Co-Evolution of Supermassive Black Holes and Their Host Galaxies

: Kotilainen JK, Decarli R, Falomo R, Treves A, Labita M, Scarpa R

: Symposium of the International Astronomical Union

: 2010

: Proceedings of the International Astronomical Union

: Co-evolution of central black holes and galaxies

: CO-EVOLUTION OF CENTRAL BLACK HOLES AND GALAXIES

: IAU SYMP P SERIES

: 5

: S267

: 34

: 39

: 6

: 978-0-521-76502-2

: 1743-9213

DOI: https://doi.org/10.1017/S1743921310005533

We study the evolution of the M-BH /M-host relation up to z = 3 for a sample of 96 quasars with known host galaxy luminosities. Black hole masses are estimated assuming virial equilibrium in the broad-line regions, while the host galaxy masses are inferred from their luminosities. With this data, we are able to pin down the evolution of the M-BH /M-host relation over 85% of the age of the universe. While the M-BH /M-host relation remains nearly unchanged, taking into account the aging of the stellar population, we find that the M-BH /M-host ratio (Gamma) increases by a factor similar to 7 from z = 0 to z = 3. We show that the evolution of F is independent of radio loudness and quasar luminosity. We propose that the most massive black holes, in their quasar phase at high-redshift, become extremely rare objects in host galaxies of similar mass in the local universe.