A test for obscuring clouds in the BLR of the changing look Seyfert 1 H0557-385

Details A test for obscuring clouds in the BLR of the changing look Seyfert 1 H0557-385 A test for obscuring clouds in the BLR of the changing look Seyfert 1 H0557-385

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop...49l&link_type=abstract

XMM-Newton Proposal ID #06515301

Computer Science

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, H0557-385

Scientific paper

We propose to monitor the extreme ``changing-look" Seyfert 1 H0557-385. We want to probe the short time scale variability of the obscuring gas that varied in previous XMM data. The source was observed in different flux states on a 4 yr time scale. The flux drop can be entirely explained by line-of-sight clouds with Nh ~8*10e23 cm^-2 partially covering the nuclear source. This interpretation is very robust due to the presence of a warm absorber that did not change with the source flux, possibly suggesting a Broad Line Region origin for the clouds. The source has a multi-component BLR, so we will monitor the optical lines properties in a proposal for optical spectroscopy and we will request optical spectra simultaneous to the X-ray data. We request 87 ks to be split in 3 XMM observations.

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