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

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Date
11/08/2014
Author
Guo, Q.
Lacey, C.
Norberg, P.
Cole, S.
Baugh, C.
Frenk, C.
Cooray, A.
Dye, S.
Bourne, N.
Dunne, L.
Eales, S.
Ivison, R.J.
Maddox, S.J.
Alpasan, M.
Baldry, I.
Bland-Hawthorn, J.
Driver, S.P.
Robotham, A.
Keywords
Galaxies: clusters: general
Galaxies: formation
Galaxies: haloes
Galaxies: luminosity function, mass function
Cosmology: theory
Infrared: galaxies
QB Astronomy
QC Physics
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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−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.
Citation
Guo , Q , Lacey , C , Norberg , P , Cole , S , Baugh , C , Frenk , C , Cooray , A , Dye , S , Bourne , N , Dunne , L , Eales , S , Ivison , R J , Maddox , S J , Alpasan , M , Baldry , I , Bland-Hawthorn , J , Driver , S P & 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 , vol. 442 , no. 3 , pp. 2253-2270 . https://doi.org/10.1093/mnras/stu962
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stu962
ISSN
0035-8711
Type
Journal article
Rights
© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Description
QG acknowledges support from a Newton International Fellowship, the NSFC grants (Nos 11143005 and No.11133003) and the Strategic Priority Research Program, The Emergence of Cosmological Structure of the Chinese Academy of Sciences (No. XDB09000000). PN acknowledges the support of the Royal Society through the award of a University Research Fellowship and the European Research Council, through receipt of a Starting Grant (DEGAS-259586). CSF acknowledges a Royal Society Wolfson Research Grant Award. This work was supported in part by the Science and Technology Facilities Council rolling grant ST/F001166/1 to the ICC.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5364

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