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arXiv · 1203.5828

Connecting stellar mass and star-formation rate to dark matter halo mass out to z ~ 2

L. Wang·D. Farrah·S. J. Oliver·A. Amblard·J. Bock·A. Conley·A. Cooray·M. Halpern·S. Heinis·E. Ibar·O. Ilbert·R. J. Ivison·G. Marsden·I. G. Roseboom·M. Rowan-Robinson·B. Schulz·A. J. Smith·M. Viero·M. Zemcov
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Abstract

We have constructed an extended halo model (EHM) which relates the total stellar mass and star-formation rate (SFR) to halo mass (M_h). An empirical relation between the distribution functions of total stellar mass of galaxies and host halo mass, tuned to match the spatial density of galaxies over 0<z<2 and the clustering properties at z~0, is extended to include two different scenarios describing the variation of SFR on M_h. We also present new measurements of the redshift evolution of the average SFR for star-forming galaxies of different stellar mass up to z=2, using data from the Herschel Multi-tiered Extragalactic Survey (HerMES) for infrared-bright galaxies. Combining the EHM with the halo accretion histories from numerical simulations, we trace the stellar mass growth and star-formation history in halos spanning a range of masses. We find that: (1) The intensity of the star-forming activity in halos in the probed mass range has steadily decreased from z~2 to 0; (2) At a given epoch, halos in the mass range between a few times 10^{11} M_Sun and a few times 10^{12} M_Sun are the most efficient at hosting star formation; (3) The peak of SFR density shifts to lower mass halos over time; (4) Galaxies that are forming stars most actively at z~2 evolve into quiescent galaxies in today's group environments, strongly supporting previous claims that the most powerful starbursts at z~2 are progenitors of today's elliptical galaxies.

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L. Wang, D. Farrah, S. J. Oliver, A. Amblard, J. Bock, A. Conley, A. Cooray, M. Halpern, S. Heinis, E. Ibar, O. Ilbert, R. J. Ivison, G. Marsden, I. G. Roseboom, M. Rowan-Robinson, B. Schulz, A. J. Smith, M. Viero, M. Zemcov. 2013-02-07. Connecting stellar mass and star-formation rate to dark matter halo mass out to z ~ 2. https://doi.org/10.1093/mnras%2Fstt190

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