|Title||A XMM-Newton monitoring of a candidate changing-look Compton thick AGN|
|Author||Dr Stefano Marchesi|
|Description||Studies of heavily obscured active galactic nuclei (AGN) suggest that the torus that causes the obscuration is patchy, rather than uniform. The line-of-sight column density (NH_los) of the obscuring material should vary over weeks to months, but such an evidence has been observed only in a few X-ray detected AGN, due to lack of large samples of heavily obscured AGN with multi-epoch observations. We propose for a XMM monitoring of NGC 1358, a nearby Compton thick (CT-) AGN with small torus covering factor and NH_los significantly larger than the torus average column density. Through this monitoring, we expect to measure significant variability in NH_los and detect a transition from CT- to Compton thin, thus improving our knowledge on the properties of the obscuring material surrounding AGN.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2023-02-24T00:00:00Z, 089070, 19.17_20220121_1250. https://doi.org/esa-[xxxxxxx]|