| IOK-1 | |
|---|---|
 IOK-1 by the Subaru Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Coma Berenices |
| Right ascension | 13 23 59.8 |
| Declination | +27° 24′ 56″ |
| Redshift | 6.964 |
| Distance | 12.88 billion light-years (3.95 Gpc) |
| Apparent magnitude (V) | 24.4 |
| Characteristics | |
| Type | LAE |
| Size | 4,000 ly (1,200 pc) (diameter) 2,000 ly (610 pc) (radius) |
| Apparent size (V) | 0.001 x 0.001 |
| Other designations | |
| JEM2013 62, OIK2017 NB973-SDF-85821, OMS2009 SDF-63544 | |
IOK-1 is a distant galaxy in the constellation Coma Berenices. When discovered in 2006, it was the oldest and most distant galaxy ever found, at redshift 6.96.
It was discovered in April 2006 by Masanori Iye at National Astronomical Observatory of Japan using the Subaru Telescope in Hawaii and is seen as it was 12.88 billion years ago. Its emission of Lyman alpha radiation has a redshift of 6.96, corresponding to just 750 million years after the Big Bang. While some scientists have claimed other objects (such as Abell 1835 IR1916) to be even older, the IOK-1's age and composition have been more reliably established.
"IOK" stands for the observers' names Iye, Ota, and Kashikawa.
See also
References
- ^ "IOK 1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-07-31.
- Hogan, Jenny (2006), "Journey to the birth of the Universe", Nature, 443 (7108): 128–129, Bibcode:2006Natur.443..128H, doi:10.1038/443128a, PMID 16971914
- Iye, Masanori; Ota, Kazuaki; Kashikawa, Nobunari; Furusawa, Hisanori; Hashimoto, Tetsuya; Hattori, Takashi; Matsuda, Yuichi; Morokuma, Tomoki; Ouchi, Masami; et al. (2006), "A galaxy at a redshift z = 6.96", Nature, 443 (7108): 186–188, arXiv:astro-ph/0609393v1, Bibcode:2006Natur.443..186I, doi:10.1038/nature05104, PMID 16971942, S2CID 2876103
- Press release, National Astronomical Observatory of Japan, September 13, 2006
| Preceded bySDF J132522.3+273520 | Most distant astronomical object 2006–2009 |
Succeeded byGRB 090423 |
| Preceded bySDF J132522.3+273520 | Most distant galaxy 2006–2011 |
Succeeded byBDF-3299 |
