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

Khostovan, A. A. and Sobral, D. and Mobasher, B. and Best, P. N. and Smail, I. and Stott, J. P. and Hemmati, S. and Nayyeri, H. (2015) 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. Monthly Notices of the Royal Astronomical Society, 452 (4). pp. 3948-3968. ISSN 0035-8711

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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.

Item Type:
Journal Article
Journal or Publication Title:
Monthly Notices of the Royal Astronomical Society
Additional Information:
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
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3103
Subjects:
ID Code:
77716
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Deposited On:
18 Jan 2016 10:14
Refereed?:
Yes
Published?:
Published
Last Modified:
07 Apr 2020 03:34