A search for Lyα emitters at redshift 3.7

Shinobu S. Fujita, Masaru Ajiki, Yasuhiro Shioya, Tohru Nagao, Takashi Murayama, Yoshiaki Taniguchi, Sadanori Okamura, Masami Ouchi, Kazuhiro Shimasaku, Mamoru Doi, Hisanori Furusawa, Masaru Hamabe, Masahiko Kimura, Yutaka Komiyama, Masayuki Miyazaki, Satoshi Miyazaki, Fumiaki Nakata, Maki Sekiguchi, Masafumi Yagi, Naoki YasudaYuichl Matsuda, Hajime Tamura, Tomoki Hayashino, Keiichi Kodaira, Hlroshi Karoji, Toru Yamada, Koujl Ohta, Masayuki Umemura

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


We present the results of a survey for emission-line objects, based on optical intermediate-band (λc = 5736 Å and ΔλA = 280 Å) and broadband (B, V, R, and i′) observations of the Subaru/XMM-Newton Deep Field with the 8.2 m Subaru telescope and the Subaru Prime Focus Camera (Suprime-Cam). All the data were obtained during the guaranteed time observations of the Suprime-Cam instrument. The intermediate-band image covered a sky area of 10′.62 × 12′.40 ≈ 132 arcmin2 in the Subaru/XMM-Newton Deep Field (Ouchi et al.). Using this image, we found 23 emission-line sources whose observed emission-line equivalent widths are greater than 250 Å. Their optical multicolor properties indicate that six emission-line sources are Lyα emitters at z ≈ 3.7 (Δz ≈ 0.22). They are either intense starburst galaxies or active galactic nuclei-like quasars at z ≈ 3.7. Two more emission-line sources may also be Lyα emitters at z ≈ 3.7, although their multicolor properties are marginal. Among the remaining 15 emission-line objects, eight objects appear to be strong emission-line galaxies at lower redshift; e.g., [O II] λ3727 emitters at z ≈ 0.54, Hβ at z ≈ 0.18, or [O III] λ5007 emitters at z ≈ 0.15. The remaining seven objects are unclassified because they are too faint to be detected in broadband images. We discuss the observational properties of these strong emission-line sources. In particular, our data allow us to estimate the star formation density at z ≈ 3.7 for the first time.

Original languageEnglish
Pages (from-to)13-31
Number of pages19
JournalAstronomical Journal
Issue number1 1765
Publication statusPublished - 2003 Jan
Externally publishedYes


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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