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Lyα Emission from High-redshift Sources in COSMOS

Mallery, Ryan P. and Mobasher, Bahram and Capak, Peter and Kakazu, Yuko and Masters, Dan and Ilbert, Olivier and Hemmati, Shoubaneh and Scarlata, Claudia and Salvato, Mara and McCracken, Henry and Le Fèvre, Olivier and Scoville, Nick (2012) Lyα Emission from High-redshift Sources in COSMOS. Astrophysical Journal, 760 (2). Art. No. 128. ISSN 0004-637X. doi:10.1088/0004-637X/760/2/128.

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We investigate spectroscopically measured Lyα equivalent widths (EWs) and escape fractions of 244 sources of which 95 are Lyman break galaxies (LBGs) and 106 Lyman alpha emitters (LAEs) at z ~ 4.2, z ~ 4.8, and z ~ 5.6 selected from intermediate and narrowband observations. The sources were selected from the Cosmic Evolution Survey and observed with the DEIMOS spectrograph. We find that the distribution of EWs shows no evolution with redshift for both the LBG selected sources and the intermediate/narrowband LAEs. We also find that the Lyα escape fraction of intermediate/narrowband LAEs is on average higher and has a larger variation than the escape fraction of LBG selected sources. The escape fraction does not show a dependence with redshift. Similar to what has been found for LAEs at low redshifts, the sources with the highest extinctions show the lowest escape fractions. The range of escape fractions increases with decreasing extinction. This is evidence that the dust extinction is the most important factor affecting the escape of Lyα photons, but at low extinctions other factors, such as the H I covering fraction and gas kinematics, can be just as effective at inhibiting the escape of Lyα photons.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Capak, Peter0000-0003-3578-6843
Masters, Dan0000-0001-5382-6138
Ilbert, Olivier0000-0002-7303-4397
Hemmati, Shoubaneh0000-0003-2226-5395
Scarlata, Claudia0000-0002-9136-8876
Salvato, Mara0000-0001-7116-9303
McCracken, Henry0000-0002-9489-7765
Le Fèvre, Olivier0000-0001-5891-2596
Scoville, Nick0000-0002-0438-3323
Additional Information:© 2012 American Astronomical Society. Received 2011 August 30; accepted 2012 August 24; published 2012 November 16. Based in part on data obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and NASA and was made possible by the generous financial support of the W. M. Keck Foundation.
Group:COSMOS, Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:galaxies: evolution; galaxies: high-redshift; galaxies: ISM
Issue or Number:2
Record Number:CaltechAUTHORS:20121219-153314783
Persistent URL:
Official Citation:Lyα Emission from High-redshift Sources in COSMOS Ryan P. Mallery, Bahram Mobasher, Peter Capak, Yuko Kakazu, Dan Masters, Olivier Ilbert, Shoubaneh Hemmati, Claudia Scarlata, Mara Salvato, Henry McCracken, Olivier LeFevre, and Nick Scoville doi:10.1088/0004-637X/760/2/128
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36061
Deposited On:19 Dec 2012 23:46
Last Modified:09 Nov 2021 23:19

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