MACS 1423-z7p64
| MACS 1423-z7p64 | |
|---|---|
| Observation data (J2000epoch) | |
| Constellation | Boötes |
| Right ascension | 14h23m46.177s[1] |
| Declination | 24° 4m10.758s[1] |
| Redshift | 7.640 ± 0.001[1] |
| Heliocentric radial velocity | 2,287,417 km/s (1,421,335 mi/s) |
| Galactocentric velocity | 2,287,467 km/s (1,421,366 mi/s) |
| Distance | 13.1billionly(4.0 billionpc) (light travel distance) ≈30billionly(9.2 billionpc) (comoving distance) |
| Other designations | |
| [HBT2017] MACS1423-z7p64, [STB2016] Anc 01567 | |
MACS 1423-z7p64is agalaxylisted in theMAssive Cluster Survey (MACS),and announced on 10 April 2017 in the journalNature Astronomy,[1]as being the most distant source ofreionizationknown at this time, with aredshiftz = 7.640 ± 0.001 (lookback time >13.1 Gyr).[1]
Discovery
[edit]MACS 1423-z7p64 was discovered throughgravitational lensingbyMACS J1423.8+2404(z = 0.545), a cluster that magnified its brightness by a factor of 10. To identify the galaxy, the astronomers used the slitlessgrismspectrographof the Wide Field Infrared Survey Telescope on theHubble Space Telescope,and to determine its distance theMulti-Object Spectrometer for Infra-Red Exploration (MOSFIRE)detector of theKeck Observatory.[1][2]
Nature received the paper on 27 October 2016.)[1]
Importance
[edit]With a redshift z = 7.640 ± 0.001, and being anorder of magnitudelower in intensity than the four other Lyman-α emitters currently known at z > 7.5, it is probably the most distant representative source of reionization found to date.[1]This is from a time when the universe was around 700 million years old.[2]
References
[edit]- ^abcdefghHoag, Austin; Bradač, Maruša; Trenti, Michele; Treu, Tommaso; Schmidt, Kasper B; Huang, Kuang-Han; Lemaux, Brian C; He, Julie; Bernard, Stephanie R; Abramson, Louis E; Mason, Charlotte A; Morishita, Takahiro; Pentericci, Laura; Schrabback, Tim (2017). "Spectroscopic confirmation of an ultra-faint galaxy at the epoch of reionization".Nature Astronomy.1(5): 0091.arXiv:1704.02970.Bibcode:2017NatAs...1E..91H.doi:10.1038/s41550-017-0091.S2CID119448863.
- ^ab"Astronomers detect ultra-faint galaxy from the very early universe]author=Weule, Genelle".ABC News Online.2017-04-11.