List of galaxies
The following is a list of notable galaxies.
There are about 50 galaxies in our Local Group (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 170 billion 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 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 comprising 30,642 items. 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 2007 it catalogued some 50 million galaxies by 2011 (some 0.03% of the estimated total).
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.)
- 1 Named galaxies
- 2 Naked-eye galaxies
- 3 Observational firsts
- 4 Prototypes
- 5 Closest and most distant galaxies by type
- 6 Galaxies by brightness and power
- 7 Galaxies by mass and density
- 8 Field galaxies
- 9 Interacting galaxies
- 10 Galaxies with some other notable feature
- 11 Objects mistakenly identified as galaxies
- 12 Lists of galaxies
- 13 See also
- 14 Notes
- 15 References
- 16 External links
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.
|Galaxy||Constellation||Origin of name||Notes|
|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.|
|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.|
|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.||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.|
|Pinwheel Galaxy||Ursa Major||Similar in appearance to a pinwheel (toy).|
|Sombrero Galaxy||Virgo||Similar in appearance to a sombrero.|
|Sunflower Galaxy||Canes Venatici|
|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.|
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.
|Milky Way||-26.74 (≈ (the Sun)[nb 1])||0||Sagittarius (centre)||This is our galaxy, most things visible to the naked-eye in the sky are part of it, including the Milky Way composing the Zone of Avoidance.|
|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.|
|Small Magellanic Cloud (NGC 292)||2.7||200 kly (60 kpc)||Tucana||Visible only from the southern hemisphere.|
|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.|
|Omega Centauri (NGC5139)||3.7||18 kly (5.5 kpc)||Centaurus||Once thought to be a star and later a globular cluster, Omega Centauri was confirmed as having a black hole at its center and thus its status has been changed to being a dwarf galaxy as of April 2010.
This is still debated.
|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.|
|Centaurus A (NGC 5128)||7.8||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|
|Bode's Galaxy (M81, NGC 3031)||7.89||12 Mly (3.6 Mpc)||Ursa Major||Highly experienced amateur astronomers may be able to see Messier 81 under exceptional observing conditions.|
|Sculptor Galaxy (NGC 253)||8.0||11.4 ± 0.7 Mly (3.5 ± 0.2 Mpc)||Sculptor||According to Brian A. Skiff, the naked-eye visibility of this galaxy is discussed in an old Sky & Telescope letter or note from the late 1960s or early 1970s.|
|Messier 83 (NGC 5236)||8.2||14.7 Mly (4.5 Mpc)||Hydra||M83 has reportedly been seen with the naked eye.|
- Sagittarius Dwarf Elliptical Galaxy is not listed, because it is not discernible as being a separate galaxy in the sky.
|First galaxy||Milky Way Galaxy & Andromeda Galaxy||Sagittarius (centre) & Andromeda||1923||Edwin Hubble determined the distance to the Andromeda Nebula, and found that it could not be part of the Milky Way, so defining that Milky Way was not the entire universe, and making the two separate objects, and two galaxies. However, the first galaxies seen would be all of the naked-eye galaxies, but they were not identified as such until the 20th century.|
|First radio galaxy||Cygnus A||Cygnus||1952||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.|
|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 Seyfert galaxy||NGC 1068 (M77)||Cetus||1908||The characteristics of Seyfert galaxies were first observed in M77 in 1908, however, Seyferts were defined as a class in 1943.|
|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.|
|First radio galaxy||Cygnus A||Cygnus||1951|||
|First discovered object, later identified to be a cannibalized galaxy||Omega Centauri||Centaurus||1677||Omega Centauri is considered the core of a disrupted dwarf spheroidal galaxy cannibalized by the Milky Way, and was originally catalogued in 1677 as a nebula. It is currently catalogued as a globular cluster.|
|First superluminal galactic jet||3C279||Virgo||1971||The jet is emitted by a quasar|
|First superluminal jet from a Seyfert||III Zw 2||Pisces||2000|||
|First spiral galaxy||Whirlpool Galaxy||Canes Venatici||1845||Lord William Parsons, Earl of Rosse discovered the first spiral nebula from observing the M51 white nebula.|
This is a list of galaxies that became prototypes for a class of galaxies.
