AGNs among ROSAT Blank Field Sources

A. Celotti (3); D.-W. Kim (2); F. Nicastro (2) ((1) Universita' dell'insubria; I. Cagnoni (1); Italy); Italy; (2) SAO; J.-S. Huang (2); M. Elvis (2); USA; (3) SISSA-ISAS

arxiv: astro-ph/0212231 · v1 · submitted 2002-12-10 · 🌌 astro-ph

AGNs among ROSAT Blank Field Sources

I. Cagnoni (1) , M. Elvis (2) , D.-W. Kim (2) , J.-S. Huang (2) , A. Celotti (3) , F. Nicastro (2) ((1) Universita' dell'insubria , Italy; (2) SAO , USA; (3) SISSA-ISAS

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keywords agnssourcesx-rayopticalrosatsampleabsorptionagn-like

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We selected a sample of sources with high X-ray over optical flux ratio from the ROSAT PSPC archives. Out of the 16 sources in our sample, one is a (possibly extreme) BL Lac and two are AGNs. Six more sources are tentatively classified as AGNs on the basis of their X-ray properties and of our optical-IR imaging. For one of the AGNs and for the AGN-like blanks we find a discrepancy between the lack of absorption indicated by the X-ray spectra and the presence of red counterparts in their error circles. We discuss various possibilities to reconcile the X-ray and optical information.

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AGNs among ROSAT Blank Field Sources

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