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Astron. Astrophys. 357, 1-6 (2000)

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Sunyaev-Zel'dovich constraints from black hole-seeded proto-galaxies

N. Aghanim 1, C. Balland 1 and J. Silk 2

1 Université Paris Sud, IAS-CNRS, Bâtiment 121, 91405 Orsay Cedex, France
2 University of Oxford, Department of Astrophysics, NAPL, Keble Road, Oxford OX13RH, UK

Received 10 August 1999 / Accepted 1 March 2000


Recent studies of galactic nuclei suggest that most galaxies are seeded by super-massive black holes which power the central nucleus. In this picture, the proto-galactic object is likely to have undergone a very active phase during which the surrounding medium was shocked and heated up to very high temperatures. We predict the cosmological effects of this scenario in terms of the thermal and kinetic Sunyaev-Zel'dovich distortions induced on galactic scales by a population of proto-galaxies. These predictions are compared to the observational limit on the mean Compton distortion set by the COBE-FIRAS instrument. This enables us to derive tight constraints on the fraction of proto-galaxies seeded by super-massive black holes as well as on the black hole-to-spheroid mass ratio. Finally, we estimate the contribution of such a population to the angular power spectrum of the Cosmic Microwave Background temperature anisotropies on very small angular scales ([FORMULA]).

Key words: Galaxy: formation – cosmology: cosmic microwave background

Send offprint requests to: N. Aghanim (aghanim@ias.fr)

© European Southern Observatory (ESO) 2000

Online publication: May 3, 2000