|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|||
|FR II radio galaxy
(double-lobed radio galaxy)
Closest and most distant galaxies by type
|Closest neighbouring galaxy||Canis Major Dwarf||Canis Major||0.025 Mly||Discovered in 2003, a satellite of the Milky Way, slowly being cannibalized by it.|
|Most distant galaxy||UDFj-39546284||Fornax||z=11.9 ??||With an estimated distance of about 13.2 billion light-years (comoving distance), it is announced as the oldest and farthest astronomical object known. In late 2012, the distance was revised from z=10.3 to 11.9, however recent re-analyses suggest it is likely to be at much lower redshift.|
|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|||
|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.|
|Most distant blazar||Q0906+6930||Ursa Major||z=5.47||This is a flat spectrum radio-loud quasar type blazar.|
|Closest BL Lac object||Markarian 421 (Mkn 421, Mrk 421, PKS 1101+384, LEDA 33452)||Ursa Major||z=0.030|||
|Most distant BL Lac object||z=|
|Most distant LINER||z=|
|Most distant LIRG||z=|
|Closest ULIRG||IC 1127 (Arp 220, APG 220)||Serpens Caput||z=0.018|||
|Most distant ULIRG||z=|
|Closest starburst galaxy||Cigar Galaxy (M82, Arp 337/APG 337, 3C 231, Ursa Major A)||Ursa Major||3.2 Mpc|||
|Most distant starburst galaxy||SPT 0243-49||z= 5.698|||
|1||Milky Way Galaxy||0||This is our galaxy, we are part of it.|
|2||Omega Centauri||0.0183 Mly|
|3||Canis Major Dwarf||0.025 Mly|
|4||Virgo Stellar Stream||0.030 Mly|
|5||Sagittarius Dwarf Elliptical Galaxy||0.081 Mly|
|6||Large Magellanic Cloud||0.163 Mly|
|Nearest galaxy||Milky Way||always||0||This is our galaxy|
|Nearest galaxy to our own||Canis Major Dwarf||2003||0.025 Mly|
|Nearest dwarf galaxy||Canis Major Dwarf||2003||0.025 Mly|
|Nearest large 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|
|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||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||This was the first galaxy determined to be not part of the Milky Way.|
- Omega Centauri does not appear on this list because is not currently considered a galaxy, per se, it is considered a former galaxy, and all that remains of one that was cannibalized by the Milky Way.
|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, however recent re-analyses suggest it is likely to be at much lower redshift.|
|Most remote galaxy with spectroscopic redshift||Z8 GND 5296||2013||z=7.51|||
|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|||
|grand-design spiral galaxy||Q2343-BX442||2012||z=2.18|||
|Z8 GND 5296||2013 − 2014||z=7.51|||
|SXDF-NB1006-2||2012 − 2013||z=7.215|||
|GN-108036||2012 − 2012||z=7.213|||
|BDF-3299||2012 − 2013||z=7.109|||
|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.|
|SDF J132522.3+273520||2005 − 2006||z=6.597||This was the remotest object known at time of discovery.|
|SDF J132418.3+271455||2003 − 2005||z=6.578||This was the remotest object known at time of discovery.|
|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|
|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|
|HDF 4-473.0||1998 − 1999||z=5.60||This was the remotest object known at the time of discovery.|
|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.|
|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|
|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.|
|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|
|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.|
|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.|
|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.|
|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.|
|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.|
|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.|
|3C 318||1976 -||0.752||This is a radio galaxy. At the time, the most remote object was quasar OQ172, at z=3.53, found in 1974.|
|3C 411||1975 -||0.469||This is a radio galaxy. At the time, the most remote object was quasar OQ172, at z=3.53, found in 1974.|
|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.|
|LEDA 25177 (MCG+01-23-008)||1951 − 1960||z=0.2
|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).|
|LEDA 51975 (MCG+05-34-069)||1936 -||z=0.13
|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.|
|LEDA 20221 (MCG+06-16-021)||1932 -||z=0.075
|This is the BCG of the Gemini Cluster (ACO 568) and was located at B1950.0 07h 05m 0s +35° 04′|
|BCG of WMH Christie's Leo Cluster||1931 − 1932||z=
|BCG of Baede's Ursa Major Cluster||1930 − 1931||z=
|NGC 4860||1929 − 1930||z=0.026
|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.|
|NGC 584 (Dreyer nebula 584)||1921 − 1929||z=0.006
|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.|
|M104 (NGC 4594)||1913 − 1921||z=0.004
|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.|
|M81||antiquity - 20th century
||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's 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.|
- 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.
