Antlia Cluster
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| Virgo Cluster | |
| Observation data (Epoch ) | |
|---|---|
| Constellation(s) | Antlia |
| Right ascension | 10h 27m 60s |
| Declination | -35° 15′ 00″ |
| Number of galaxies | 254 |
| Brightest member | NGC 3268, NGC 3258 |
| Other designations | |
| Abell S636 | |
| See also: Galaxy groups and clusters, List of galaxy clusters | |
The Antlia Cluster (or Abell S636) [1] is a cluster of galaxies located in the Hydra-Centaurus Supercluster. The Antlia Cluster is the third nearest to our Local Group after the Virgo Cluster and Fornax Cluster. The cluster's distance from earth is 32.58 - 32.71 Mly [2] away and can be viewed from earth in the Constellation Antlia. [3] The Antlia Cluster should not be confused with the Antlia Dwarf Galaxy. [2]
The cluster is classified, as a rare Bautz-morgan type III cluster [4], meaning the cluster has no dominating Giant diffuse galaxy (cD). [5] Although, this cluster is dominated by two massive elliptical galaxies, NGC 3268 and NGC 3258, the cluster has about 234 galaxies in total. [6] 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. [7] The Cluster is split into two groups, The Northern subgroup gravitating around NGC 3268, and the Southern subgroup centered around NGC 3258. [2]
The cluster has an overall redshift of z = 0.0087, implying the cluster like most objects in the universe are expanding away from our Local group and others.[1] Using the now obsolete scientific satellite ASCA , X-ray observations show the cluster is almost isothermal, with a mean temperature of kT ~ 2.0 keV.[1]
Antila Galaxies: NGC 3267, NGC 3568, NGC 3258, NGC 3269, NGC 3271[1]
[edit] Notes
- ^ a b c d Nakazawa, Makishima, Fukazawa, and Tamura, p.623-630
- ^ a b c Dirsch, Richtler, and Bassino pp.1-12
- ^ Castelli, Bassino, Cellone, Richtler, Dirsch, Infante, Auruta, and Gomez, p.1; Dirsch, Richtler, and Bassino p.1
- ^ Hopp and Materne, p.93; Nakazawa, Makishima, Fukazawa, and Tamura, p.1
- ^ Guthrie, p.15
- ^ Dirsch, Richtler, and Bassino p.1; Nakazawa; Makishima; Fukazawa; and Tamura, p.624
- ^ Castelli, Bassino, Cellone, Richtler, Dirsch, Infante, Auruta, and Gomez p.1; Dirsch, Richtler, and Bassino p.1
[edit] References
- Burnham Jr., Robert (1978) Burham's Celestial Handbook Revised Edition Vol. 1 of 3. Dover Publications. New York ISBN 0-486-240630
- Castelli, Bassino, Cellone, Richtler, Dirsch, Infante, Auruta, and Gomez (2006) Dwarf galaxies in the Antlia Cluster: First results. ArXiv.org.
- Dirsch, Richtler, and Bassino (2003) The Globular Cluster Systems of NGC 3258 and NGC 3268 in the Antlia Cluster. ArXiv.org. Astronomy & Astrophysics manuscript no. h4465
- Guthrie, B. N. G. (1974) Radio emission associated with the brightest galaxies in clusters. Monthly Notices of the Royal Astronomical Society, Vol. 168, p. 15-20
- Hopp, U. and Materne, J. (1985) The Antlia Cluster of Galaxies and its Environment: The Hydra I-Centarus Supercluster. Astronomy and Astrophysics Supplement Series vol. 61, July 1985, p. 93-106
- Nakazawa, K.; Makishima, K.; Fukazawa, Y.; and Tamura, T. (2000) ASCA Observations of a Near-by Cluster in Antlia . Publications of the Astronomical Society of Japan, Vol.52
