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.
The obscured X-ray source population in the HELLAS2XMM survey: the Spitzer view / Vignali C.; Pozzi F.; Comastri A.; Pozzetti L.; Mignoli M.; Gruppioni C.; Zamorani G.; Lari C.; Civano F.; Brusa M.; Fiore F.; Maiolino R.. - STAMPA. - 924:(2007), pp. 864-869. (Intervento presentato al convegno The multicoloured landscape of compact objects and their explosive origin tenutosi a Cefalu nel 11-24 giugno 2006).
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.
