MACS 1423-z7p64

MACS 1423-z7p64 is a galaxy listed in the MAssive Cluster Survey (MACS), and announced on 10 April 2017 in the journal Nature Astronomy,[1] as being the most distant source of reionization known at this time, with a redshift z = 7.640 ± 0.001 (lookback time >13.1 Gyr).[1]

MACS 1423-z7p64
Observation data (J2000 epoch)
ConstellationBoötes
Right ascension14h 23m 46.177s[1]
Declination24° 4m 10.758s[1]
Redshift7.640 ± 0.001[1]

Discovery

MACS 1423-z7p64 was discovered through gravitational lensing by MACS 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 slitless grism spectrograph of the Wide Field Infrared Survey Telescope on the Hubble Space Telescope, and to determine its distance the Multi-Object Spectrometer for Infra-Red Exploration (MOSFIRE) detector of the Keck Observatory.[1][2]

Nature received the paper on 27 October 2016.)[1]

Importance

With a redshift z = 7.640 ± 0.001, and being an order of magnitude lower 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
  1. Hoag, 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.
  2. "Astronomers detect ultra-faint galaxy from the very early universe]author=Weule, Genelle". ABC News Online. 2017-04-11.
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