Showing papers by "Bernd Husemann published in 2008"
Abstract: Aims. We searched for the presence of extended emission-line regions (EELRs) around low-redshift QSOs. Methods. We observed a sample of 20 mainly radio-quiet low-redshift quasars ($z 50) nuclear spectra to measure properties such as [$\ion{O}{iii}$]/H β flux ratios, $\ion{Fe}{ii}$ equivalent widths and H β line widths. Results. A significant fraction of the quasars (8/20) show a luminous EELR, with detected linear sizes of several kpc. Whether or not a QSO has a luminous EELR is strongly related with nuclear properties, in the sense that an EELR was detected in objects with low $\ion{Fe}{ii}$ equivalent width and large H β ${\it FWHM}$. The EELRs were detected preferentially in QSOs with larger black hole masses. There is no discernible relation, however, between EELR detection and QSO luminosity and Eddington ratio.
37 citations