A Subaru search for Lyα emitters at redshift 5.7

Masaru Ajiki, Yoshiaki Taniguchi, Shinobu S. Fujita, Yasuhiro Shioyo, Tohru Nagao, Takashi Murayama, Sanae Yamada, Kazuyoshi Umeda, Yutaka Komiyama

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91 Citations (Scopus)


We present the results of a survey for Lyα emitters at z ≈ 5.7 based on optical narrowband (λ c = 8150 Å and Δλ = 120 Å) and broadband (B, R C, I C and z′) observations of the field surrounding the high-redshift quasar SDSSp J104433.04-012522.2 with the 8.2 m Subaru Telescope using the Subaru prime-focus camera, Suprime-Cam. This survey covers a sky area of ≈ 720 arcmin 2 and a comoving volume of ≃ 2 × 7 10 5 10 5 h 0.7 -3 Mpc 3. We have found 20 candidate Lyα emitters at z ≈ 5.7 with Δz ≈ 0.1. Two of them have been confirmed as star-forming galaxies at z = 5.655 and z = 5.687 from our follow-up optical spectroscopy. We discuss the star formation properties of the 20 objects from a statistical point of view. Our survey leads to a new estimate of the star formation rate density at z ≈ 5.7, ∼1.2 × 10 -3 h 0.7 M yr -1 Mpc -3.

Original languageEnglish
Pages (from-to)2091-2107
Number of pages17
JournalAstronomical Journal
Issue number5 1775
Publication statusPublished - 2003 Nov


  • Cosmology: observations
  • Early universe
  • Galaxies: evolution
  • Galaxies: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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