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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448279.0, MPI für Astronomie / Publikationen_mpia
Photometric properties of Lyα emitters at z = 4.86 in the COSMOS 2 Square Degree Field
Authors:Shioya, Y.; Taniguchi, Y.; Sasaki, S. S.; Nagao, T.; Murayama, T.; Saito, T.; Ideue, Y.; Nakajima, A.; Matsuoka, K.; Trump, J.; Scoville, N. Z.; Sanders, D. B.; Mobasher, B.; Aussel, H.; Capak, P.; Kartaltepe, J.; Koekemoer, A.; Carilli, C.; Ellis, R. S.; Garilli, B.; Giavalisco, M.; Kitzbichler, M. G.; Impey, C.; LeFevre, O.; Schinnerer, E.; Smolcic, V.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Issue / Number:1
Start Page:546
End Page:561
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present results of a survey for Lyalpha emitters at z ≈ 4.86 based on optical narrowband (lambda c = 7126 Å, Deltalambda = 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 Lyalpha emitter (LAE) candidates at z ≈ 4.86 over a contiguous survey area of 1.83 deg2, down to the Lyalpha line flux of 1.47 × 10--17 erg s-1 cm--2. We obtain the Lyalpha 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 alpha = --1.5 (fixed). The two-point correlation function for our LAE sample is xi(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 Lyalpha 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. Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
Free Keywords:galaxies: distances and redshifts; galaxies: evolution; galaxies: luminosity function; mass function
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009ApJ...696..546S [ID No:1]
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