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

Autor: Guo, Q, Cole, S, Lacey, CG, Baugh, CM, Frenk, CS, Norberg, P, Auld, R, Baldry, IK, Bamford, SP, Bourne, N, Buttiglione, ES, 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, RJ, Jarvis, M, Jones, DH, Kelvin, L, Liske, J, Loveday, J, Maddox, SJ, Parkinson, H, Pascale, E, Peacock, JA, Pohlen, M, Prescott, M, Rigby, EE, Robotham, A, Rodighiero, G, Sharp, R, Smith, DJB, Temi, P, van Kampen, E
Rok vydání: 2011
Předmět:
Zdroj: Monthly notices of the Royal Astronomical Society, 2011, Vol.412(4), pp.2277-2285 [Peer Reviewed Journal]
Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
Popis: 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⊙) objects being somewhat more strongly clustered than faint (νL250∼ 4.0 × 109 L⊙) objects. This implies that galaxies with higher dust-obscured star formation rates are hosted by more massive haloes.
Databáze: OpenAIRE
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