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

Gonzalez-Perez, V.; Comparat, J.; Norberg, P.; Baugh, C.M.; Contreras, S.; Lacey, C.; McCullagh, N.; Orsi, A.; Helly, J.; Humphries, J.

doi:10.1093/mnras/stx2807

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

Gonzalez-Perez, V.; Comparat, J.; Norberg, P.; Baugh, C.M.; Contreras, S.; Lacey, C.; McCullagh, N.; Orsi, A.; Helly, J.; Humphries, J.

Authors

V. Gonzalez-Perez

J. Comparat

Professor Peder Norberg peder.norberg@durham.ac.uk
Professor

Professor Carlton Baugh c.m.baugh@durham.ac.uk
Professor

S. Contreras

Professor Cedric Lacey cedric.lacey@durham.ac.uk
Professor

N. McCullagh

A. Orsi

J. Helly

J. Humphries

Abstract

Emission line galaxies (ELGs) are used in several ongoing and upcoming surveys (SDSSIV/eBOSS, DESI) as tracers of the dark matter distribution. Using a new galaxy formation model, we explore the characteristics of [O II] emitters, which dominate optical ELG selections at z 1. Model [O II] emitters at 0.5 < z < 1.5 are selected to mimic the DEEP2, VVDS, eBOSS and DESI surveys. The luminosity functions of model [O II] emitters are in reasonable agreement with observations. The selected [O II] 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 [O II] emitters have a shape typical of that inferred for star-forming galaxies, with the contribution from central galaxies, N[O II] cen, being far from the canonical step function. The N[O II] 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 [O II] 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 [O II] emitters, indicates that our model produces too few [O II] emitters that are satellite galaxies. This suggests the need to revise our modelling of hot gas stripping in satellite galaxies.

Citation

Gonzalez-Perez, V., Comparat, J., Norberg, P., Baugh, C., Contreras, S., Lacey, C., …Humphries, J. (2018). The host dark matter haloes of [O II] emitters at 0.5 < z < 1.5. Monthly Notices of the Royal Astronomical Society, 474(3), 4024-4038. https://doi.org/10.1093/mnras/stx2807

Journal Article Type	Article
Acceptance Date	Oct 26, 2017
Online Publication Date	Oct 30, 2017
Publication Date	Mar 1, 2018
Deposit Date	Jan 15, 2018
Publicly Available Date	Jan 16, 2018
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	474
Issue	3
Pages	4024-4038
DOI	https://doi.org/10.1093/mnras/stx2807

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.