Young ellipticals at high redshift

Astronomy and Astrophysics – Astronomy

Scientific paper

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Active Galactic Nuclei, Elliptical Galaxies, Galactic Evolution, Quasars, Red Shift, Starburst Galaxies, Active Galaxies, Luminosity, Star Clusters, Star Formation

Scientific paper

Recent work has raised the intriguing possibility that the activity seen in many AGNs may be powered solely by young stars and SNRs in a burst of star formation at the time when the metal-rich cores of large spheroids were formed. We explore the hypothesis that QSOs are the young cores of massive ellipticals forming at z greater than about 2.0. Only a small fraction (about 5 percent) of the total mass of elliptical galaxies, the core mass, is needed to participate in a burst to explain the observed luminosities and luminosity function of QSOs at z above about 2.0. Following the initial burst, models for the subsequent decline of the star formation rate in the core can also provide a good fit to the observed evolution of the QSO luminosity function.

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