IC 21

Last updated
IC 21
IC21 - SDSS DR14.jpg
Observation data
Constellation Cetus
Redshift 0.060818
Heliocentric radial velocity 18233 km/s
Distance 822 Mly
Characteristics
Type SBbc
Size120,000 ly (estimated)
Other designations
PGC 1785, MCG+00-02-053, LEDA 1785, 2MASX J00291043-0009490

IC 21 known as PGC 1785, is a distant barred spiral galaxy located in the Cetus constellation. [1] It is located 822 million light-years away and has an estimated diameter of 120,000 light-years. [2] IC 21 was first found by Stephane Javelle, who was a French astronomer on November 7th in 1891. [3] The galaxy is apparently located near towards a dwarf galaxy, PGC 3112047. [3] According to SIMBAD database, IC 21 is both a Seyfert type 2 and radio galaxy, suggesting an active galactic nucleus. [4]

Related Research Articles

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<span class="mw-page-title-main">PGC 54493</span> Galaxy in the constellation Serpens

PGC 54493 is a barred spiral galaxy located about 490 million light-years away in the constellation Serpens. It is part of a galaxy group called Abell 2052. It has an estimated diameter of 140,000 light-years.

<span class="mw-page-title-main">NGC 493</span> Galaxy in the constellation Cetus

NGC 493, also occasionally referred to as PGC 4979 or GC 281, is a barred spiral galaxy in the constellation Cetus. It is located approximately 90 million light-years from Earth and was discovered on December 20, 1786 by astronomer William Herschel. It was later also observed by his son, John Herschel. John Dreyer, creator of the New General Catalogue, described the galaxy as "very faint, large, much extended 60°" with "a little brighter middle".

<span class="mw-page-title-main">NGC 521</span> Spiral galaxy in the constellation Cetus

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<span class="mw-page-title-main">NGC 1356</span> Galaxy in the constellation Horologium

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<span class="mw-page-title-main">NGC 3110</span> Galaxy in the constellation Sextans

NGC 3110, known as NGC 3122 and NGC 3518 is an active spiral galaxy in the Constellation Sextans. It contains extensive Hubble-type Sb star-forming regions, and is located south of the celestial equator. It is estimated to be 218 million light-years from the Milky Way and has a diameter of around 100,000 ly. Together with PGC 29184 it forms a gravitationally bound galaxy pair. Located in the same area of the sky is the galaxy IC 589.

<span class="mw-page-title-main">IC 4271</span> Spiral galaxy located in constellation Canes Venatici

IC 4271 is a spiral galaxy located some 800 million light-years away in the Canes Venatici constellation. It is 130,000 light-years in diameter. IC 4271 was first located on July 10, 1896, by Stephane Javelle, a French astronomer. It hosts a Seyfert type 2 nucleus, containing an acceleration disc around its supermassive black hole which releases large amounts of radiation, hence its bright appearance. IC 4271 appears to be interacting with its smaller neighboring galaxy, PGC 3096774.

<span class="mw-page-title-main">NGC 945</span> Galaxy in the constellation Cetus

NGC 945 is a barred spiral galaxy in the constellation Cetus. It is located south of the celestial equator. It is estimated to be 200 million light-years from the Milky Way and about 135,000 light-years in diameter. Together with NGC 948, it forms a gravitationally bound pair of galaxies. In the same area of the sky there are, among other things: the galaxies NGC 942, NGC 943, NGC 950, IC 230. The Type Ib supernova SN 1998dt was observed here. The object was discovered by astronomer William Herschel on November 28, 1785. It is within close proximity to NGC 948.

<span class="mw-page-title-main">PGC 29820</span> Galaxy located in the constellation Sextans

PGC 29820 is a spiral galaxy located 600 million light-years away from the solar system in the Sextans constellation. It is about 120,000 thousand light-years in diameter and has high amounts of star formation rates. The reason is due to the ram pressure, which enables the dense gas to be compressed which eventually collapses to form new stars. Not only to mention, the galaxy's tendrils are also created, hence astronomers calling it a jellyfish galaxy. According to SIMBAD, it is classified as a Seyfert 2 galaxy which it contains an active nucleus.

<span class="mw-page-title-main">PGC 65543</span> Galaxy located in the constellation Indus

PGC 65543, is a spiral galaxy, with extensive star forming regions, located in Indus. It is 650 million light-years away from the solar system and approximately measuring 90,000 light-years in diameter. The tidal interactions from certain galaxies which PGC 65543 is moving towards to, have caused it to get distorted. Its star-forming gas and dust are dynamically stripped and formed into tendrils that stretch outwards, thus gives an appearance of a jellyfish galaxy.

