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    Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version A. A. Khostovan, D. Sobral, B. Mobasher, P. N. Best, I. Smail, J. P. Stott, S. Hemmati, and H. Nayyeri Evolution of the H β + [O III] and [O II] luminosity functions and the [O II] star formation history of the Universe up to z ∼ 5 from HiZELS MNRAS (October 01, 2015) Vol. 452 3948-3968 doi:10.1093/mnras/stv1474 First published online August 10, 2015 is available online at: http://mnras.oxfordjournals.org/content/452/4/3948

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Evolution of the Hβ + [O III] and [OII] luminosity functions and the [O II] star formation history of the universe up to z ~ 5 from HiZELS

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<mark>Journal publication date</mark>1/10/2015
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number4
Volume452
Number of pages21
Pages (from-to)3948-3968
Publication StatusPublished
Early online date10/08/15
<mark>Original language</mark>English

Abstract

We investigate the evolution of the Hβ + [O III] and [O II] luminosity functions from z ~ 0.8 to ~5 in four redshift slices per emission line using data from the High-z Emission Line Survey (HiZELS). This is the first time that the Hβ + [O III] and [O II] luminosity functions have been studied at these redshifts in a self-consistent analysis. This is also the largest sample of [O II] and Hβ + [O III] emitters (3475 and 3298 emitters, respectively) in this redshift range, with large comoving volumes ~1 × 10<sup>6</sup> Mpc<sup>-3</sup> in two independent volumes (COSMOS and UDS), greatly reducing the effects of cosmic variance. The emitters were selected by a combination of photometric redshift and colour-colour selections, as well as spectroscopic follow-up, including recent spectroscopic observations using DEIMOS and MOSFIRE on the Keck Telescopes and FMOS on Subaru. We find a strong increase in L<inf>*</inf> and a decrease in ϕ<inf>*</inf> for both Hβ + [O III] and [O II] emitters. We derive the [O II] star formation history of the Universe since z ~ 5 and find that the cosmic star formation rate density (SFRD) rises from z ~ 5 to ~3 and then drops towards z ~ 0. We also find that our star formation history is able to reproduce the evolution of the stellar mass density up to z ~ 5 based only on a single tracer of star formation. When comparing the Hβ + [O III] SFRDs to the [OII] and Hα SFRD measurements in the literature, we find that there is a remarkable agreement, suggesting that the Hβ + [O III] sample is dominated by star-forming galaxies at high-z rather than AGNs.

Bibliographic note

This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version A. A. Khostovan, D. Sobral, B. Mobasher, P. N. Best, I. Smail, J. P. Stott, S. Hemmati, and H. Nayyeri Evolution of the H β + [O III] and [O II] luminosity functions and the [O II] star formation history of the Universe up to z ∼ 5 from HiZELS MNRAS (October 01, 2015) Vol. 452 3948-3968 doi:10.1093/mnras/stv1474 First published online August 10, 2015 is available online at: http://mnras.oxfordjournals.org/content/452/4/3948