Which halos host Herschel-ATLAS galaxies in the local Universe?
Qi Guo, Shaun Cole, Cedric G. Lacey, Carlton M. Baugh, Carlos S., Frenk, Peder Norberg, R. Auld, I. K. Baldry, S. P. Bamford, N. Bourne, E. S., Buttiglione, A. Cava, A. Cooray, S. Croom, A. Dariush, G. De Zotti, S., Driver, L. Dunne, S. Dye, S. Eales, J. Fritz, A. Hopkins

TL;DR
This study analyzes the clustering of low-redshift Herschel-ATLAS galaxies and finds they are typically hosted by halos similar in mass to the Milky Way, with brighter, more star-forming galaxies residing in more massive halos.
Contribution
It provides the first cross-correlation measurement between Herschel-ATLAS far-IR galaxies and optical GAMA galaxies, revealing their typical halo masses and luminosity-dependent clustering.
Findings
H-ATLAS galaxies have a correlation length of ~4.63 Mpc.
H-ATLAS galaxies are hosted by halos comparable to the Milky Way.
Brighter, star-forming galaxies are more strongly clustered.
Abstract
We measure the projected cross-correlation between low redshift (z < 0.5) far-IR selected galaxies in the SDP field of the Herschel-ATLAS (H-ATLAS) survey and optically selected galaxies from the Galaxy and Mass Assembly (GAMA) redshift survey. In order to obtain robust correlation functions, we restrict the analysis to a subset of 969 out of 6900 H-ATLAS galaxies, which have reliable optical counterparts with r<19.4 mag and well-determined spectroscopic redshifts. The overlap region between the two surveys is 12.6 sq. deg; the matched sample has a median redshift of z ~ 0.2. The cross-correlation of GAMA and H-ATLAS galaxies within this region can be fitted by a power law, with correlation length r_0 ~ 4.63 +/- 0.51 Mpc. Comparing with the corresponding auto-correlation function of GAMA galaxies within the SDP field yields a relative bias (averaged over 2-8 Mpc) of H-ATLAS and GAMA…
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