Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/28645
Title: | A Metal-poor Damped Lyα System at Redshift 6.4 | Authors: | Bañados, Eduardo Rauch, Michael DECARLI, ROBERTO Farina, Emanuele P. Hennawi, Joseph F. Mazzucchelli, Chiara Venemans, Bram P. Walter, Fabian Simcoe, Robert A. Prochaska, J. Xavier Cooper, Thomas Davies, Frederick B. Chen, Shi-Fan S. |
Issue Date: | 2019 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 885 | Issue: | 1 | First Page: | 59 | Abstract: | We identify a strong Lyα damping wing profile in the spectrum of the quasar P183+05 at z = 6.4386. Given the detection of several narrow metal absorption lines at z = 6.40392, the most likely explanation for the absorption profile is that it is due to a damped Lyα system. However, in order to match the data a contribution of an intergalactic medium 5%-38% neutral or additional weaker absorbers near the quasar is also required. The absorption system presented here is the most distant damped Lyα system currently known. We estimate an H I column density of 10<SUP>20.68±0.25</SUP> cm<SUP>-2</SUP>, metallicity [O/H] = -2.92 ± 0.32, and relative chemical abundances of a system consistent with a low-mass galaxy during the first Gyr of the universe. This object is among the most metal-poor damped Lyα systems known and, even though it is observed only ∼850 Myr after the big bang, its relative abundances do not show signatures of chemical enrichment by Population III stars. | URI: | http://hdl.handle.net/20.500.12386/28645 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ab4129 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ab4129 | Bibcode ADS: | 2019ApJ...885...59B | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Bañados_2019_ApJ_885_59.pdf | Pdf editoriale | 6.16 MB | Adobe PDF | View/Open |
Page view(s)
35
checked on Apr 24, 2024
Download(s)
11
checked on Apr 24, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.