| Name | 020177 |
| Title | TRANSMISSIOM- TO REFLECTION-DOMINATED SPECTRA TRANSITION IN SEYFERT 2 GALAXIES |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0201770201 |
| DOI | https://doi.org/10.5270/esa-ah9v5am |
| Author | European Space Agency |
| Description | Reflection-dominated Seyfert 2 galaxies are usually interpreted in terms of an active nucleus covered by a Compton-thick absorber. However, recently discovered transitions between reflection- and transmission-dominated (Compton-thin) states are more convincingly explained as changes in the activity level of the Active Galactic Nucleus (AGN). In order to quantitatively address this issue, we propose to complete the observations of an optically defined, complete and unbiased sample of Compton-thick Seyfert 2 galaxies, to measure on a sound statistical basis the rate of reflection- to transmission-dominated state transitions. This requires the observation of still 3 objects - priority C targets for the AO2 - for a total allocation time of 60 ks. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2005-02-20T17:03:32Z/2005-02-21T00:18:48Z |
| Version | 17.56_20190403_1200 |
| 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2006-07-08T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2006, Transmissiom- To Reflection-Dominated Spectra Transition In Seyfert 2 Galaxies, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-ah9v5am |