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

Guo, Q., Lacey, C., Norberg, P., Cole, S., Baugh, C., Frenk, C., Cooray, A., Dye, S., Bourne, N., Dunne, Loretta ORCID:, Eales, Stephen Anthony ORCID:, Ivison, R. J., Maddox, Steve ORCID:, Alpasan, M., Baldry, I., Bland-Hawthorn, J., Driver, S. P. and 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) , pp. 2253-2270. 10.1093/mnras/stu962

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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−1 M⊙ and on redshift in the range 0 < z < 0.4, using a sample of 3000 groups containing H-ATLAS sources with GAMA redshifts over an area of 126 deg2. We find that the characteristic 250 μm luminosity, L*(250), increases with group mass up to Mh ∼ 1013 h−1 M⊙, but is roughly constant above this, while it increases with redshift at high group masses, but less so at low masses. We also find that the group far-IR luminosity-to-mass ratio L(250)/Mh increases with redshift and is higher in low-mass groups. We estimate that around 70 per cent of the 250 μm luminosity density in the local Universe is contributed by groups with Mh > 1012 h−1 M⊙. 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−1 M⊙ 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of Acceptance: 12 May 2014
Last Modified: 27 Oct 2022 10:17

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