][71][85][86][87]

LEDA 25177 (MCG+01-23-008)

1951 − 1960

z=0.2

(V=61000 km/s)

This galaxy lies in the Hydra Supercluster. It is located at B1950.0 08h 55m 4s +03° 21′ and is the BCG of the fainter Hydra Cluster Cl 0855+0321 (ACO 732).[64][87][88][89][90][91][92][93]

LEDA 51975 (MCG+05-34-069)

1936 –

z=0.13

(V=39000 km/s)

The brightest cluster galaxy of the Bootes cluster (ACO 1930), an elliptical galaxy at B1950.0 14h 30m 6s +31° 46′ apparent magnitude 17.8, was found by Milton L. Humason in 1936 to have a 40,000 km/s recessional redshift velocity.[91][94][95]

LEDA 20221 (MCG+06-16-021)

1932 –

z=0.075

(V=23000 km/s)

This is the BCG of the Gemini Cluster (ACO 568) and was located at B1950.0 07h 05m 0s +35° 04′[94][96]

BCG of WMH Christie’s Leo Cluster

1931 − 1932

z=

(V=19700 km/s)

[96][97][98][99]

BCG of Baede’s Ursa Major Cluster

1930 − 1931

z=

(V=11700 km/s)

[99][100]

NGC 4860

1929 − 1930

z=0.026

(V=7800 km/s)

[101][102]

NGC 7619

1929

z=0.012

(V=3779 km/s)

Using redshift measurements, NGC 7619 was the highest at the time of measurement. At the time of announcement, it was not yet accepted as a general guide to distance, however, later in the year, Edwin Hubble described redshift in relation to distance, leading to a seachange, and having this being accepted as an inferred distance.[101][103][104]

NGC 584 (Dreyer nebula 584)

1921 − 1929

z=0.006

(V=1800 km/s)

At the time, nebula had yet to be accepted as independent galaxies. However, in 1923, galaxies were generally recognized as external to the Milky Way.[91][101][103][105][106][107][108]

M104 (NGC 4594)

1913 − 1921

z=0.004

(V=1180 km/s)

This was the second galaxy whose redshift was determined; the first being Andromeda – which is approaching us and thus cannot have its redshift used to infer distance. Both were measured by Vesto Melvin Slipher. At this time, nebula had yet to be accepted as independent galaxies. NGC 4594 was originally measured as 1000 km/s, then refined to 1100, and then to 1180 in 1916.[101][105][108]

M81

antiquity – 20th century

antiquity – 1913 (based on redshift)

antiquity – 1930 (based on Cepheids)

11.8 Mly (z=-0.10)

This is the lower bound, as it is remotest galaxy observable with the naked-eye. It is 12 million light-years away. Redshift cannot be used to infer distance, because it is moving toward us faster than cosmological expansion.

Messier 101

1930 –

Using the pre-1950s Cepheid measurements, M101 was one of the most distant so measured.

Triangulum Galaxy

1924–1930

In 1924, Edwin Hubble announced the distance to M33 Triangulum.

Andromeda Galaxy

1923–1924

In 1923, Edwin Hubble measured the distance to Andromeda, and settled the question of whether or not there were galaxies, or if everything was in the Milky Way.

Small Magellanic Cloud

1913–1923

This was the first intergalactic distance measured. In 1913, Ejnar Hertzsprung measures the distance to SMC using Cepheid variables.

z represents redshift, a measure of recessional velocity and inferred distance due to cosmological expansion

quasars and other AGN are not included on this list, since they are only galactic cores, unless the host galaxy was observed when it was most distant

Timeline notes[edit]

MACS0647-JD, discovered in 2012, with z=10.7, does not appear on this list because it has not been confirmed with a spectroscopic redshift.[109]

UDFy-38135539, discovered in 2009, with z=8.6, does not appear on this list because its claimed redshift is disputed.[110] Follow-up observations have failed to replicate the cited redshift measurement.

A1689-zD1, discovered in 2008, with z=7.6, does not appear on this list because it has not been confirmed with a spectroscopic redshift.

