Hydra Cluster Explained

Hydra Cluster
Constellation:	Hydra
Epoch:	J2000
Ra:	^[1]
Redshift:	0.0548 (16,452 km/s)
Distance:	58.3Mpc
Richness:	1^[2]
Bmtype:	III
Member No:	157^[3]
Flux:	6.1 erg s^−1 cm^−2 (0.5–2 keV)
Other Names:	Abell 1060

The Hydra Cluster (or Abell 1060) is a galaxy cluster that contains 157 bright galaxies, appearing in the constellation Hydra.^[4] The cluster spans about ten million light-years and has an unusually high proportion of dark matter.^[5] The cluster is part of the Hydra–Centaurus Supercluster located 158 million light-years from Earth. The cluster's largest galaxies are elliptical galaxies NGC 3309 and NGC 3311 and the spiral galaxy NGC 3312 all having a diameter of about 150,000 light-years.^[6] In spite of a nearly circular appearance on the sky, there is evidence in the galaxy velocities for a clumpy, three-dimensional distribution.^[7]

Related reading

• Wehner, Elizabeth M. H. and Harris, William E. (10 August 2006) UCD candidates in the Hydra Cluster . ArXiv.org. ApL Letters

Notes and References

1. Web site: NASA/IPAC Extragalactic Database . Results for Abell 2151 . 13 June 2013.
2. Abell . George O. . George O. Abell . 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 . PDF . 0067-0049 . 1989ApJS...70....1A . 10.1086/191333 . 12 March 2012 . free .
3. Web site: National Optical Astronomy Observatory . Galaxies . 19 July 2007 . 15 March 2016 . https://web.archive.org/web/20160315035450/http://noao.edu/image_gallery/html/im0658.html . dead .
4. Wehner and Harris, p.1
5. 16 April 2001 . The Hydra Cluster of Galaxies .
6. http://www.atlasoftheuniverse.com/superc/hya.html The Hydra Supercluster
7. 10.1086/166902 . Fitchett . Michael . Merritt . David . David Merritt . Dynamics of the Hydra I Galaxy Cluster . The Astrophysical Journal . December 1988 . 335 . 18–34 . 1988ApJ...335...18F. free .