BLR sizes and the X-ray spectrum in AGN
| dc.creator | Wandel, Amri | |
| dc.creator | Boller, Thomas | |
| dc.date | 1997-11-06 | |
| dc.date.accessioned | 2026-07-07T02:24:56Z | |
| dc.date.available | 2026-07-07T02:24:56Z | |
| dc.description | Recent ROSAT studies of narrow-line Seyfert 1 galaxies revealed these objects (with FWHM $H_β \le 2000 km s^{-1}$) generally show steeper soft X-ray spectra than broad line Seyfert 1's and that there are no AGN with broad lines and steep X-ray spectra. We derive a simple theoretical model which explains the observed correlation between the line width and the spectral index for Seyfert 1 galaxies by assuming the line width is due to gravitational velocity dispersion and showing that steeper soft X-ray spectra yield larger BLR radii. We test the model over a hetrogeneous (normal and narrow-line) sample of some 50 AGN finding a good agreement with the data. We give empirical relations for the dependence of the line width and Eddington ratio on the X-ray luminosity and apply variability analyses for direct estimation of the mass part in the line width. | |
| dc.description | 7 page latex, 8 figs (ps). Also available at http://shum.cc.huji.ac.il/~amri/papers, accepted by A&A | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9711047 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9711047 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/11750 | |
| dc.subject | Astrophysics | |
| dc.title | BLR sizes and the X-ray spectrum in AGN | |
| dc.type | text |