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On contamination and completeness in z≥ 5 Lyman-break galaxy surveys

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Stanway, Elizabeth R., Bremer, M. N. (Malcolm N.) and Lehnert, M. D. (Matthew D.). (2008) On contamination and completeness in z≥ 5 Lyman-break galaxy surveys. Monthly Notices of the Royal Astronomical Society, Vol.385 (No.1). pp. 493-510. ISSN 0035-8711

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Abstract

A large population of z > 5 Lyman-break galaxies has been identified in recent years. However, the high-redshift galaxies selected by different surveys are subject to a variety of selection effects – some overt, others more subtle. We present an analysis of sample completeness and contamination issues in high-redshift surveys, focusing on surveys at z≈ 5 and using a spectroscopically confirmed low-redshift sample from the DEEP2 survey in order to characterize contaminant galaxies. We find that most surveys underestimate their contamination from highly clustered galaxies at z≈ 1 and stars. We consider the consequences of this for both the rest-frame ultraviolet luminosity function and the clustering signal from z≈ 5 galaxies. We also find that sources with moderate strength Lyman α emission lines can be omitted from dropout surveys due to their blue colours, again effecting the derived luminosity functions. We discuss the points of comparison between different samples, and the applicability of survey-specific results to the population at z > 5 in general.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Stars -- Luminosity function, Red shift, Galaxies -- Evolution, Photometry
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Date: 2008
Volume: Vol.385
Number: No.1
Page Range: pp. 493-510
Identification Number: 10.1111/j.1365-2966.2008.12853.x
Status: Peer Reviewed
Publication Status: Published
Funder: Science and Technology Facilities Council (Great Britain) (STFC)
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URI: http://wrap.warwick.ac.uk/id/eprint/40096

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