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19 April 2024

» arxiv » 0709.1009

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The H$alpha$ Luminosity Function and Star Formation Rate at $z approx 0.24$ in the Cosmos 2 Square-Degree Field
Y. Shioya ; Y. Taniguchi ; S. S. Sasaki ; T. Nagao ; T. Murayama ; M. I. Takahashi ; M. Ajiki ; Y. Ideue ; S. Mihara ; A. Nakajima ; N. Z. Scoville ; B. Mobasher ; H. Aussel ; M. Giavalisco ; L. Guzzo ; G. Hasinger ; C. Impey ; O. LeFevre ; S. Lilly ; A. Renzini ; M. Rich ; D. B. Sanders ; E. Schinnerer ; P. Shopbell ; A. Leauthaud ; J.-P. Kneib ; J. Rhodes ; R. Massey ;
Date:	7 Sep 2007
Abstract:	To derive a new H$alpha$ luminosity function and to understand the clustering properties of star-forming galaxies at $z approx 0.24$, we have made a narrow-band imaging survey for H$alpha$ emitting galaxies in the HST COSMOS 2 square degree field. We used the narrow-band filter NB816 ($lambda_c = 8150$ AA, $Delta lambda = 120$ AA) and sampled H$alpha$ emitters with $EW_{ m obs}( m Halpha + [N extsc{ii}]) > 12$ AA in a redshift range between $z=0.233$ and $z=0.251$ corresponding to a depth of 70 Mpc. We obtained 980 H$alpha$ emitting galaxies in a sky area of 5540 arcmin$^2$, corresponding to a survey volume of $3.1 imes 10^4 { m Mpc^3}$. We derive a H$alpha$ luminosity function with a best-fit Schechter function parameter set of $alpha = -1.35^{+0.11}_{-0.13}$, $logphi_* = -2.65^{+0.27}_{-0.38}$, and $log L_* ({ m erg s^{-1}}) = 41.94^{+0.38}_{-0.23}$. The H$alpha$ luminosity density is $2.7^{+0.7}_{-0.6} imes 10^{39}$ ergs s$^{-1}$ Mpc$^{-3}$. After subtracting the AGN contribution (15 %) to the H$alpha$ luminosity density, the star formation rate density is evaluated as $1.8^{+0.7}_{-0.4} imes 10^{-2}$ $M_{sun}$ yr$^{-1}$ Mpc$^{-3}$. The angular two-point correlation function of H$alpha$ emitting galaxies of $log L({ m Halpha}) > 39.8$ is well fit by a power law form of $w( heta) = 0.013^{+0.002}_{-0.001} heta^{-0.88 pm 0.03}$, corresponding to the correlation function of $xi(r) = (r/1.9{ m Mpc})^{-1.88}$. We also find that the H$alpha$ emitters with higher H$alpha$ luminosity are more strongly clustered than those with lower luminosity.
Source:	arXiv, 0709.1009
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