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The quasar relation through cosmic time - II. Evidence for evolution fromz = 3to the present age
- Source :
- Monthly Notices of the Royal Astronomical Society. 402:2453-2461
- Publication Year :
- 2010
- Publisher :
- Oxford University Press (OUP), 2010.
-
Abstract
- We study the dependence of the M_bh - M_host relation on the redshift up to z=3 for a sample of 96 quasars the host galaxy luminosities of which are known. Black hole masses were estimated assuming virial equilibrium in the broad line regions (Paper I), while the host galaxy masses were inferred from their luminosities. With this data we are able to pin down the redshift dependence of the M_bh - M_host relation along 85 per cent of the Universe age. We show that, in the sampled redshift range, the M_bh - L_host relation remains nearly unchanged. Once we take into account the aging of the stellar population, we find that the M_bh / M_host ratio (Gamma) increases by a factor ~7 from z=0 to z=3. We show that Gamma evolves with z regardless of the radio loudness and of the quasar luminosity. We propose that most massive black holes, living their quasar phase at high-redshift, become extremely rare objects in host galaxies of similar mass in the Local Universe.
- Subjects :
- Physics
Stellar population
Astrophysics::High Energy Astrophysical Phenomena
media_common.quotation_subject
Astronomy and Astrophysics
Quasar
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Redshift
Galaxy
Universe
Luminosity
Black hole
Space and Planetary Science
Astrophysics::Galaxy Astrophysics
Line (formation)
media_common
Subjects
Details
- ISSN :
- 13652966 and 00358711
- Volume :
- 402
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi...........2631822e07796208cddcca8fb9085444