- 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.
- 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
- 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
- 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
- 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.
- 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
- From 1964 to 1997, the title of most distant object in the universe was held by a succession of quasars. 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.
Galaxies by brightness and power
|Apparently brightest galaxy||Baby Boom Galaxy||[verification needed]||Starburst galaxy located in the very distant universe.|
|Intrinsically brightest galaxy||Absolute magnitude||Markarian 231 is the most luminous nearby galaxy (~590 Mly; apmag 13.8).|
|Intrinsically faintest galaxy||Boötes Dwarf Galaxy (Boo dSph)||Absolute magnitude -6.75||This does not include dark galaxies.|
|Lowest surface brightness galaxy||Andromeda IX|
|Visually brightest galaxy||Large Magellanic Cloud||Apparent magnitude 0.6||This galaxy has high surface brightness combined with high apparent brightness.|
Galaxies by mass and density
|Least massive galaxy||Segue 2||~150,000 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.|
|Most massive galaxy||ESO 146-IG 005||~30×1012 MSun||Central galaxy in Abell 3827, 1.4 Gly distant.|
|Most dense galaxy||M60-UCD1|| This is an ultra-compact dwarf galaxy near Messier 60, and is suspected to be the stripped core remnant of a much larger galaxy.|
|Least dense galaxy|
|Most massive spiral galaxy||ISOHDFS 27||1.04×1012 MSun||The preceding most massive spiral was UGC 12591|
|Least massive galaxy with globular cluster(s)||Andromeda I|||
|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.|
|The smaller galaxy NGC 5195 is tidally interacting with the larger Whirlpool Galaxy, creating its grand design spiral galaxy architecture.|
|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.|
|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.|
|Arp 299 (NGC 3690 & IC 694)||These two galaxies have recently collided and are now both barred irregular galaxies.|
|Mayall's Object||This is a pair of galaxies, one which punched through the other, resulting in a ring galaxy.|
|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.|
|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.|
|Starfish Galaxy (NGC 6240, IC 4625)||This recently coalesced galaxy still has two prominent nuclei.|
|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 the be core of this dwarf galaxy.|
|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.|
|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
|M82||Ursa Major||Also called the Cigar Galaxy. This is the prototype starburst galaxy.|
|M87||Virgo||This is the central galaxy of the Virgo Cluster, the central cluster of the Local Supercluster|
|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.|
|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).|
|IC 1101||Most expansive galaxy||5–6 million light-years (close to 2 Mpc) across|
|Malin 1||1.1 billion light years||Coma Berenices||Largest spiral galaxy||650,000 light years (200 Kpc) across; first discovered giant low-surface-brightness galaxy|
Objects mistakenly identified as galaxies
|G350.1-0.3||Supernova remnant||Due to its unusual shape, it was originally misidentified as a galaxy.|
Lists of galaxies
- Local Group
- List of nearest galaxies
- List of polar-ring galaxies
- List of spiral galaxies
- List of quasars
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