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Date and Time of the Query: 2019-08-18 T02:57:20 PDT
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For refcode 2006A&A...455..173P:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2006A&A...455..173P On the X-ray, optical emission line and black hole mass properties of local Seyfert galaxies F. Panessa; L. Bassani; M. Cappi; M. Dadina; X. Barcons; F. J. Carrera; L. C. Ho; K. Iwasawa Received 23 January 2006 / Accepted 4 May 2006 We investigate the relation between X-ray nuclear emission, optical emission line luminosities and black hole masses for a sample of 47 Seyfert galaxies. The sample, which has been selected from the Palomar optical spectroscopic survey of nearby galaxies (Ho et al. 1997a, ApJS, 112, 315), covers a wide range of nuclear powers, from L_2-10keV_ ~ 10^43^ erg/s down to very low luminosities (L_2-10keV_ ~ 10^38^ erg/s). Best available data from Chandra, XMM-Newton and, in a few cases, ASCA observations have been considered. Thanks to the good spatial resolution available from these observations and a proper modeling of the various spectral components, it has been possible to obtain accurate nuclear X-ray luminosities not contaminated by off-nuclear sources and/or diffuse emission. X-ray luminosities have then been corrected taking into account the likely candidate Compton thick sources, which are a high fraction (>30%) among type 2 Seyferts in our sample. The main result of this study is that we confirm strong linear correlations between 2-10 keV, [OIII]{lambda}5007, H_{alpha}_ luminosities which show the same slope as quasars and luminous Seyfert galaxies, independent of the level of nuclear activity displayed. Moreover, despite the wide range of Eddington ratios (L/L_Edd_) tested here (six orders of magnitude, from 0.1 down to ~ 10^-7^), no correlation is found between the X-ray or optical emission line luminosities and the black hole mass. Our results suggest that Seyfert nuclei in our sample are consistent with being a scaled-down version of more luminous AGN. Key words: accretion, accretion disks, X-rays: galaxies, galaxies: Seyfert, galaxies: nuclei
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