HCM-6A
| HCM-6A | |
|---|---|
| Observation data (J2000 epoch) | |
| Constellation | Cetus |
| Right ascension | 02h 39m 54.7s |
| Declination | −01° 33′ 32″ |
| Redshift | 6.56 |
| Distance | 12.8 billion light years |
HCM-6A is a galaxy that was found in 2002 by a team led by Esther Hu from the University of Hawaii, using the Keck II Telescope in Hawaii. HCM-6A is located behind the Abell 370 galactic cluster, near M77 [1] in the constellation Cetus, which enabled the astronomers to use Abell 370 as a gravitational lens to get a clearer image of the object.[2][3]
HCM-6A was the farthest object known at the time of its discovery. It exceeded SSA22−HCM1 (z = 5.74) as the most distant normal galaxy known, and quasar SDSSp J103027.10+052455.0 (z = 6.28) as the most distant object known. In 2003, SDF J132418.3+271455 (z = 6.578) was discovered, and took over the title of most remote object known, most remote galaxy known, and most remote normal galaxy known.
References
- ^ Halton Arp and David Russell (2001). "A Possible Relationship between Quasars and Clusters of Galaxies". The Astrophysical Journal. 549 (2): 802–819. Bibcode:2001ApJ...549..802A. doi:10.1086/319438.
- ^ E. M. Hu; et al. (2001). "A Redshift z = 6.56 Galaxy behind the Cluster Abell 370". The Astrophysical Journal Letters. 568 (2): L75–L79. arXiv:astro-ph/0203091. Bibcode:2002ApJ...568L..75H. doi:10.1086/340424.
{{cite journal}}: Unknown parameter|author-separator=ignored (help) - ^ Press release, National Astronomical Observatory of Japan, September 13, 2006
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