TY - JOUR

T1 - The dependence of galaxy clustering on stellar mass, star-formation rate and redshift at z = 0.8 − 2.2, with HiZELS

AU - Cochrane, R. K.

AU - Best, P.

AU - Sobral, David

AU - Smail, Ian

AU - Geach, James E.

AU - Stott, John Philip

AU - Wake, D. A.

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 R K Cochrane, P N Best, D Sobral, I Smail, J E Geach, J P Stott, D A Wake; 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, Volume 475, Issue 3, 11 April 2018, Pages 3730–3745, https://doi.org/10.1093/mnras/stx3345 is available online at: https://academic.oup.com/mnras/article/475/3/3730/4791583

PY - 2018/4/11

Y1 - 2018/4/11

N2 - The deep, near-infrared narrow-band survey HiZELS has yielded robust samples of Hα-emitting star-forming galaxies within narrow redshift slices at z = 0.8, 1.47 & 2.23. In this paper, we distinguish the stellar mass and star-formation rate (SFR) depen- dence of the clustering of these galaxies. At high stellar masses (M∗/M⊙ ﰀ 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.

AB - The deep, near-infrared narrow-band survey HiZELS has yielded robust samples of Hα-emitting star-forming galaxies within narrow redshift slices at z = 0.8, 1.47 & 2.23. In this paper, we distinguish the stellar mass and star-formation rate (SFR) depen- dence of the clustering of these galaxies. At high stellar masses (M∗/M⊙ ﰀ 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.

KW - galaxies: evolution

KW - galaxies: high-redshift

KW - galaxies: halo

KW - cosmology: large-scale structure of Universe

U2 - 10.1093/mnras/stx3345

DO - 10.1093/mnras/stx3345

M3 - Journal article

VL - 475

SP - 3730

EP - 3745

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -