Global star formation rate density over 0.7 < z < 1.9

Hyunjin Shim, James Colbert, Harry Teplitz, Alaina Henry, Mattew Malkan, Patrick McCarthy, Lin Yan

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Abstract

We determine the global star formation rate (SFR) density at 0.7 < z < 1.9 using emission-line-selected galaxies identified in Hubble Space Telescope-Near Infrared Camera and Multi-Object Spectrograph (HST-NICMOS) grism spectroscopy observations. Observing in a pure parallel mode throughout HST Cycles 12 and 13, our survey covers ∼104 arcmin2 from which we select 80 galaxies with likely redshifted Hα emission lines. In several cases, a somewhat weaker [OIII] doublet emission is also detected. The Hα luminosity range of the emission-line galaxy sample is 4.4 × 10 41 < L(Hα) < 1.5 × 1043 erg s -1. In this range, the luminosity function is well described by a Schechter function with φ* = (4.24 ± 3.55) × 10-3 Mpc-3, L* = (2.88 ± 1.58) × 1042 erg s-1, and α = -1.39 ± 0.43. We derive a volume-averaged SFR density of 0.138 ± 0.058 M yr-1 Mpc-3 at z = 1.4 without an extinction correction. Subdividing the redshift range, we find SFR densities of 0.088 ± 0.056 M yr-1 Mpc-3 at z = 1.1 and 0.265 ± 0.174 M yr-1 Mpc-3 at z = 1.6. The overall star formation rate density is consistent with previous studies using Hα when the same average extinction correction is applied, confirming that the cosmic peak of star formation occurs at z > 1.5.

Original languageEnglish
Pages (from-to)785-796
Number of pages12
JournalAstrophysical Journal
Volume696
Issue number1
DOIs
StatePublished - 1 May 2009

Keywords

  • Galaxies: evolution
  • Galaxies: high-redshift
  • Galaxies: luminosity function, mass function
  • Galaxies: starburst

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