Back Antlia-sterrestelselswerm Afrikaans عنقود أنتاليا المجري Arabic Cúmul de la Màquina Pneumàtica Catalan Antlia-Galaxienhaufen German Σύμπλεγμα της Αντλίας Greek Cúmulo de Antlia Spanish Ilmapumpun galaksijoukko Finnish Amas de la Machine pneumatique French Ammasso della Macchina Pneumatica Italian 공기펌프자리 은하단 Korean

Antlia Cluster

Antlia Cluster
Observation data (Epoch J2000)
Constellation(s)Antlia
Right ascension10h 30m 03.5s[1]
Declination−35° 19′ 24″[1]
Brightest memberNGC 3268, NGC 3258
Number of galaxies254
Richness class0[2]
Bautz–Morgan classificationI-II[2]
Velocity dispersion444–591 km/s[3]
Redshift0.0087[4]
Distance40.7 Mpc (132.7 Mly)[5]
ICM temperature~2.0 keV[4]
Binding mass~3.3×1014[3] M☉
X-ray luminosity3.4×1042 h75−2 erg/s (0.5-10.0 keV)[4]
Other designations
Abell S0636

The Antlia Cluster (or Abell 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]

  1. ^ a b "NASA/IPAC Extragalactic Database". Results for NGC 7424. Archived from the original on 16 December 2008. Retrieved 26 Nov 2008.
  2. ^ a b Abell, George O.; Corwin, Harold G. Jr.; Olowin, Ronald P. (May 1989). "A catalog of rich clusters of galaxies". Astrophysical Journal Supplement Series. 70 (May 1989): 1–138. Bibcode:1989ApJS...70....1A. doi:10.1086/191333. ISSN 0067-0049.
  3. ^ a b c Hopp, U.; Materne, J. (July 1985). "The Antlia cluster of galaxies and its environment - The Hydra I-Centaurus supercluster". Astronomy and Astrophysics Supplement Series. 61: 93–106. Bibcode:1985A&AS...61...93H. ISSN 0365-0138.
  4. ^ a b c d e f g h Nakazawa, Kazuhiro; Makishima, Kazuo; Fukazawa, Yasushi; Tamura, Takayuki (August 2000). "ASCA Observations of a Near-by Cluster in Antlia". Publications of the Astronomical Society of Japan. 52 (4). Tokyo, Japan: PASJ: 623–630. Bibcode:2000PASJ...52..623N. doi:10.1093/pasj/52.4.623.
  5. ^ a b c d e f g Dirsch, B.; Richtler, T.; Bassino, L. P. (September 2003). "The globular cluster systems of NGC 3258 and NGC 3268 in the Antlia cluster". Astronomy and Astrophysics. 408 (3): 929–939. arXiv:astro-ph/0307200. Bibcode:2003A&A...408..929D. doi:10.1051/0004-6361:20031027. S2CID 763415.
  6. ^ Smith Castelli, Analía V.; Bassino, Lilia P.; Richtler, Tom; Cellone, Sergio A.; Aruta, Cristian; Infante, Leopoldo (June 2008). "Galaxy populations in the Antlia cluster - I. Photometric properties of early-type galaxies". Monthly Notices of the Royal Astronomical Society. 386 (4): 2311–2322. arXiv:0803.1630. Bibcode:2008MNRAS.386.2311S. doi:10.1111/j.1365-2966.2008.13211.x. S2CID 9042703.
  7. ^ a b Smith Castelli, A. V.; Bassino, L. P.; Cellone, S. A.; Richtler, T.; Dirsch, B.; Infante, L.; Aruta, C.; Gómez, M. (December 2005). "Dwarf Galaxies in the Antlia Cluster: First Results". In I. Saviane; V.D. Ivanov; J. Borissova (eds.). Groups of Galaxies in the Nearby Universe. Proceedings of the ESO Workshop. Vol. ESO ASTROPHYSICS SYMPOSIA. Springer-Verlag (2007). p. 109. arXiv:astro-ph/0603391. Bibcode:2007ggnu.conf..109S. doi:10.1007/978-3-540-71173-5_17. ISBN 978-3-540-71172-8.
  8. ^ Guthrie, B. N. G. (July 1974). "Radio emission associated with the brightest galaxies in clusters". Monthly Notices of the Royal Astronomical Society. 168. MNRAS: 15–20. Bibcode:1974MNRAS.168...15G. doi:10.1093/mnras/168.1.15. A&AA ID: AAA012.160.002.

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