Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-11-16
Mon.Not.Roy.Astron.Soc. 324 (2001) 757
Astronomy and Astrophysics
Astrophysics
13 pages, 8 figures, accepted by MNRAS, major revision of the formalism
Scientific paper
10.1046/j.1365-8711.2001.04369.x
Direct and indirect observational evidence leads to the conclusion that high redshift QSOs did shine in the core of early type proto-galaxies during their main episode of star formation. Exploting this fact, we derive the rate of formation of this kind of stellar systems at high redshift by using the QSO Luminosity Function. The elemental proportions in elliptical galaxies, the descendents of the QSO hosts, suggest that the star formation was more rapid in more massive objects. We show that this is expected to occur in Dark Matter haloes, when the processes of cooling and heating is considered. This is also confirmed by comparing the observed sub-mm counts to those derived by coupling the formation rate and the star formation rate of the spheroidal galaxies with a detailed model for their SED evolution. In this scenario SCUBA galaxies and Lyman Break Galaxies are early type proto-galaxies forming the bulk of their stars before the onset of QSO activity.
Danese Lugi
de Zotti Gianfranco
Granato Gian Luigi
Monaco Pierluigi
Panuzzo Pasquale
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