Black hole masses in NLS1 galaxies from the X-ray excess variance method

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dc.creatorNikolajuk, M.
dc.creatorGurynowicz, P.
dc.creatorCzerny, B.
dc.date2006-12-14
dc.date.accessioned2026-07-07T07:34:26Z
dc.date.available2026-07-07T07:34:26Z
dc.descriptionWe estimate black hole masses in Narrow Line Seyfert 1 (NLS1) galaxies at the basis of their X-ray excess variance. We apply the standard approach appropriate for Broad Line Seyfert 1 (BLS1) galaxies. In general, we find that the obtained masses are by a factor \sim 20 too small to agree with values obtained from other methods (reverberation, stellar dispersion). However, a small subset of our NLS1 objects does not require that multiplication, or the correction factor is less than 4. We find that this subset have a soft X-ray photon index, Γ_{0.1-2.4 keV}, smaller than 2. We thus postulate that this subclass of NLS1 actually belongs to BLS1.
dc.description2 pages, 2 figurs, Conference proceedings to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M. Wang (San Francisco: ASP), (October 16-21, 2006, Xi'an, China)
dc.identifierhttps://arxiv.org/abs/astro-ph/0612376
dc.identifierhttp://arxiv.org/abs/astro-ph/0612376
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/119766
dc.subjectAstrophysics
dc.titleBlack hole masses in NLS1 galaxies from the X-ray excess variance method
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