We propose to monitor the extreme ..changing-look Seyfert 1 H0557-385. We wantto probe the short time scale variability of the obscuring gas that varied inprevious XMM data. The source was observed in different flux states on a 4 yrtime scale. The flux drop can be entirely explained by line-of-sight clouds withNh virgul8*10e23 cm^-2 partially covering the nuclear source. This interpretation isvery robust due to the presence of a warm absorber that did not change with thesource flux, possibly suggesting a Broad Line Region origin for the clouds. Thesource has a multi-component BLR, so we will monitor the optical linesproperties in a proposal for optical spectroscopy and we will request opticalspectra simultaneous to the X-ray data. We request 87 ks to be split in 3 XMM observations.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2010-10-15T10:12:43Z/2010-10-31T16:27:24Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Dr ANNA LIA LONGINOTTI, 2011, 'A test for obscuring clouds in the BLR of the changing look Seyfert 1 H0557-385', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-6xmrm5q
