| Proposal ID | 065387 |
| Title | X-ray monitoring of NGC~4507: X-ray absorption by Broad Line Clouds |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0653870201 |
| DOI | https://doi.org/10.5270/esa-591xtqh |
| Principal Investigator, PI | Dr Guido Risaliti |
| Abstract | We propose a new XMM-Newton monitoring of the X-ray obscured AGN in NGC~4507,with the aim of testing a scenario where the variable X-ray absorption is due tothe broad emission line clouds. The identification of these two components issuggested by our previous monitoring of a few other sources (NGC 1365, NGC 4151,UGC 4203), where rapid X-ray absorption variability, suggestive of an extremelycompact X-ray absorber, has been found by chance. The new campaign we proposeis for the first time based on a precise prediction, rather than on a blindsearch, and will therefore provide a strong test of the general validity of thisnew scheme for the structure of the AGN circumnuclear medium. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2010-06-24T04:09:31Z/2010-08-03T06:59:07Z |
| Version | 21.51_20241115_1113 |
| 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 | 2011-08-21T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "broad line clouds", "ngc 4151", "x ray", "XMM-Newton", "xray obscured agn", "ugc 4203", "blind search", "chance ".", "XMM", "precise prediction", "variable xray absorption", "agn circumnuclear medium", "xray absorption", "NGC", "sources ngc 1365", "xmm newton", "compact xray absorber" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Guido Risaliti, 2011, 'X-ray monitoring of NGC~4507: X-ray absorption by Broad Line Clouds', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-591xtqh |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |