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Title:
Star-Forming Galaxies at z approx 0.24 in the Subaru Deep Field and the Sloan Digital Sky Survey
Authors:
Morioka, Taichi; Nakajima, Aki; Taniguchi, Yoshiaki; Shioya, Yasuhiro; Murayama, Takashi; Sasaki, Shunji S.
Affiliation:
AA(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578; Nikkei Home Publishing Inc., Akasaka, Minato-ku, Tokyo 107-8406) AB(Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama, Ehime 790-8577) AC(Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho, Matsuyama, Ehime 790-8577) AD(Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho, Matsuyama, Ehime 790-8577; ) AE(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578) AF(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578; Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama, Ehime 790-8577)
Publication:
Publications of the Astronomical Society of Japan, Vol.60, No.6, pp.1219--1229 (PASJ Homepage)
Publication Date:
12/2008
Origin:
PASJ
Keywords:
galaxies: distances and redshifts, galaxies: evolution, galaxies: luminosity function, mass function
Bibliographic Code:
2008PASJ...60.1219M

Abstract

We made a search for Hα emitting galaxies at z approx 0.24 in the Subaru Deep Field (SDF) using an archival data set obtained with the Subaru telescope. We carefully selected Hα emitters in the narrow-band filter NB816, using B, V, RC, i', and z' broad-band colors. We obtained a sample of 258 emitting galaxies with observed equivalent widths of (Hα + [NII]6548,6584) greater than 12Å. We also analyzed a sample of Hα emitters taken from the Sloan Digital Sky Survey (SDSS) to constrain the luminous end of the Hα luminosity function. Using the same selection criteria as those for the SDF, and after excluding AGNs, we obtained 317 Hα emitting star-forming galaxies. Combining these two samples of Hα emitters found in both SDF and SDSS, we derived an Hα luminosity function with best-fit Schechter function parameters of α = ‑1.31+0.17‑0.17, log φ* = ‑2.46+0.34‑0.40 Mpc‑3, and log L* = 41.99+0.08‑0.07 ergs s‑1. The extinction-corrected Hα luminosity density is 4.45+2.96‑1.75×1039 ergs s‑1Mpc‑3. Using the Kennicutt relation between the Hα luminosity and star-formation rate, the star-formation rate density in the survey volume was estimated at 0.035+0.024‑0.014Modot yr‑1Mpc‑3. The angular two-point correlation function of Hα emitters over 875 arcmin2 at z = 0.24 was well-fitted by a power-law form with w(θ) = 0.047+0.017‑0.013θ‑0.66±0.08, corresponding to the correlation function ξ(r) = [r / (2.6+1.0‑0.8 Mpc]‑1.66±0.08. The small correlation length of Hα emitters may imply a weak clustering of active star-forming galaxies.
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