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The [OII]3727 Luminosity function and Star Formation Rate at z~1.2 in the COSMOS 2 Square-degree Field and the Subaru Deep Field

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arxiv astro-ph/0703065 v1 pith:QNANBDYW submitted 2007-03-04 astro-ph

M. I. Takahashi , Y. Shioya , Y. Taniguchi , T. Murayama , M. Ajiki , S. S. Sasaki , O. Koizumi , T. Nagao
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N. Z. Scoville B. Mobasher H. Aussel P. Capak C. Carilli R. S. Ellis B. Garilli M. Giavalisco L. Guzzo G. Hasinger C. Impey M. G. Kitzbichler A. Koekemoer O. Le Fevre S. J. Lilly D. Maccagni A. Renzini M. Rich D. B. Sanders E. Schinnerer M. Scodeggio P. Shopbell V. Smolcic S. Tribiano Y. Ideue S. Mihara
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We have carried out a wide-field imaging survey for [OII]3727 emitting galaxies at z~1.2 in the HST COSMOS 2 square degree field using the Suprime-Cam on the Subaru Telescope. The survey covers a sky area of 6700 arcmin^2 in the COSMOS field, and a redshift range between 1.17 and 1.20 (Delta_z = 0.03), corresponding to a survey volume of 5.56*10^5 Mpc^3. We obtain a sample of 3176 [OII] emitting galaxies with observed emission-line equivalent widths greater than 26 AA. Since our survey tends to sample brighter [OII]3727 emitting galaxies, we also analyze a sample of fainter [OII]3727 emitting galaxies found in the Subaru Deep Field (SDF). We find an extinction-corrected [OII] luminosity density of 10^{40.35^+0.08_-0.06} ergs s^-1 Mpc-3, corresponding to star formation rate density of 0.32^+0.06_-0.04 M_sun yr-1 Mpc^-3 in the COSMOS field at z~1.2. This is the largest survey for [OII]3727 emitters beyond z=1 currently available.

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