arxiv: 0704.1300 · v1 · submitted 2007-04-10 · 🌌 astro-ph

The obscured X-ray source population in the HELLAS2XMM survey: the Spitzer view

C. Vignali (1 , 2) , Francesca Pozzi (1) , A. Comastri (2) , L. Pozzetti (2) , M. Mignoli (2) , C. Gruppioni (2) , G. Zamorani (2)

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C. Lari (3) F. Civano (1) M. Brusa (4) F. Fiore (5) R. Maiolino (5) ((1) Dipartimento di Astronomia Universita' di Bologna Italy; (2) INAF - Osservatorio Astronomico di Bologna Italy; (3) INAF - Istituto di Radioastronomia (IRA) Bologna Italy; (4) MPE Garching Germany; (5) INAF - Osservatorio Astronomico di Roma Monteporzio-Catone (RM) Italy)

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keywords blackdatahellas2xmmlargeobscuredquasarsspitzersurvey

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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 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.

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The obscured X-ray source population in the HELLAS2XMM survey: the Spitzer view

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