Coma Cluster

Not to be confused with Coma Star Cluster.
Coma Cluster
Coma cluster of galaxies photographed by an amateur
Observation data (Epoch J2000)
Constellation(s)Coma Berenices
Right ascension12h 59m 48.7s[1]
Declination+27° 58′ 50″[1]
Brightest memberNGC 4874 and NGC 4889
Number of galaxies> 1000[2][3]
Richness class2[4]
Bautz–Morgan classificationII[4]
Velocity dispersion1,000 km/s[5]
Redshift0.0231 (6 925 km/s)[1]
Distance102.975 Mpc (336 Mly) for h−1
0.705[1]
ICM temperature8-9 keV[6]
Binding mass~7×1014[7] M☉
X-ray flux(319.20 ± 2.6%)×10−12 erg s−1 cm−2[1] (0.1-2.4 keV)[1]
Other designations
Abell 1656[1]

The Coma Cluster (Abell 1656) is a large cluster of galaxies that contains over 1,000 identified galaxies.[2][3] Along with the Leo Cluster (Abell 1367), it is one of the two major clusters comprising the Coma Supercluster.[8] It is located in and takes its name from the constellation Coma Berenices.

The cluster's mean distance from Earth is 99 Mpc (321 million light years).[3][9][10] Its ten brightest spiral galaxies have apparent magnitudes of 12–14 that are observable with amateur telescopes larger than 20 cm.[11] The central region is dominated by two supergiant elliptical galaxies: NGC 4874 and NGC 4889.[12] The cluster is within a few degrees of the north galactic pole on the sky. Most of the galaxies that inhabit the central portion of the Coma Cluster are ellipticals. Both dwarf and giant ellipticals are found in abundance in the Coma Cluster.[13]

  1. ^ a b c d e f g "NASA/IPAC Extragalactic Database". Results for Abell 1656. Retrieved 2006-09-19.
  2. ^ a b "Chandra/Field Guide to X-ray Sources". Coma Cluster. Archived from the original on April 21, 2008. Retrieved 2008-06-16.
  3. ^ a b c "NASA / Focus on the Coma Cluster". Archived from the original on 2008-05-30. Retrieved 2008-06-16.
  4. ^ 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.
  5. ^ Struble, Mitchell F.; Rood, Herbert J. (November 1999). "A Compilation of Redshifts and Velocity Dispersions for ACO Clusters". The Astrophysical Journal Supplement Series. 125 (1). Chicago, Illinois, USA: The University of Chicago Press: 35–71. Bibcode:1999ApJS..125...35S. doi:10.1086/313274.
  6. ^ Section 4 of Sato, Takuya; Matsushita, Kyoko; Ota, Naomi; Sato, Kosuke; Nakazawa, Kazuhiro; Sarazin, Craig L. (November 2011). "Suzaku Observations of Iron K-Lines from the Intracluster Medium of the Coma Cluster" (PDF). Publications of the Astronomical Society of Japan. 63 (SP3): S991–S1007. arXiv:1109.0154. Bibcode:2011PASJ...63S.991S. doi:10.1093/pasj/63.sp3.s991. Retrieved March 12, 2012.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  7. ^ Gavazzi, R.; Adami, C.; Durret, F.; Cuillandre, J.-C.; Ilbert, O.; Mazure, A.; Pelló, R.; Ulmer, M.P. (May 2009). "A weak lensing study of the Coma cluster". Astronomy and Astrophysics. 498 (2): L33–L36. arXiv:0904.0220. Bibcode:2009A&A...498L..33G. doi:10.1051/0004-6361/200911841. S2CID 15418452.
  8. ^ "The Coma Supercluster".
  9. ^ "2MASS Atlas Image Gallery: Galaxy Groups and Clusters". Infrared Processing and Analysis Center. Retrieved 2010-05-02.
  10. ^ Colless, M (2001). "Coma Cluster". In P Murdin (ed.). Encyclopedia of Astronomy and Astrophysics. Bristol Institute of Physics publishing. Retrieved 2006-10-08.[permanent dead link]
  11. ^ Singapore Science Centre. "ScienceNet - Astronomy & Space Science - Observatories/ Telescopes - Question No. 13490". Archived from the original on 2005-11-11. Retrieved 2012-02-25.
  12. ^ Conselice, Christopher J., Gallagher, John S., III (1998). "Galaxy aggregates in the Coma cluster". Monthly Notices of the Royal Astronomical Society. 297 (2): L34–L38. arXiv:astro-ph/9801160. Bibcode:1998MNRAS.297L..34C. doi:10.1046/j.1365-8711.1998.01717.x. S2CID 14908115.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  13. ^ Newswise: Hubble's Sweeping View of the Coma Cluster of Galaxies Retrieved on June 11, 2008.