| Proposal ID | 089070 |
| Title | A XMM-Newton monitoring of a candidate changing-look Compton thick AGN |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0890700101 |
| DOI | https://doi.org/10.57780/esa-46p1dkm |
| Principal Investigator, PI | Dr Stefano Marchesi |
| Abstract | Studies of heavily obscured active galactic nuclei (AGN) suggest that the torusthat causes the obscuration is patchy, rather than uniform. The line-of-sightcolumn density (NH_los) of the obscuring material should vary over weeks tomonths, 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-epochobservations. We propose for a XMM monitoring of NGC 1358, a nearby Comptonthick (CT-) AGN with small torus covering factor and NH_los significantly largerthan the torus average column density. Through this monitoring, we expect tomeasure significant variability in NH_los and detect a transition from CT- toCompton thin, thus improving our knowledge on the properties of the obscuring material surrounding AGN. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2021-08-02T14:09:15Z/2022-02-04T18:07:18Z |
| Version | 19.17_20220121_1250 |
| 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 | 2023-02-24T00:00:00Z |
| Last Update | 2025-08-04 |
| Keywords | "XMM", "XMM-Newton", "obscuring material", "multi epoch", "xmm newton", "NGC 1358", "heavily obscured agn", "ngc 1358", "compton thin" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Stefano Marchesi, 2023, 'A XMM-Newton monitoring of a candidate changing-look Compton thick AGN', 19.17_20220121_1250, European Space Agency, https://doi.org/10.57780/esa-46p1dkm |