Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..335c&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astrophysics
Scientific paper
Using several samples of quasars and AGNs and assuming that their optical luminosity is emitted by the accretion disc, we show that Narrow Line Seyfert Galaxies 1 (NLS1) accrete at super-Eddington rates, while their luminosity stays of the order of the Eddington limit, in agreement with the "slim disc model". It means that the mass of the supermassive central black holes (BH) increases by one order of magnitude in less than 10**8 years. We suggest that the BHs of these galaxies are in the process of formation, in agreement with recent claims that the BHs of NLS1s are undermassive with respect to the host bulge masses. Since these galaxies represent at least 10% of active galaxies up to at least a redshift of 0.5, these active phases should play an important role in shaping the mass function of local BHs, and possibly also in the early stage of BH formation.
Collin Suzy
Kawagachi Toshihiro
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