|
| | | | |
| | | |
| Stat |
Members: 3644
Articles: 2'497'992
Articles rated: 2609
16 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Spectroscopic confirmation of an ultra-faint galaxy at the epoch of reionization | | Austin Hoag
; Maruša Bradač
; Michele Trenti
; Tommaso Treu
; Kasper B. Schmidt
; Kuang-Han Huang
; Brian C. Lemaux
; Julie He
; Stephanie R. Bernard
; Louis E. Abramson
; Charlotte A. Mason
; Takahiro Morishita
; Laura Pentericci
; Tim Schrabback
; | | Date: |
10 Apr 2017 | | Abstract: | Within one billion years of the Big Bang, intergalactic hydrogen was ionized
by sources emitting ultraviolet and higher energy photons. This was the final
phenomenon to globally affect all the baryons (visible matter) in the Universe.
It is referred to as cosmic reionization and is an integral component of
cosmology. It is broadly expected that intrinsically faint galaxies were the
primary ionizing sources due to their abundance in this epoch. However, at the
highest redshifts ($z>7.5$; lookback time 13.1 Gyr), all galaxies with
spectroscopic confirmations to date are intrinsically bright and, therefore,
not necessarily representative of the general population. Here, we report the
unequivocal spectroscopic detection of a low luminosity galaxy at $z>7.5$. We
detected the Lyman-$alpha$ emission line at $sim 10504$ {AA} in two separate
observations with MOSFIRE on the Keck I Telescope and independently with the
Hubble Space Telescope’s slit-less grism spectrograph, implying a source
redshift of $z = 7.640 pm 0.001$. The galaxy is gravitationally magnified by
the massive galaxy cluster MACS J1423.8+2404 ($z = 0.545$), with an estimated
intrinsic luminosity of $M_{AB} = -19.6 pm 0.2$ mag and a stellar mass of
$M_{star} = 3.0^{+1.5}_{-0.8} imes 10^8$ solar masses. Both are an order of
magnitude lower than the four other Lyman-$alpha$ emitters currently known at
$z > 7.5$, making it probably the most distant representative source of
reionization found to date. | | Source: | arXiv, 1704.2970 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER