Photometric Properties of Lyα Emitters at z ≈ 4.86 in the COSMOS 2 Square Degree Field

Shioya, Y. and Taniguchi, Y. and Sasaki, S. and Nagao, T. and Murayama, T. and Saito, T. and Ideue, Y. and Nakajima, A. and Matsuoka, K. and Trump, J. and Scoville, N. Z. and Sanders, D. B. and Mobasher, B. and Aussel, H. and Capak, P. and Kartaltepe, J. and Koekemoer, A. and Carilli, C. and Ellis, R. S. and Garilli, B. and Giavalisco, M. and Kitzbichler, M. G. and Impey, C. and LeFevre, O. and Schinnerer, E. and Smolčić, Vernesa (2009) Photometric Properties of Lyα Emitters at z ≈ 4.86 in the COSMOS 2 Square Degree Field. Astrophysical Journal, 696 (1). pp. 546-561. ISSN 0004-637X

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Abstract

We present results of a survey for Lyα emitters at z ≈ 4.86 based on optical narrowband (λ c = 7126 Å, Δλ = 73 Å) and broadband (B, V, r', i', and z') observations of the Cosmic Evolution Survey field using Suprime-Cam on the Subaru Telescope. We find 79 Lyα emitter (LAE) candidates at z ≈ 4.86 over a contiguous survey area of 1.83 deg2, down to the Lyα line flux of 1.47 × 10-17 erg s-1 cm-2. We obtain the Lyα luminosity function with a best-fit Schechter parameters of log L* = 42.9+0.5 -0.3 erg s-1 and phi* = 1.2+8.0 -1.1 × 10-4 Mpc-3 for α = -1.5 (fixed). The two-point correlation function for our LAE sample is ξ(r) = (r/4.4+5.7 -2.9 Mpc)-1.90±0.22. In order to investigate the field-to-field variations of the properties of Lyα emitters, we divide the survey area into nine tiles of 0fdg5 × 0fdg5 each. We find that the number density varies with a factor of sime2 from field to field with high statistical significance. However, we find no significant field-to-field variance when we divide the field into four tiles with 0fdg7 × 0fdg7 each. We conclude that at least 0.5 deg2 survey area is required to derive averaged properties of LAEs at z ~ 5, and our survey field is wide enough to overcome the cosmic variance.

Item Type: Article
Keywords: galaxies: distances and redshifts, galaxies: evolution, galaxies: luminosity function, mass function
Date: 2009
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © 2009 American Astronomical Society. Received 2008 August 8; accepted for publication 2009 February 2; published 2009 April 16.
Divisions: Faculty of Science > Department of Physics
Publisher: IOP Publishing
Depositing User: Vernesa Smolčić
Date Deposited: 21 Apr 2015 19:32
Last Modified: 22 Apr 2015 14:09
URI: http://digre.pmf.unizg.hr/id/eprint/3854

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