A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
On the cosmological evolution of the black hole-host galaxy relation in quasars
Tekijät: Portinari L, Kotilainen J, Falomo R, Decarli R
Kustantaja: WILEY-BLACKWELL
Julkaisuvuosi: 2012
Journal: Monthly Notices of the Royal Astronomical Society
Tietokannassa oleva lehden nimi: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Lehden akronyymi: MON NOT R ASTRON SOC
Numero sarjassa: 1
Vuosikerta: 420
Numero: 1
Aloitussivu: 732
Lopetussivu: 744
Sivujen määrä: 13
ISSN: 0035-8711
DOI: https://doi.org/10.1111/j.1365-2966.2011.20086.x
Tiivistelmä
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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