Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-03
Astron.Astrophys. 420 (2004) L23
Astronomy and Astrophysics
Astrophysics
4 pages, Latex2e, Accepted for publication in Astronomy and Astrophysics Letters, corrected some typos
Scientific paper
10.1051/0004-6361:20040157
Narrow-Line Seyfert 1 galaxies (NLS1s) and Narrow-Line quasars (NLQs) seem to amount to ~ 10-30 % of active galactic nuclei (AGNs) in the local universe. Together with their average accretion rate, we argue that the black hole (BH) growth by factor of 8-800 happens in these super-Eddington accretion phase of AGNs. Moreover, there is a possible, systematic underestimation of accretion rates (in the Eddington unit) due to an overestimation of BH mass by massive accretion discs for super-Eddington objects. If it is true, the factor of BH growth above may be larger by order(s) of magnitude. In contrast, the growth factor expected in sub-Eddington phase is only ~ 2. Therefore, the cosmic BH growth by accretion is likely dominated by super-Eddington phase, rather than sub-Eddington phase which is the majority among AGNs. This analysis is based on the fraction and the average accretion rate of NLS1s and NLQs obtained for z ~< 0.5. If those numbers are larger at higher redshift (where BHs were probably less grown), super-Eddington accretion would be even more important in the context of cosmic BH growth history.
Aoki Kaori
Collin Suzy
Kawaguchi Toshihiro
Ohta Kazutoshi
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