Ralf Keil | Searcharxiv

arXiv2001

XMM-Newton study of the ULIRG NGC 6240

A recently performed XMM-Newton observation of the ULIRG NGC 6240 clearly indicates the presence of an AGN contribution to its X-ray spectrum. In the 5.0 - 7.0 keV energy range there is a clear signature of the fluorescent Fe K lines at 6.4, 6.7 and 6.9 keV, respectively. The line strength of the 6.4 keV line cannot be produced by a thermal component. The 0.3 - 10.0 keV spectral energy distribution is characterized by the following components: (I) two hot thermal components (the starburst), (II) one direct component (heavily absorbed; AGN is hidden), (III) one reflection component (the AGN), (IV) three narrow Fe lines. The model parameters for the broad-band spectral energy distribution are consistent with the results of previously works.

astro-ph↗

arXiv2000

BLR velocities in optically and X-ray selected AGN samples

We have analyzed optical spectra of 473 X-ray and 235 optically selected AGNs, to study their emission line properties. We present results of an analysis of the H-beta linewidths. We find that the linewidth distribution of quasars is shifted towards higher velocities ( =4300 km s-1) compared to the distribution of Sy 1s ( =3000 km s-1). There are no Narrow Line Quasars, i.e. there are no AGNs with quasar luminosities and FWHM(H-beta) < 2000 km s-1. NLSy1s comprise 20-30 per cent of the AGN population at faint absolute magnitudes (MB>-22), irrespective of the selection method. In the RASS sample we find Gamma [0.1-2.4 keV] < 3.3. The Gamma vs. FWHM(H-beta) distribution for Sy 1 galaxies is consistent with previous work. For QSOs the spectral index also flattens with increasing FWHM(H-beta), but they have larger linewidths than Seyfert 1s.

astro-ph↗