Physics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop...58b&link_type=abstract
XMM-Newton Proposal ID #02010903
Physics
Mkn 993, Mkn 1018, Mkn 372, Xmm-Newton Proposal 02010903
Scientific paper
The mounting evidence for non-matching AGN spectral type and X-ray absorption is almost invariably based on non-simultaneous optical and X-ray observations. Both properties are known to be variable in some AGN. The aim of the present proposal is to solve the dichotomy on whether both optical and X-ray obscuration are closely related (as predicted by the unified AGN picture) but variable, or else these properties are really mismatched in some objects. We propose XMM-Newton observations, simultaneous to optical spectroscopy, of a representative selection of AGNs whose optical spectral type is known to be variable.
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