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The bias of the submillimetre galaxy population: SMGs are poor tracers of the most-massive structures in the z ∼ 2 Universe

Miller, Tim B. and Hayward, Christopher C. and Chapman, Scott C. and Behroozi, Peter S. (2015) The bias of the submillimetre galaxy population: SMGs are poor tracers of the most-massive structures in the z ∼ 2 Universe. Monthly Notices of the Royal Astronomical Society, 452 (1). pp. 878-883. ISSN 0035-8711.

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It is often claimed that overdensities of (or even individual bright) submillimetre-selected galaxies (SMGs) trace the assembly of the most-massive dark matter structures in the Universe. We test this claim by performing a counts-in-cells analysis of mock SMG catalogues derived from the Bolshoi cosmological simulation to investigate how well SMG associations trace the underlying dark matter structure. We find that SMGs exhibit a relatively complex bias: some regions of high SMG overdensity are underdense in terms of dark matter mass, and some regions of high dark matter overdensity contain no SMGs. Because of their rarity, Poisson noise causes scatter in the SMG overdensity at fixed dark matter overdensity. Consequently, rich associations of less-luminous, more-abundant galaxies (i.e. Lyman-break galaxy analogues) trace the highest dark matter overdensities much better than SMGs. Even on average, SMG associations are relatively poor tracers of the most significant dark matter overdensities because of ‘downsizing’: at z ≲ 2.5, the most-massive galaxies that reside in the highest dark matter overdensities have already had their star formation quenched and are thus no longer SMGs. At a given redshift, of the 10 per cent most-massive overdensities, only ∼25 per cent contain at least one SMG, and less than a few per cent contain more than one SMG.

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URLURL TypeDescription Paper
Hayward, Christopher C.0000-0003-4073-3236
Additional Information:© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2015 May 6. Received 2015 May 3. In original form 2015 January 14. First published online July 13, 2015. We thank Neal Katz for useful discussion and Phil Hopkins for comments on the manuscript. We thank the anonymous referee for a constructive report that helped improve the manuscript. CCH is grateful to the Gordon and Betty Moore Foundation for financial support and acknowledges the hospitality of the Aspen Center for Physics, which is supported by the National Science Foundation Grant No. PHY-1066293. PSB was supported by a Giacconi Fellowship provided through the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy under NASA contract NAS5-26555.
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Giacconi fellowship at STScIUNSPECIFIED
Subject Keywords:cosmology: theory – cosmology: large-scale structure of Universe – galaxies: clusters: general – galaxies: high-redshift – methods: numerical – submillimeter: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20150428-152927873
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Official Citation:Tim B. Miller, Christopher C. Hayward, Scott C. Chapman, and Peter S. Behroozi The bias of the submillimetre galaxy population: SMGs are poor tracers of the most-massive structures in the z ∼ 2 Universe MNRAS (September 01, 2015) Vol. 452 878-883 doi:10.1093/mnras/stv1267 First published online July 13, 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57069
Deposited By: Christopher Hayward
Deposited On:28 Apr 2015 23:22
Last Modified:03 Oct 2019 08:20

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