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The host dark matter haloes of [O II] emitters at 0.5 < z < 1.5

Gonzalez-Perez, V, Comparat, J, Norberg, P, Baugh, CM, Contreras, S, Lacey, C, McCullagh, N, Orsi, A, Helly, J and Humphries, J (2017) The host dark matter haloes of [O II] emitters at 0.5 < z < 1.5. Monthly Notices of the Royal Astronomical Society, 474 (3). pp. 4024-4038. ISSN 0035-8711

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Abstract

Emission line galaxies (ELGs) are used in several ongoing and upcoming surveys (SDSS-IV/eBOSS, DESI) as tracers of the dark matter distribution. Using a new galaxy formation model, we explore the characteristics of [OII] emitters, which dominate optical ELG selections at z ≃ 1. Model [OII] emitters at 0.5 < z < 1.5 are selected to mimic the DEEP2, VVDS, eBOSS and DESI surveys. The luminosity functions of model [OII] emitters are in reasonable agreement with observations. The selected [OII] emitters are hosted by haloes with Mhalo ≥ 1010.3h−1M⊙, with ∼90 per cent of them being central star-forming galaxies. The predicted mean halo occupation distributions of [OII] emitters have a shape typical of that inferred for star-forming galaxies, with the contribution from central galaxies, ⟨N⟩[OII]cen⁠, being far from the canonical step function. The ⟨N⟩[OII]cen can be described as the sum of an asymmetric Gaussian for discs and a step function for spheroids, which plateau below unity. The model [OII] emitters have a clustering bias close to unity, which is below the expectations for eBOSS and DESI ELGs. At z ∼ 1, a comparison with observed g-band-selected galaxy, which is expected to be dominated by [OII] emitters, indicates that our model produces too few [OII] emitters that are satellite galaxies. This suggests the need to revise our modelling of hot gas stripping in satellite galaxies.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 24 Jan 2020 09:50
Last Modified: 24 Jan 2020 10:00
DOI or Identification number: 10.1093/mnras/stx2807
URI: http://researchonline.ljmu.ac.uk/id/eprint/12097

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