Other
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004xmm..prop...31s&link_type=abstract
XMM-Newton Proposal ID #03008901
Other
Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Pg 0043+039, Xmm-Newton Proposal 03008901
Scientific paper
About 10% of the quasars are soft X-ray-weak: its X-ray emission is by a factor 10-30 fainter than in typical quasars. Different observational parameters suggest that absorption is the primary cause of their X-ray weakness, but a uniform absorbing screen cannot explain the X-ray and ultraviolet emission. Our previous XMM-Newton observations of three quasars confirm that their weakness is related to absorption. However, our data show an absorbing column density and ionization parameter, which are much higher than detected for other AGNs. We propose to observe the last two outstanding X-ray weak quasars of the complete sample of Brand, Laor and Wills et al. (2000), which will allow to rigorously study the X-ray absorption scenario in X-ray weak quasars.
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