A1 Refereed original research article in a scientific journal
On the cosmological evolution of the black hole-host galaxy relation in quasars
Authors: Portinari L, Kotilainen J, Falomo R, Decarli R
Publisher: WILEY-BLACKWELL
Publication year: 2012
Journal: Monthly Notices of the Royal Astronomical Society
Journal name in source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Number in series: 1
Volume: 420
Issue: 1
First page : 732
Last page: 744
Number of pages: 13
ISSN: 0035-8711
DOI: https://doi.org/10.1111/j.1365-2966.2011.20086.x
Abstract
Observed quasar hosts are consistent with no evolution from the local M-BH-L-host relation and suggest a significant increase of the mass ratio Gamma = M-BH/M-star(host) from z = 0 to 3. Taken at face value, this is totally at odds with the predictions of SAMs, where the intrinsic Gamma shows little evolution and quasar host galaxies at high redshift are systematically overluminous (and/or have an undermassive BH). However, since quasars preferentially trace very massive black holes (10(9)-10(10) M-circle dot) at the steep end of the luminosity and mass function, the ensuing selection biases can reconcile the present SAMs with the observations. A proper interpretation of quasar host data thus requires the global approach of SAMs so as to account for statistical biases.
Observed quasar hosts are consistent with no evolution from the local M-BH-L-host relation and suggest a significant increase of the mass ratio Gamma = M-BH/M-star(host) from z = 0 to 3. Taken at face value, this is totally at odds with the predictions of SAMs, where the intrinsic Gamma shows little evolution and quasar host galaxies at high redshift are systematically overluminous (and/or have an undermassive BH). However, since quasars preferentially trace very massive black holes (10(9)-10(10) M-circle dot) at the steep end of the luminosity and mass function, the ensuing selection biases can reconcile the present SAMs with the observations. A proper interpretation of quasar host data thus requires the global approach of SAMs so as to account for statistical biases.
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