ASCA Observations of NLS1s: BH Mass Estimation from X-ray Variability and X-ray Spectra

Details ASCA Observations of NLS1s: BH Mass Estimation from X-ray Variability and X-ray Spectra ASCA Observations of NLS1s: BH Mass Estimation from X-ray Variability and X-ray Spectra

2000-05-08

arxiv.org/abs/astro-ph/0005128v1

New Astron.Rev. 44 (2000) 419-422

Astronomy and Astrophysics

Astrophysics

Contributed talk presented at the Joint MPE,AIP,ESO workshop on NLS1s, Bad Honnef, Dec. 1999, to appear in New Astronomy Revie

Scientific paper

10.1016/S1387-6473(00)00071-3

ASCA observations of Narrow-Line Seyfert 1 galaxies (NLS1s) are presented. We focus on the black hole size of the NLS1 sources by employing two independent methods for the mass estimation; one is using X-ray variability, the other is using a blackbody fit to the soft component. Although the coincidence is not good for some sources, the mass estimated by these methods ranges from 1e5 to 1e7 solar masses, systematically smaller than those for typical (broad line) Seyfert 1. We consider the small mass black hole to be the principal cause of the several extreme characteristics of the NLS1s.

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