10h30m03.5s, −35° 19′24″| Antlia Cluster | |
|---|---|
 | |
| Observation data (Epoch J2000) | |
| Constellation(s) | Antlia |
| Right ascension | 10h30m 03.5s[1] |
| Declination | −35° 19′ 24″[1] |
| Brightest member | NGC 3268, NGC 3258 |
| Number of galaxies | 254 |
| Richness class | 0[2] |
| Bautz–Morgan classification | I-II[2] |
| Velocity dispersion | 444–591 km/s[3] |
| Redshift | 0.0087[4] |
| Distance | 40.7 Mpc (132.7 Mly)[5] |
| ICM temperature | ~2.0 keV[4] |
| Binding mass | ~3.3×1014[3] M☉ |
| X-ray luminosity | 3.4×1042 h75−2 erg/s (0.5-10.0 keV)[4] |
| Other designations | |
| Abell S0636 | |
| See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters | |
The Antlia Cluster (orAbell S0636)[4] is a cluster of galaxies located in the Hydra–Centaurus Supercluster. The Antlia Cluster is the third-nearest to the Local Group after the Virgo Cluster and Fornax Cluster.[6] Antlia's distance from Earth is 40.5 megaparsecs (132.1 megalight-years) to 40.9 Mpc (133.4 Mly)[5] and can be viewed from Earth in the constellation Antlia.[5][7] The Antlia Cluster should not be confused with the Antlia Dwarf galaxy.[5]
Antlia is classified as a rare Bautz–Morgan type III cluster,[4][3] meaning it has no central dominant (cD) brightest cluster galaxy.[8] However, the cluster is dominated by two massive elliptical galaxies, NGC 3268 and NGC 3258, and contains a total of about 234 galaxies.[4][5] The cluster is very dense compared to other clusters such as Virgo and Fornax, thus containing early-type galaxies and a larger portion of dwarf ellipticals.[5][7][clarification needed] The cluster is split into two galaxy groups, the Northern subgroup gravitating around NGC 3268, and the Southern subgroup centered on NGC 3258.[5]
The cluster has an overall redshift of z = 0.0087, implying that the cluster is, like most objects in the Universe, receding from the Local Group.[4] Using the now-obsolete scientific satellite ASCA, X-ray observations show that the cluster is almost isothermal, with a mean temperature of kT ~ 2.0 keV.[4]
