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| EGSY8p7 EGSY-2008532660 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major/Boötes |
| Right ascension | 14h 20m 08.50s |
| Declination | +52° 53′ 26.60″ |
| Redshift | 8.683+0.001 −0.004[1] |
| Heliocentric radial velocity | 2,603,098 km/s (1,617,490 mi/s) |
| Galactocentric velocity | 2,603,221 km/s (1,617,567 mi/s) |
| Distance | 13.2 billion ly (4.0 billion pc) (light travel distance) 30.5 billion ly (9.4 billion pc) (comoving distance) |
| Apparent magnitude (V) | 25.3 |
| Characteristics | |
| Size | 32000 ly |
| Other designations | |
| EGSY8p7,[2] EGS8p7[3] | |
EGSY8p7 (EGSY-2008532660) is a distant galaxy in the constellation of Boötes, with a spectroscopic redshift of z = 8.68 (photometric redshift 8.57), a light travel distance of 13.2 billion light-years from Earth. Therefore, at an age of 13.2 billion years, it is observed as it existed 570 million years after the Big Bang, which occurred 13.8 billion years ago, using the W. M. Keck Observatory.[4] In July 2015, EGSY8p7 was announced as the oldest and most-distant known object, surpassing the previous record holder, EGS-zs8-1, which was determined in May 2015 as the oldest and most distant object. In March 2016, Pascal Oesch, one of the discoverers of EGSY8p7, announced the discovery of GN-z11, an older and more distant galaxy.[5]
The galaxy contains a supermassive black hole, CEERS 1019.
- ^ Adi Zitrin; Ivo Labbe; Sirio Belli; Rychard Bouwens; Richard S. Ellis; Guido Roberts-Borsani; Daniel P. Stark; Pascal A. Oesch; Renske Smit (2015). "Lyman-alpha Emission from a Luminous z = 8.68 Galaxy: Implications for Galaxies as Tracers of Cosmic Reionization". The Astrophysical Journal. 810 (1): L12. arXiv:1507.02679. Bibcode:2015ApJ...810L..12Z. doi:10.1088/2041-8205/810/1/L12. S2CID 11524667.
- ^ Cite error: The named reference
AstronomyNow-2015-08-06was invoked but never defined (see the help page). - ^ Cite error: The named reference
Caltech-2015-09-03was invoked but never defined (see the help page). - ^ "New Record: Keck Observatory Measures Most Distant Galaxy". W. M. Keck Observatory. Archived from the original on 15 August 2015. Retrieved 12 January 2022.
- ^ Amos, Jonathan (March 3, 2016). "Hubble sets new cosmic distance record". BBC News. Retrieved March 3, 2016.