The Piccinotti AGN sample observed in the ROSAT All-Sky Survey.

Details The Piccinotti AGN sample observed in the ROSAT All-Sky Survey. The Piccinotti AGN sample observed in the ROSAT All-Sky Survey.

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...320..696s&link_type=abstract

Astronomy and Astrophysics, v.320, p.696-704

Astronomy and Astrophysics

Astrophysics

32

Galaxies: Active, Galaxies: Seyfert, Galaxies: Quasars, X-Rays: Galaxies

Scientific paper

The ROSAT All-Sky Survey observations of the complete hard X-ray selected Piccinotti AGN sample demonstrate that the soft X-ray spectra of almost none of the sample AGN can be simply represented by the power law extrapolated from the 2-10keV range. A comparison of the soft X-ray spectra of the sample members with their medium energy continua measured with HEAO-1 and EXOSAT revealed that about half of the AGN in the sample are intrinsically absorbed. Furthermore, almost all sample AGN show excess fluxes in their soft X-ray emission. These features in the spectra of active galactic nuclei have an important impact on the interpretation of the cosmic soft X-ray background.

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