Abell 68 c1 and Abell 2219 c1, discovered in 2007, with z=9, do not appear on this list because they have not been confirmed.[111]

IOK4 and IOK5, discovered in 2007, with z=7, do not appear on this list because they have not been confirmed with a spectroscopic redshift.

Abell 1835 IR1916, discovered in 2004, with z=10.0, does not appear on this list because its claimed redshift is disputed. Some follow-up observations have failed to find the object at all.

STIS 123627+621755, discovered in 1999, with z=6.68, does not appear on this list because its redshift was based on an erroneous interpretation of an oxygen emission line as a hydrogen emission line.[112][113][114]

BR1202-0725 LAE, discovered in 1998 at z=5.64 does not appear on the list because it was not definitively pinned. BR1202-0725 (QSO 1202-07) refers to a quasar that the Lyman alpha emitting galaxy is near. The quasar itself lies at z=4.6947[65][68]

BR2237-0607 LA1 and BR2237-0607 LA2 were found at z=4.55 while investigating around the quasar BR2237-0607 in 1996. Neither of these appear on the list because they were not definitively pinned down at the time. The quasar itself lies at z=4.558[115][116]

Two absorption dropouts in the spectrum of quasar BR 1202-07 (QSO 1202-0725, BRI 1202-0725, BRI1202-07) were found, one in early 1996, another later in 1996. Neither of these appear on the list because they were not definitively pinned down at the time. The early one was at z=4.38, the later one at z=4.687, the quasar itself lies at z=4.695[64][117][118][119][120]

In 1986, a gravitationally lensed galaxy forming a blue arc was found lensed by galaxy cluster CL 2224-02 (C12224 in some references). However, its redshift was only determined in 1991, at z=2.237, by which time, it would no longer be the most distant galaxy known.[121][122]

An absorption drop was discovered in 1985 in the light spectrum of quasar PKS 1614+051 at z=3.21 This does not appear on the list because it was not definitively fixed down. At the time, it was claimed to be the first non-QSO galaxy found beyond redshift 3. The quasar itself is at z=3.197[64][123]

In 1975, 3C 123 was incorrectly determined to lie at z=0.637 (actually z=0.218)[124][125]

From 1964 to 1997, the title of most distant object in the universe was held by a succession of quasars.[71] That list is available at list of quasars.

In 1958, cluster Cl 0024+1654 and Cl 1447+2619 were estimated to have redshifts of z=0.29 and z=0.35 respectively. However, no galaxy was spectroscopically determined.[87]

Galaxies by brightness and power[edit]

Title

Galaxy

Data

Notes

Intrinsically brightest galaxy

Baby Boom Galaxy

[verification needed]

Starburst galaxy located 12 billion light years away

Brightest galaxy to the naked eye

Large Magellanic Cloud

Apparent magnitude 0.6

This galaxy has high surface brightness combined with high apparent brightness.

Intrinsically faintest galaxy

Boötes Dwarf Galaxy (Boo dSph)

Absolute magnitude-6.75

This does not include dark galaxies.

Lowest surface brightness galaxy

Andromeda IX

Most luminousgalaxy

WISE J224607.57-052635.0

As of May 21, 2015, WISE-J224607.57-052635.0-20150521 is the most luminous galaxy discovered and releases 10,000 times more energy than the Milky Way galaxy, although smaller. Nearly 100 percent of the light escaping from this dusty galaxy is infrared radiation.[126][127] (Image)

Brightest distant galaxy (z > 6)

Cosmos Redshift 7

Galaxy Cosmos Redshift 7 is reported to be the brightest of distant galaxies (z > 6) and to contain some of the earliest first stars(first generation; Population III) that produced the chemical elements needed for the later formation of planets and life as we know it.[2][128]

Galaxies by mass and density[edit]

Title

Galaxy

Data

Notes

Least massive galaxy

Segue 2

~550,000 MSun

This is not considered a star cluster, as it is held together by the gravitational effects of dark matter rather than just the mutual attraction of the constituent stars, gas and black holes.[129][130]

