TY - JOUR

T1 - 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

AU - Khostovan, A. A.

AU - Sobral, D.

AU - Mobasher, B.

AU - Best, P. N.

AU - Smail, I.

AU - Stott, J. P.

AU - Hemmati, S.

AU - Nayyeri, H.

N1 - 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

PY - 2015/10/1

Y1 - 2015/10/1

N2 - 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 × 106 Mpc-3 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* and a decrease in ϕ* 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.

AB - 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 × 106 Mpc-3 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* and a decrease in ϕ* 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.

KW - Cosmology: observations

KW - Galaxies: evolution

KW - Galaxies: high-redshift

KW - Galaxies: luminosity function, mass function

U2 - 10.1093/mnras/stv1474

DO - 10.1093/mnras/stv1474

M3 - Journal article

AN - SCOPUS:84940121835

VL - 452

SP - 3948

EP - 3968

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -