Herschel-ATLAS/GAMA: How does the far-IR luminosity function depend on galaxy group properties?

Q. Guo, C.G. Lacey, P. Norberg, S.M. Cole, C.M. Baugh, C.S. Frenk, A.R. Cooray, S. Dye, N. Bourne, L. Dunne, S.A. Eales, R.J. Ivison, S.J. Maddox, M. Alpasan, I.K. Baldry, J. Bland-Hawthorn, Simon Driver, Aaron Robotham

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    Abstract

    We use the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) Phase I data to study the conditional luminosity function of far-IR (250 μm) selected galaxies in optically selected galaxy groups from the Galaxy And Mass Assembly (GAMA) spectroscopic survey, as well as environmental effects on the far-IR-to-optical colour.We applied two methods, which gave consistent results for the far-IR conditional luminosity functions. The direct matching method matches H-ATLAS sources to GAMA/SDSS (Sloan Digital Sky Survey) galaxies, then links the optical counterparts to GAMA groups. The stacking method counts the number of far-IR sources within the projected radii of GAMA groups, subtracting the local background. We investigated the dependence of the far-IR (250 μm) luminosity function on group mass in the range 1012 <Mh <1014 h-1M⊙ and on redshift in the range 0 <z 1012 h-1M⊙. We also find that the far-IR-to-optical colours of H-ATLAS galaxies are independent of group mass over the range 1012 <Mh <1014 h-1M⊙ in the local Universe.We also compare our observational results with recent semi-analytical models, and find that none of these galaxy formation models can reproduce the conditional far-IR luminosity functions of galaxy groups. © 2014 The Authors.
    Original languageEnglish
    Pages (from-to)2253-2270
    JournalMonthly Notices of the Royal Astronomical Society
    Volume442
    Issue number3
    DOIs
    Publication statusPublished - 2014

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    Guo, Q., Lacey, C. G., Norberg, P., Cole, S. M., Baugh, C. M., Frenk, C. S., Cooray, A. R., Dye, S., Bourne, N., Dunne, L., Eales, S. A., Ivison, R. J., Maddox, S. J., Alpasan, M., Baldry, I. K., Bland-Hawthorn, J., Driver, S., & Robotham, A. (2014). Herschel-ATLAS/GAMA: How does the far-IR luminosity function depend on galaxy group properties? Monthly Notices of the Royal Astronomical Society, 442(3), 2253-2270. https://doi.org/10.1093/mnras/stu962