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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29665
Title: Keck/MOSFIRE Spectroscopy of z = 7-8 Galaxies: Lyα Emission from a Galaxy at z = 7.66
Authors: Song, Mimi
Finkelstein, Steven L.
Livermore, Rachael C.
Capak, Peter L.
DICKINSON, MARK
FONTANA, Adriano 
Issue Date: 2016
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 826
Issue: 2
First Page: 113
Abstract: We report the results from some of the deepest Keck/Multi-Object Spectrometer For Infra-Red Exploration data yet obtained for candidate z ≳ 7 galaxies. Our data show one significant line detection with 6.5σ significance in our combined 10 hr of integration which is independently detected on more than one night, thus ruling out the possibility that the detection is spurious. The asymmetric line profile and non-detection in the optical bands strongly imply that the detected line is Lyα emission from a galaxy at z(Lyα) = 7.6637 ± 0.0011, making it the fourth spectroscopically confirmed galaxy via Lyα at z > 7.5. This galaxy is bright in the rest-frame ultraviolet (UV; M <SUB>UV</SUB> ∼ -21.2) with a moderately blue UV slope (β =-{2.2}<SUB>-0.2</SUB><SUP>+0.3</SUP>), and exhibits a rest-frame Lyα equivalent width of EW(Lyα) ∼ {15.6}<SUB>-3.6</SUB><SUP>+5.9</SUP> Å. The non-detection of the 11 other z ∼ 7-8 galaxies in our long 10 hr integration, reaching a median 5σ sensitivity of 28 Å in the rest-frame EW(Lyα), implies a 1.3σ deviation from the null hypothesis of a non-evolving distribution in the rest-frame EW(Lyα) between 3 < z < 6 and z = 7-8. Our results are consistent with previous studies finding a decline in Lyα emission at z > 6.5, which may signal the evolving neutral fraction in the intergalactic medium at the end of the reionization epoch, although our weak evidence suggests the need for a larger statistical sample to allow for a more robust conclusion.
URI: http://hdl.handle.net/20.500.12386/29665
URL: https://iopscience.iop.org/article/10.3847/0004-637X/826/2/113
ISSN: 0004-637X
DOI: 10.3847/0004-637X/826/2/113
Bibcode ADS: 2016ApJ...826..113S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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