PGC 29820 | |
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![]() PGC 29820 imaged by the Hubble Space Telescope | |
Observation data (J2000 epoch) | |
Constellation | Sextans |
Right ascension | 10h 13m 46.82s |
Declination | -00d 54m 51.0s |
Redshift | 0.04244 |
Heliocentric radial velocity | 12,723 km/s |
Distance | 600 Mly (183.96 Mpc) |
Group or cluster | Abell 957 |
Apparent magnitude (V) | 0.11 |
Apparent magnitude (B) | 0.15 |
Characteristics | |
Type | Sb(f), Seyfert 2 |
Size | 120,000 ly |
Other designations | |
LEDA 29820, CGCG 008-077, 2dFGRS N288Z210, AGC 500048, NVSS J101346-005449, JO204 |
PGC 29820 (known as JO204) is a spiral galaxy 600 million light-years from the Solar System, in the Sextans constellation. [1] The galaxy is about 120,000 light-years in diameter and is a member of Abell 957, a low-mass galaxy cluster. [2] The first known reference to this galaxy is from volume I of the Catalogue of Galaxies and of Clusters of Galaxies compiled by Fritz Zwicky in 1961, where it was listed as CGCG 008-077. [3]
PGC 29820 is classified a massive galaxy with a stellar mass of M* = 4 x1010 M. [4] It contains an active galactic nucleus with double-peaked narrow lines. [5] [6] Moreover, it is also a Seyfert 2 galaxy. [7]
PGC 29820 is classified a jellyfish galaxy. [8] [9] [10] According to Gullieuszik, the galaxy is currently in a first phrase of infalling into the cluster where it is subjected to ram pressure by the intracluster medium. [2]
Because dense gas is compressed, it eventually collapses to form new stars in both the galaxy's tail and its disk. [4] According to researchers, the stars inside the tail, has a star formation rate of 0.22 M○ yr1 [11] which began during the last 500 million years. [2]
In additional, PGC 29820 shows a large presence of molecular gas making up H2 mass of 8.3 x 109 M○. Looking at ratio of total molecular hydrogen mass and stellar mass, it is estimated as 0.42. [12]