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Title:
The Hα Luminosity Function and Star Formation Rate at z ~ 0.24 in the COSMOS 2 Square Degree Field
Authors:
Shioya, Y.; Taniguchi, Y.; Sasaki, S. S.; Nagao, T.; Murayama, T.; Takahashi, M. I.; Ajiki, M.; Ideue, Y.; Mihara, S.; Nakajima, A.; Scoville, N. Z.; Mobasher, B.; Aussel, H.; Giavalisco, M.; Guzzo, L.; Hasinger, G.; Impey, C.; Le Fèvre, O.; Lilly, S.; Renzini, A.; Rich, M.; Sanders, D. B.; Schinnerer, E.; Shopbell, P.; Leauthaud, A.; Kneib, J.-P.; Rhodes, J.; Massey, R.
Affiliation:
AA(Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho, Matsuyama 790-8577, Japan.), AB(Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho, Matsuyama 790-8577, Japan.), AC(Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama 790-8577, Japan.; Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.; Department of Astronomy, MS 105-24, California Institute of Technology, Pasadena, CA 91125.), AD(National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan.), AE(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AF(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AG(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AH(Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama 790-8577, Japan.), AI(Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama 790-8577, Japan.), AJ(Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama 790-8577, Japan.), AK(Department of Astronomy, MS 105-24, California Institute of Technology, Pasadena, CA 91125.; Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822.), AL(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AM(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822.; CEA Saclay, DSM/DAPNIA/SAp, 91191 Gif-sur-Yvette Cedex, France.), AN(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AO(Osservatorio Astronomico di Brera, via Brera, Milan, Italy.), AP(Max-Planck-Institut für Extraterrestrische Physik, D-85478 Garching, Germany.), AQ(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AR(Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille Cedex 12, France.), AS(Department of Physics, Swiss Federal Institute of Technology (ETH-Zurich), CH-8093 Zurich, Switzerland.), AT(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany.), AU(Department of Physics and Astronomy, University of California, Los Angeles, CA 90095.), AV(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822.), AW(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany.), AX(Department of Astronomy, MS 105-24, California Institute of Technology, Pasadena, CA 91125.), AY(Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille Cedex 12, France.), AZ(Department of Astronomy, MS 105-24, California Institute of Technology, Pasadena, CA 91125.; Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille Cedex 12, France.), BA(Department of Astronomy, MS 105-24, California Institute of Technology, Pasadena, CA 91125.), BB(Department of Astronomy, MS 105-24, California Institute of Technology, Pasadena, CA 91125.; Jet Propulsion Laboratory, Pasadena, CA 91109.)
Publication:
The Astrophysical Journal Supplement Series, Volume 175, Issue 1, pp. 128-137. (ApJS Homepage)
Publication Date:
03/2008
Origin:
UCP
ApJ Keywords:
Galaxies: Distances and Redshifts, Galaxies: Evolution, Galaxies: Luminosity Function, Mass Function
DOI:
10.1086/523703
Bibliographic Code:
2008ApJS..175..128S

Abstract

To derive a new Hα luminosity function and to understand the clustering properties of star-forming galaxies at z~0.24, we have made a narrowband imaging survey for Hα-emitting galaxies in the Hubble Space Telescope (HST) COSMOS 2 square degree field. We used the narrowband filter NB816 (λc=8150 Å, Δλ=120 Å) and sampled Hα emitters with EWobs(Hα+[N II])>12 Å in a redshift range between z=0.233 and 0.251 corresponding to a depth of 70 Mpc. We obtained 980 Hα-emitting galaxies in a sky area of 5540 arcmin2, corresponding to a survey volume of 3.1×104 Mpc3. We derive a Hα luminosity function with a best-fit Schechter function parameter set of α=-1.35+0.11-0.13, logφ*=-2.65+0.27-0.38, and logL*(ergs s-1)=41.94+0.38-0.23. The Hα luminosity density is 2.7+0.7-0.6×1039 ergs s-1 Mpc-3. After subtracting the AGN contribution (15%) to the Hα luminosity density, the star formation rate density is evaluated as 1.8+0.7-0.4×10-2 Msolar yr-1 Mpc-3. The angular two-point correlation function of Hα-emitting galaxies of logL(Hα)>39.8 is well fit by a power-law form of w(θ)=0.013+0.002-0.001θ-0.88+/-0.03, corresponding to the correlation function of ξ(r)=(r/1.9 Mpc)-1.88. We also find that the Hα emitters with higher Hα luminosity are more strongly clustered than those with lower luminosity.

Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.


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