Physics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop...74p&link_type=abstract
XMM-Newton Proposal ID #06718601
Physics
Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, 1Es 1927+654
Scientific paper
We propose a simultaneous XMM-Newton and TNG optical and Near-Infrared observation of 1ES 1927+654, a type 2 Seyfert galaxy with no X-ray absorption. The ROSAT and Chandra observations of this source revealed persistent, rapid and large scale variations requiring the line-of-sight to the nucleus to be free from absorption. However, the optical spectrum is typical of Seyfert 2 galaxies. Notably, the measured intrinsic neutral X-ray column density is not enough to obscure the broad-line region. Simultaneous XMM-Newton, optical and Near-Infrared observations are mandatory to confirm the lack of broad emission lines and the lack of X-ray absorption, excluding variability issues. The lack of a BLR in this bright AGN will be difficult to be interpreted within the current Unified Models.
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