A dataset provided by the European Space Agency

Name 020277


DOI https://doi.org/10.5270/esa-s7fjkyw
Description The lack of X-ray-selected obscured AGN with QSO-like luminosities appears to be at odds both with models of the Cosmic X-ray Background, and our understanding of AGN unification. A likely reason for the absence of these objects is that they suffer Compton-thick absorption and therefore fall below the survey flux limits. This explanation requires a bimodal distribution of absorption columns which is not seen in lower luminosity Seyfert galaxies. However, the receding torus model can explain why the bimodality only appears in luminuos objects. We propose to test this model by observing a carefully selected sample of obscured luminous radio-loud AGN, primarily to measure their photoelectric absorption column densities, and hence determine whether they all have Compton thick tori.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2005-02-01T19:41:10Z/2005-02-02T05:18:04Z
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 2006-02-23T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2006-02-23T00:00:00Z, 020277, 17.56_20190403_1200. https://doi.org/10.5270/esa-s7fjkyw