Which haloes host Herschel-ATLAS galaxies in the local Universe?

Guo, Qi; Cole, Shaun; Lacey, Cedric G.; Baugh, Carlton M.; Frenk, Carlos S.; Norberg, Peder; Auld, R.; Baldry, I. K.; Bamford, S. P.; Bourne, N.; Buttiglione, E. S.; Cava, A.; Cooray, A.; Croom, S.; Dariush, A.; de Zotti, G.; Driver, S.; Dunne, L.; Dye, S.; Eales, S.; Fritz, J.; Hopkins, A.; Hopwood, R.; Ibar, E.; Ivison, R. J.; Jarvis, M.; Jones, D. H.; Kelvin, L.; Liske, J.; Loveday, J.; Maddox, S. J.; Parkinson, H.; Pascale, E.; Peacock, J. A.; Pohlen, M.; Prescott, M.; Rigby, E. E.; Robotham, A.; Rodighiero, G.; Sharp, R.; Smith, D. J. B.; Temi, P.; van Kampen, E.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 412, Issue 4, pp. 2277-2285.

Advertised on:
4
2011
Number of authors
43
IAC number of authors
1
Citations
18
Refereed citations
16
Description
We measure the projected cross-correlation between low-redshift (z < 0.5) far-infrared selected galaxies in the science demonstration phase (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 deg2; 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 r0≈ 4.63 ± 0.51 Mpc. Comparing with the corresponding autocorrelation function of GAMA galaxies within the SDP field yields a relative bias (averaged over 2-8 Mpc) of H-ATLAS and GAMA galaxies of bH/bG≈ 0.6. Combined with clustering measurements from previous optical studies, this indicates that most of the low-redshift H-ATLAS sources are hosted by haloes with masses comparable to that of the Milky Way. The correlation function appears to depend on the 250-μm luminosity, L250, with bright (median luminosity νL250˜ 1.6 × 1010 L&sun;) objects being somewhat more strongly clustered than faint (νL250˜ 4.0 × 109 L&sun;) objects. This implies that galaxies with higher dust-obscured star formation rates are hosted by more massive haloes.
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Formation and Evolution of Galaxies: Observations in Infrared and other Wavelengths
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