Most massive galaxy

ESO 146-IG 005

~30×1012 MSun

Central galaxy in Abell 3827, 1.4 Gly distant.[131][132]

Most dense galaxy

M85-HCC1

This is an ultra-compact dwarf galaxy [133]

Least dense galaxy

Most massive spiral galaxy

ISOHDFS 27

1.04×1012 MSun

The preceding most massive spiral was UGC 12591[134]

Least massive galaxy with globular cluster(s)

Andromeda I

[135]

Field galaxies[edit]

Main article: Field galaxy

List of field galaxies

Galaxy

Data

Notes

NGC 4555

SDSS J1021+1312

[136]

A field galaxy is a galaxy that does not belong to a larger cluster of galaxies and hence is gravitationally alone.

Interacting galaxies[edit]

Galaxies in tidal interaction

Galaxies

Data

Notes

Milky Way Galaxy

Large Magellanic Cloud

Small Magellanic Cloud

The Magellanic Clouds are being tidally disrupted by the Milky Way Galaxy, resulting in the Magellanic Stream drawing a tidal tail away from the LMC and SMC, and the Magellanic Bridge drawing material from the clouds to our galaxy.

Messier 51 (Arp 85)

Whirlpool Galaxy(NGC 5194, M51a)

NGC 5195 (M51b)

The smaller galaxy NGC 5195 is tidally interacting with the larger Whirlpool Galaxy, creating its grand design spiral galaxy architecture.

M81

M82

NGC 3077

These three galaxies interact with each other and draw out tidal tails, which are dense enough to form star clusters. The bridge of gas between these galaxies is known as Arp’s Loop.[137]

NGC 6872 and IC 4970

NGC 6872

IC 4970

NGC 6872 is a barred spiral galaxy with a grand design spiral nucleus, and distinct well-formed outer barred-spiral architecture, caused by tidal interaction with satellite galaxy IC 4970.

Tadpole Galaxy

The Tadpole Galaxy tidally interacted with another galaxy in a close encounter, and remains slightly disrupted, with a long tidal tail.

Galaxies in non-merger significant collision

Galaxies

Data

Notes

Arp 299 (NGC 3690 & IC 694)

These two galaxies have recently collided and are now both barred irregular galaxies.

Galaxies disrupted post significant non-merger collisions

Galaxies

Data

Notes

Mayall’s Object

This is a pair of galaxies, one which punched through the other, resulting in a ring galaxy.

Galaxy mergers[edit]

Galaxies undergoing near-equal merger

Galaxies

Data

Notes

Antennae Galaxies (Ringtail Galaxy, NGC 4038 & NGC 4039, Arp 244)

2 galaxies

Two spiral galaxies currently starting a collision, tidally interacting, and in the process of merger.

Butterfly Galaxies (Siamese Twins Galaxies, NGC 4567 & NGC 4568)

2 galaxies

Two spiral galaxies in the process of starting to merge.

Mice Galaxies (NGC 4676, NGC 4676A & NGC 4676B, IC 819 & IC 820, Arp 242)

2 galaxies

Two spiral galaxies currently tidally interacting and in the process of merger.

NGC 520

2 galaxies

Two spiral galaxies undergoing collision, in the process of merger.

NGC 2207 and IC 2163 (NGC 2207 & IC 2163)

2 galaxies

These are two spiral galaxies starting to collide, in the process of merger.

NGC 5090 and NGC 5091 (NGC 5090 & NGC 5091)

2 galaxies

These two galaxies are in the process of colliding and merging.

NGC 7318 (Arp 319, NGC 7318A & NGC 7318B)

2 galaxies

These are two starting to collide

Four galaxies in CL0958+4702

4 galaxies

These four near-equals at the core of galaxy cluster CL 0958+4702 are in the process of merging.[138]

Galaxy protocluster LBG-2377

z=3.03

This was announced as the most distant galaxy merger ever discovered. It is expected that this proto-cluster of galaxies will merge to form a brightest cluster galaxy, and become the core of a larger galaxy cluster.[139][140]

Recently merged galaxies of near-equals

Galaxy

Data

Notes

Starfish Galaxy (NGC 6240, IC 4625)

This recently coalesced galaxy still has two prominent nuclei.

