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Photometric properties of Ly alpha emitters at z=4.86 in the COSMOS 2 square degree field | | Y. Shioya
; Y. Taniguchi
; S. S. Sasaki
; T. Nagao
; T. Murayama
; T. Saito
; Y. Ideue
; A. Nakajima
; K. L. Matsuoka
; J. Trump
; N. Z. Scoville
; D. B. Sanders
; B. Mobasher
; H. Aussel
; P. Capak
; J. Kartaltepe
; A. Koekemoer
; C. Carilli
; R. S. Ellis
; B. Garilli
; M. Giavalisco
; M. G. Kitzbichler
; C. Impey
; O. LeFevre
; E. Schinnerer
; V. Smolcic
; | | Date: |
29 Jan 2009 | | Abstract: | We present results of a survey for Ly alpha emitters at z=4.86 based on
optical narrowband (lambda_c=7126 angstrom, Delta lambda=73 angstrom) and
broadband (B, V, r’, i’, and z’) observations of the Cosmic Evolution Survey
(COSMOS) field using Suprime-Cam on the Subaru Telescope. We find 79 LAE
candidates at z=4.86 over a contiguous survey area of 1.83 deg^2, down to the
Ly alpha line flux of 1.47 x 10^-17 ergs s^-1 cm^-2. We obtain the Ly alpha
luminosity function with a best-fit Schechter parameters of log
L^*=42.9^+0.5_-0.3 ergs s^-1 and phi^* = 1.2^+8.0_-1.1 x 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 Ly alpha emitters, we divide the
survey area into nine tiles of 0.5^circ x 0.5^circ each. We find that the
number density varies with a factor of ~ 2 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 0.7^circ x 0.7^circ
each. We conclude that at least 0.5 deg^2 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. | | Source: | arXiv, 0901.4627 | | Services: | Forum | Review | PDF | Favorites | |
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