X-ray weak broad-line quasars: absorption or intrinsic X-ray weakness ?

Details X-ray weak broad-line quasars: absorption or intrinsic X-ray weakness ? X-ray weak broad-line quasars: absorption or intrinsic X-ray weakness ?

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop..239r&link_type=abstract

XMM-Newton Proposal ID #04066103

Other

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Hs 1036+4008, Hs 1111+4033, Hs 1251+2636, Xmm-Newton Proposal 04066103

Scientific paper

We propose seven short observations of X-ray weak quasars, with the aim of understanding the origin of their low X-ray to optical ratio. The sources belong to the spectroscopically selected Hamburg Quasar Survey, and have been observed with Chandra and in the optical. They show unusual optical properties (most of them have a red continuum and very high EW broad emission lines), while the nature of their X-ray weakness (intrinsic or due to absorption ?) is not yet clear, because of the low signal-to-noise of the Chandra spectra. Four short observations with XMM-Newton gave the answer for four sources, showing absorption in two cases, and an unabsorbed spectrum in the other two. This shows that XMM-Newton can unveil the nature of the X-ray emission of these sources.

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