The aim of the present proposal to test whether the apparent mismatch betweenX-ray absorption and optical spectral type (attributable to reddening) in someAGN is real or due to changes in he source properties, as predicted by the AGNUnified Scheme. We propose here to complete the quasi-simultaneous -- X-ray/Optical-- observation program of a well-defined sample of Changing TypeSeyferts we started in AO3 and continued to AO6. Besides the simultaneousobservations, we will perform delayed optical spectroscopy to account forpossible time lags between changes in the X-ray source and optical.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2008-08-07T02:28:50Z/2008-08-07T07:22:31Z
Version
17.56_20190403_1200
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.
European Space Agency, Ms Amalia Corral, 2009, 'Changing Type Seyferts galaxies and the AGN Unified Model', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-lgcg3rn
