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The Hα-based star formation rate density of the universe at z=0.84

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2008-04-10
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Villar, Victor
Pascual, Sergio
Noeske, Kai
Koo, David C.
Barro, Guillermo
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American Astronomical Society
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We present the results of an Hα near-infrared narrowband survey searching for star-forming galaxies at redshift z = 0.84. This work is an extension of our previous narrowband studies in the optical at lower redshifts. After removal of stars and redshift interlopers (using spectroscopic and photometric redshifts), we build a complete sample of 165 Hα emitters in the extended Groth strip and GOODS-N fields with L(Hα) > 10^41 ergs s^−1. We compute the Hα luminosity function at z = 0.84 after corrections for [N_π] flux contamination, extinction, systematic errors, and incompleteness. Our sources present an average dust extinction of A(H α) = 1.5 mag. Adopting Hα as a surrogate for the instantaneous SFR, we measure an extinction-corrected SFR density of 0.17^+0.03_−0.03 M_☉ yr^−1 Mpc^−3. Combining this result to our prior measurements at z = 0.02, 0.24, and 0.40, we derive an Hα-based evolution of the SFR density proportional to (1 + z)^β with β = 3.8 ± 0.5. This evolution is consistent with that derived by other authors using different SFR tracers.
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© 2008. The American Astronomical Society. We thank Nicolás Cardiel and Armando Gil de Paz for advice and useful comments. V. V. acknowledges the receipt of a Formación de Personal Investigador Fellowship from the Spanish Ministerio de Educación y Ciencia. This work was supported in part by the Spanish Plan Nacional de Astronomía y Astrofísica under grants AYA2003-01676 and AYA2006-02358. This work was supported in part by a generous grant of the New del Amo Foundation Program.
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