Theoretical predictions on the clustering of SCUBA galaxies and implications for small-scale fluctuations at submillimetre wavelengths |
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Authors: | M Magliocchetti L Moscardini P Panuzzo GL Granato G De Zotti L Danese |
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Institution: | 1SISSA, Via Beirut 4, 34100, Trieste, Italy;2Dipartimento di Astronomia, Universitàdi Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy;3Osservatorio Astronomico, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy |
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Abstract: | This paper investigates the clustering properties of Submillimetre Common User Bolometric Array (SCUBA) selected galaxies within the framework of a unifying scheme relating the formation of quasi-stellar objects and spheroids. The theoretical angular correlation function is derived for different bias functions, corresponding to different values of the ratio M halo/ M sph between the mass of the dark halo and the final mass in stars. SCUBA sources are predicted to be strongly clustered, with a clustering strength increasing with mass. We show that the model accounts for the clustering of Lyman-break galaxies, seen as the optical counterpart of low- to intermediate-mass primeval spheroidal galaxies, and is also consistent with the observed angular correlation function of extremely red objects. Best agreement is obtained for M halo/ M sph=100 . We also consider the implications for small-scale fluctuations observed at submillimetre wavelengths by current or forthcoming experiments aimed at mapping the cosmic microwave background (CMB). The predicted amplitude of the clustering signal in the 350-GHz channel of the Planck mission strongly depends on the halo-to-bulge mass ratio and may be of comparable amplitude to primary CMB anisotropies for multipole numbers l ?50 . |
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Keywords: | galaxies: clusters: general cosmic microwave background cosmology: theory large-scale structure of Universe infrared: galaxies |
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