The luminosity function and star formation rate between redshifts of 0.07 and 1.47 for narrowband emitters in the subaru deep field

Chun Ly, Matt A. Malkan, Nobunari Kashikawa, Kazuhiro Shimasaku, Mamoru Doi, Tohru Nagao, Masanori Iye, Tadayuki Kodama, Tomoki Morokuma, Kentaro Motohara

Research output: Contribution to journalArticlepeer-review

144 Citations (Scopus)

Abstract

SDF line-emitting galaxies in four narrowband filters at low and intermediate redshifts are presented. Broadband colors, follow-up optical spectroscopy, and multiple NB filters are used to distinguish Hα, [O II], and [O III] emitters at z = 0.07-1.47 to construct their LFs. These LFs are derived down to faint magnitudes, allowing for an accurate determination of the faint-end slope. With a large (N ∼ 200-900) sample for each redshift interval, a Schechter profile is fitted to each LF. Prior to dust extinction corrections, the [O III] and [O II] LFs agree reasonably well with those of Hippelein et al. The z = 0.08 Ha LF, which reaches 2 orders of magnitude fainter than Gallego et al., is steeper by 25%. This indicates that there are more low-luminosity star-forming galaxies for z < 0.1. The faint-end slope α and Φ*, show a strong redshift evolution, while L * shows little evolution. The evolution in α indicates that low-luminosity galaxies have a stronger evolution compared to brighter ones. Integrated SFR densities are derived via Hα, [O III], and [O III] for 0.07 < z < 1.47. A steep increase in the SFR density, as a function of redshift, is seen for 0.4 < z < 0.9. For z > 1, the SFR densities are similar. The latter is consistent with previous UVand [O II] measurements. Below z < 0.4, the SFR densities are consistent with several Ha, [O II], and UV measurements, but others are a factor of 2 higher. For example, the z = 0.066-0.092 LF agrees with Jones & Bland-Hawthorn, but at z = 0.24 and 0.40, their number densities are twice as high. This discrepancy can be explained by cosmic variance.

Original languageEnglish
Pages (from-to)738-759
Number of pages22
JournalAstrophysical Journal
Volume657
Issue number2 I
DOIs
Publication statusPublished - 2007 Mar 10
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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