Skip to main content

Research Repository

Advanced Search

The clustering evolution of dusty star-forming galaxies

Cowley, W.I.; Lacey, C.G.; Baugh, C.M.; Cole, S.

The clustering evolution of dusty star-forming galaxies Thumbnail


W.I. Cowley


We present predictions for the clustering of galaxies selected by their emission at far-infrared (FIR) and sub-millimetre wavelengths. This includes the first predictions for the effect of clustering biases induced by the coarse angular resolution of single-dish telescopes at these wavelengths. We combine a new version of the GALFORM model of galaxy formation with a self-consistent model for calculating the absorption and re-emission of radiation by interstellar dust. Model galaxies selected at 850μm reside in dark matter haloes of mass Mhalo ∼ 1011.5–1012 h−1 M⊙, independent of redshift (for 0.2 ≲ z ≲ 4) or flux (for 0.25 ≲ S850 μm ≲ 4 mJy). At z ∼ 2.5, the brightest galaxies (S850 μm > 4 mJy) exhibit a correlation length of r0=5.5+0.3−0.5r0=5.5−0.5+0.3 h−1 Mpc, consistent with observations. We show that these galaxies have descendants with stellar masses M⋆ ∼ 1011 h−1 M⊙ occupying haloes spanning a broad range in mass Mhalo ∼ 1012–1014 h−1 M⊙. The FIR emissivity at shorter wavelengths (250, 350 and 500 μm) is also dominated by galaxies in the halo mass range Mhalo ∼ 1011.5–1012 h−1 M⊙, again independent of redshift (for 0.5 ≲ z ≲ 5). We compare our predictions for the angular power spectrum of cosmic infrared background anisotropies at these wavelengths with observations, finding agreement to within a factor of ∼2 over all scales and wavelengths, an improvement over earlier versions of the model. Simulating images at 850 μm, we show that confusion effects boost the measured angular correlation function on all scales by a factor of ∼4. This has important consequences, potentially leading to inferred halo masses being overestimated by an order of magnitude.


Cowley, W., Lacey, C., Baugh, C., & Cole, S. (2016). The clustering evolution of dusty star-forming galaxies. Monthly Notices of the Royal Astronomical Society, 461(2), 1621-1641.

Journal Article Type Article
Acceptance Date May 3, 2016
Online Publication Date May 6, 2016
Publication Date Sep 11, 2016
Deposit Date Sep 28, 2016
Publicly Available Date Oct 6, 2016
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 461
Issue 2
Pages 1621-1641


Published Journal Article (2.5 Mb)

Copyright Statement
This article has been published in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

You might also like

Downloadable Citations