The estimation of black-hole masses in distant radio galaxies |
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| Authors: | M L Khabibullina and O V Verkhodanov |
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| Institution: | (1) INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy;(2) SISSA/ISAS, Via Beirut 2–4, 34014 Trieste, Italy;(3) Department of Physics and Astronomy, Open University, Walton Hall, Milton Keynes, MK7 6AA, UK;(4) Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada |
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| Abstract: | We have estimated the masses of the central supermassive black holes of 2442 radio galaxies froma catalog compiled using data
from the NED, SDSS, and CATS databases. Mass estimates based on optical photometry and radio data are compared. Relationships
between the mass of the central black hole M
p
bh
and the redshift z
p
are constructed for both wavelength ranges. The distribution of the galaxies in these diagrams and systematic effects influencing
estimation of the black-hole parameters are discussed. Upperenvelope cubic regression fits are obtained using the maximum
estimates of the black-hole masses. The optical and radio upper envelopes show similar behavior, and have very similar peaks
in position, z
p
≅ 1.9, and amplitude, log M
p/bh
= 9.4. This is consistent with a model in which the growth of the supermassive black holes is self-regulating, with this
redshift corresponding to the epoch when the accretion-flow phase begins to end and the nuclear activity falls off. |
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| Keywords: | |
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