| Name | 020066 |
| Title | SEARCHING FOR 'CHANGING LOOK. SEYFERT GALAXIES |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0200660101 |
| DOI | https://doi.org/10.5270/esa-c33dh8g |
| Author | European Space Agency |
| Description | With the aim of discovering more sources which change their appearance from Compton--thin (if Seyfert 2s) or unabsorbed (if Seyfert 1s) to reflection--dominated, we propose to observe, for 10 ks each, four objects which have been proposed to be the optical counterparts of X--ray sources in the Grossan LMA HEAO1 catalog. The four candidate counterparts have been later on observed with imaging X-ray instruments, and found on those occasions to be much fainter. The XMM- Newton observations, if catching the sources at much brighter fluxes than during the previous hard X--ray imaging observations, would confirm their transient nature. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2004-06-02T14:52:45Z/2004-09-21T01:23:33Z |
| 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 | 2005-10-20T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2005, Searching For 'Changing Look. Seyfert Galaxies, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-c33dh8g |