The Hα luminosity function and star formation rate at z ≈ 0.24 based on Subaru Deep imaging data

Shinobu S. Fujita, Masaru Ajiki, Yasuhiro Shioya, Tohru Nagao, Takashi Murayama, Yoshiaki Taniguchi, Kazuyoshi Umeda, Sanae Yamada, Masafumi Yagi, Sadanori Okamura, Yutaka Komiyama

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

We have carried out a deep imaging survey for Hα-emitting galaxies at z ≈ 0.24 using a narrowband filter tuned with the redshifted line. The total sky area covered is 706 arcmin2 within a redshift range from 0.234 to 0.252 (δz = 0.018). This corresponds to a volume of 3.9 × 103 Mpc3 when Ωmatter = 0.3, ΩΛ = 0.7, and H0 = 70 km s-1 Mpc-1 are adopted. We obtain a sample of 348 Hα-emitting galaxies whose observed emission-line equivalent widths are greater than 12 Å. We find an extinction-corrected Hα luminosity density of 1039.65+0.08-0.12 ergs s-1 Mpc-3. Using the Kennicutt relation between the Hα luminosity and the star formation rate, the star formation rate density in the covered volume is estimated to be 0.036-0.012+0.006 M yr-1 Mpc-3. This value is higher by a factor of 3 than the local star formation rate density.

Original languageEnglish
Pages (from-to)L115-L118
JournalAstrophysical Journal
Volume586
Issue number2 II
DOIs
Publication statusPublished - 2003 Apr 1

Keywords

  • Galaxies: distances and redshifts
  • Galaxies: evolution
  • Galaxies: luminosity function, mass function

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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