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The dependence of galaxy clustering on stellar mass, star-formation rate and redshift at z = 0.8–2.2, with HiZELS

Cochrane, R.K.; Best, P.N.; Sobral, D.; Smail, I.; Geach, J.E.; Stott, J.P.; Wake, D.A.

The dependence of galaxy clustering on stellar mass, star-formation rate and redshift at z = 0.8–2.2, with HiZELS Thumbnail


Authors

R.K. Cochrane

P.N. Best

D. Sobral

J.E. Geach

J.P. Stott

D.A. Wake



Abstract

The deep, near-infrared narrow-band survey HiZELS has yielded robust samples of H α-emitting star-forming galaxies within narrow redshift slices at z = 0.8,  1.47 and 2.23. In this paper, we distinguish the stellar mass and star-formation rate (SFR) dependence of the clustering of these galaxies. At high stellar masses (M*/M⊙ ≳ 2 × 1010), where HiZELS selects galaxies close to the so-called star-forming main sequence, the clustering strength is observed to increase strongly with stellar mass (in line with the results of previous studies of mass-selected galaxy samples) and also with SFR. These two dependencies are shown to hold independently. At lower stellar masses, however, where HiZELS probes high specific SFR galaxies, there is little or no dependence of the clustering strength on stellar mass, but the dependence on SFR remains: high-SFR low-mass galaxies are found in more massive dark matter haloes than their lower SFR counterparts. We argue that this is due to environmentally driven star formation in these systems. We apply the same selection criteria to the EAGLE cosmological hydrodynamical simulations. We find that, in EAGLE, the high-SFR low-mass galaxies are central galaxies in more massive dark matter haloes, in which the high SFRs are driven by a (halo-driven) increased gas content.

Citation

Cochrane, R., Best, P., Sobral, D., Smail, I., Geach, J., Stott, J., & Wake, D. (2018). The dependence of galaxy clustering on stellar mass, star-formation rate and redshift at z = 0.8–2.2, with HiZELS. Monthly Notices of the Royal Astronomical Society, 475(3), 3730-3745. https://doi.org/10.1093/mnras/stx3345

Journal Article Type Article
Acceptance Date Dec 18, 2017
Online Publication Date Jan 5, 2018
Publication Date Apr 11, 2018
Deposit Date Apr 13, 2018
Publicly Available Date Mar 28, 2024
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 475
Issue 3
Pages 3730-3745
DOI https://doi.org/10.1093/mnras/stx3345

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.





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