| Proposal ID | 065153 |
| Title | A test for obscuring clouds in the BLR of the changing look Seyfert 1 H0557-385 |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0651530201 |
| DOI | https://doi.org/10.5270/esa-6xmrm5q |
| Principal Investigator, PI | Dr ANNA LIA LONGINOTTI |
| Abstract | 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 ~8*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. |
| Publications |
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| 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2011-12-23T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "yr time scale", "optical spectra", "obscuring gas", "obscuring clouds", "optical lines properties", "xray data", "flux drop", "nuclear source", "optical spectroscopy", "sight clouds", "multi component blr", "warm absorber", "source flux", "`` changing look", "10e23 cm", "xmm data", "h0557 385", "changing look seyfert", "XMM" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | 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 |