<span class="mw-page-title-main">PGC 1228197</span> Galaxy located in the constellation Aquarius

PGC 1228197 known as WINGS J211347.41+022834.9 and JO206, is a large spiral galaxy located 700 million light-years away towards the constellation of Aquarius. The galaxy is estimated to be at least 160,000 thousand light-years in diameter, making it somehow bigger than the Milky Way. With a radial velocity of 15,200 kilometers per second, it is slowly drifting away. It is classified as a jellyfish galaxy, mainly due to interactions from other galaxies, causing it to run into intracluster medium and stripping the gas from it, which causes long galactic tendrils of stars. It has an active galactic nucleus according to SIMBAD.

<span class="mw-page-title-main">PGC 4789</span> Spiral galaxy in the constellation Pisces

PGC 4789 is a distant barred spiral galaxy in the Pisces constellation. It is located 675 million light-years from the Milky Way and seems to be interacting with its neighboring galaxies. it is known as Arp 48 in the Atlas of Peculiar Galaxies catalogue. In this class, PGC 4789 falls into galaxies that have at least one low surface brightness companion.

<span class="mw-page-title-main">IC 42</span>

IC 42 known as PGC 2463 and PGC 911417, is a barred spiral galaxy located in the constellation of Cetus. It is about 750 million light-years away from the solar system and has an estimated diameter of 145,000 light-years, making it bigger compared to the Milky Way galaxy. It was first found by Stephane Javelle, a French astronomer on August 25, 1892. According to SIMBAD, it is considered as an emission-line galaxy.

<span class="mw-page-title-main">PGC 2456</span> Galaxy in the constellation Cetus

PGC 2456 known as KAZ 364 and JO201, is a spiral galaxy located in the constellation of Cetus. A member of Abell 85 galaxy cluster, it is located 617 million light-years away from the solar system and is considered a jellyfish galaxy due to the fact the tendrils are seen drifting downwards from its core. This mainly occurs when such galaxies like PGC 2456, moves through high speeds across the galaxy clusters, causing ram pressure to stripped gas, thus forming tendrils full of star formation. It is listed as a Seyfert galaxy by SIMBAD, meaning it has an active galactic nucleus. PGC 2456 lies 360 kiloparsecs from the brightest cluster galaxy, Holmberg 15A.

<span class="mw-page-title-main">IC 5337</span> Galaxy in the constellation Pegasus

IC 5337 or JW100, is a spiral galaxy located 800 million light-years away from the solar system in the constellation of Pegasus. It is probably gravitationally bound to IC 5338, the brightest cluster galaxy in Abell 2626. IC 5337 is a jellyfish galaxy, mainly due to dynamic stripping pressure. Star-forming gas are thrown about, as the galaxy penetrates through the thin gas layer and causing them to drip from the galaxy's disc, giving it its unique appearance of a cosmic jellyfish. In the image, other galaxies can be seen in the background.

<span class="mw-page-title-main">NGC 5008</span> Galaxy in the constellation Boötes

NGC 5008 is a massive barred spiral galaxy located in the Boötes constellation.

<span class="mw-page-title-main">IC 3246</span> Galaxy in the constellation Virgo

IC 3246 known as PGC 40202, is a barred spiral galaxy with a ring located in the Virgo constellation. It is situated 1.13 billion light-years away from the Solar System and was discovered by Friedrich Karl Arnold Schwassmann on September 14, 1900. IC 3246 has a surface brightness of 23.6 magnitude/arc seconds and located at right ascension and declination respectively.

<span class="mw-page-title-main">IC 3789</span> Galaxy in the constellation Coma Berenices

IC 3789, occasionally known as PGC 1619535, is a type Sbc barred spiral galaxy in the Coma Berenices constellation. It is located 872 million light-years away from the solar system and has an approximate diameter of 150,000 light-years making it slightly larger than the Milky Way. IC 3789 was discovered on 27 January 1904 by astronomer Max Wolf.

<span class="mw-page-title-main">IC 1166</span> Pair of galaxies in Corona Borealis

IC 1166 are a pair of galaxies in the Corona Borealis constellation comprising IC 1166 NED01 and IC 1166 NED02. They are located 977 million light-years from the solar system and were discovered on July 28, 1892, by Stephane Javelle.

<span class="mw-page-title-main">NGC 3754</span>

NGC 3754 is a small barred spiral galaxy located in Leo. It is located 447 million light-years away from the Solar System and was discovered on April 5, 1874, by Ralph Copeland.

References

  1. "IC 21 - Barred Spiral Galaxy in Cetus | TheSkyLive.com". theskylive.com. Retrieved 2024-04-17.
  2. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-04-17.
  3. 1 2 "Index Catalog Objects: IC 1 - 49". cseligman.com. Retrieved 2024-04-17.
  4. "IC 21". simbad.u-strasbg.fr. Retrieved 2024-04-17.