Recent X-ray surveys have provided a large number of high-luminosity, obscured Active Galactic Nuclei (AGN), the so-called Type 2 quasars. Despite the large amount of multi-wavelength supporting data, the main parameters related to the black holes harbored in such AGN are still poorly known. Here we present the preliminary results obtained for a sample of eight Type 2 quasars in the redshift range ~0.9-2.1 selected from the HELLAS2XMM survey, for which we used Ks-band, Spitzer IRAC and MIPS data at 24 micron to estimate bolometric corrections, black hole masses, and Eddington ratios.
Vignali C., Pozzi F., Comastri A., Pozzetti L., Mignoli M., Gruppioni C., et al. (2007). The obscured X-ray source population in the HELLAS2XMM survey: the Spitzer view. NEW YORK : American Institute of Physics.
The obscured X-ray source population in the HELLAS2XMM survey: the Spitzer view
VIGNALI, CRISTIAN;POZZI, FRANCESCA;CIVANO, FRANCESCA MARIA;BRUSA, MARCELLA;
2007
Abstract
Recent X-ray surveys have provided a large number of high-luminosity, obscured Active Galactic Nuclei (AGN), the so-called Type 2 quasars. Despite the large amount of multi-wavelength supporting data, the main parameters related to the black holes harbored in such AGN are still poorly known. Here we present the preliminary results obtained for a sample of eight Type 2 quasars in the redshift range ~0.9-2.1 selected from the HELLAS2XMM survey, for which we used Ks-band, Spitzer IRAC and MIPS data at 24 micron to estimate bolometric corrections, black hole masses, and Eddington ratios.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
