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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.

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 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.', Monthly notices of the Royal Astronomical Society., 452 (4). pp. 3948-3968.


We investigate the evolution of the H β + [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 H β + [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 H β + [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 H β + [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 H β + [O iii] SFRDs to the [O ii] and H α SFRD measurements in the literature, we find that there is a remarkable agreement, suggesting that the H β + [O iii] sample is dominated by star-forming galaxies at high-z rather than AGNs.

Item Type:Article
Keywords:Galaxies: evolution, Galaxies: high-redshift, Galaxies: luminosity function, mass function, Cosmology: observations
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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:01 July 2015
Date deposited:19 February 2016
Date of first online publication:October 2015
Date first made open access:No date available

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