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2005MNRAS.359.1469M - Mon. Not. R. Astron. Soc., 359, 1469-1480 (2005/June-1)
MCG-6-30-15: long time-scale X-ray variability, black hole mass and active galactic nuclei high states.
McHARDY I.M., GUNN K.F., UTTLEY P. and GOAD M.R.
Abstract (from CDS):
Although, in the X-ray band, it is one of the best observed Seyfert galaxies, there has as yet been no accurate determination of the mass of the black hole in MCG-6-30-15. Here we present a mass determination using the velocity dispersion (MBH-σ*) technique and compare it with estimates based on the width of the Hα line. Depending on the calibration relationship assumed for the MBH-σ* relationship, we derive a mass of between 3.6 and 6x106M☉, consistent with the mass derived from the PSD.
Using the newly derived mass and break time-scale, and revised reverberation masses for other active galactic nuclei (AGN) from Peterson et al., we update the black hole mass-break-time-scale diagram. The observations are still generally consistent with narrow-line Seyfert 1 galaxies having shorter break time-scales, for a given mass, than broad-line AGN, probably reflecting a higher accretion rate. However, the revised, generally higher, masses (but unchanged break time-scales) are also consistent with perhaps all of the X-ray bright AGN studied so far being high-state objects. This result may simply be a selection effect, based on their selection from high-flux X-ray all-sky catalogues, and their consequent typically high X-ray/radio ratios, which indicate high-state systems.
Abstract Copyright: 2005 RAS
Journal keyword(s): black hole physics - galaxies: active - galaxies: individual: MCG-6-30-15 - X-rays: binaries - X-rays: galaxies
Simbad objects: 14
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