Photometric properties of Lyα 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. 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. GarilliM. Giavalisco, M. G. Kitzbichler, C. Impey, O. Lefevre, E. Schinnerer, V. Smolcic

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


We present results of a survey for Lyα emitters at z ≈ 4.86 based on optical narrowband (λc = 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 -17erg s-1 cm-2. We obtain the Lyα luminosity function with a best-fit Schechter parameters of logL * = 42.9+0.5-0.3 erg s-1 and φ* = 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 0°5 × 0°5 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 × 0°7 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.

Original languageEnglish
Pages (from-to)546-561
Number of pages16
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 2009 May 1


  • Galaxies: distances and redshifts
  • Galaxies: evolution
  • Galaxies: luminosity function
  • Mass function


Dive into the research topics of 'Photometric properties of Lyα emitters at z ≈ 4.86 in the cosmos 2 square degree field'. Together they form a unique fingerprint.

Cite this