Galaxies undergoing disintegration by cannibalization

Disintegrating Galaxy

Consuming Galaxy

Notes

Canis Major Dwarf Galaxy

Milky Way Galaxy

The Monoceros Ring is thought to be the tidal tail of the disrupted CMa dg.

Virgo Stellar Stream

Milky Way Galaxy

This is thought to be a completely disrupted dwarf galaxy.

Sagittarius Dwarf Elliptical Galaxy

Milky Way Galaxy

M54 is thought to be the core of this dwarf galaxy.

Objects considered destroyed galaxies

Defunct Galaxy

Destroyer

Notes

Omega Centauri

Milky Way Galaxy

This is now categorized a globular cluster of the Milky Way. However, it is considered the core of a dwarf galaxy that the Milky Way cannibalized.[141]

Mayall II

Andromeda Galaxy

This is now categorized a globular cluster of Andromeda. However, it is considered the core of a dwarf galaxy that Andromeda cannibalized.

Galaxies with some other notable feature[edit]

Galaxy name

Distance

Constellation

Property

Notes

M87

Virgo

This is the central galaxy of the Virgo Cluster, the central cluster of the Local Supercluster[142]

M102

Draco (Ursa Major)

[clarification needed]

This galaxy cannot be definitively identified, with the most likely candidate being NGC 5866, and a good chance of it being a misidentification of M101. Other candidates have also been suggested.

NGC 2770

Lynx

“Supernova Factory”

NGC 2770 is referred to as the “Supernova Factory” due to three recent supernovae occurring within it.

NGC 3314 (NGC 3314a and NGC 3314b)

Hydra

exact visual alignment

This is a pair of spiral galaxies, one superimposed on another, at two separate and distinct ranges, and unrelated to each other. It is a rare chance visual alignment.

ESO 137-001

Triangulum Australe

“tail” feature

Lying in the galaxy cluster Abell 3627, this galaxy is being stripped of its gas by the pressure of the intracluster medium (ICM), due to its high speed traversal through the cluster, and is leaving a high density tail with large amounts of star formation. The tail features the largest amount of star formation outside of a galaxy seen so far. The galaxy has the appearance of a comet, with the head being the galaxy, and a tail of gas and stars.[143][144][145][146]

Comet Galaxy

Sculptor

interacting with a galaxy cluster

Lying in galaxy cluster Abell 2667, this spiral galaxy is being tidally stripped of stars and gas through its high speed traversal through the cluster, having the appearance of a comet.

4C 37.11

230 Mpc

Perseus

Least separation between binary central black holes, at 24 ly (7.3 pc)

OJ 287 has an inferred pair with a 12-year orbital period, and thus would be much closer than 4C 37.11’s pair.

SDSS J150636.30+540220.9 (“SDSS J1506+54”)

z=0.608

Boötes

15h 06m 36.30s+54° 02′ 20.9″

Most efficient star production

Most extreme example in the list of moderate-redshift galaxies with the highest density starbursts yet observed found in the Wide-field Infrared Survey Explorer data (Diamond-Stanic et al. 2012).[147]

Cosmos Redshift 7

z = 6.604 (12.9 billion light-years)

Sextans

Brightest distant galaxy (z > 6)

Galaxy Cosmos Redshift 7 is reported to be the brightest of distant galaxies (z > 6) and to contain some of the earliest first stars (first generation; Population III) that produced the chemical elements needed for the later formation of planets and life as we know it.[2][128]

This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by expanding it with reliably sourced entries.

Lists of galaxies[edit]

Main article: Lists of galaxies

Local Group

List of nearest galaxies

List of polar-ring galaxies

List of spiral galaxies

List of quasars

Original Link: https://rta.org.af/eng/2018/09/16/list-of-galaxies/

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