Highly obscured quasarvirgul2 have been proposed as the main contributorsto the hard X-ray background. Despite years of searches only anhandful of such sources is known. We propose to observe with XMM asample of 9 relatively bright (F(5-10 keV)=2-10E-13 cgs) .High EnergyLLarge Area Survey. (HELLAS) X-ray sources, discovered by the BeppoSAXMECS in the hard X-ray band 5-10 keV. We selected the sourcesaccording to two criteria: a) highest hardness ratio in the 2-10 keVband; highest ratio between the MECS 5-10 band and the ROSAT 0.5-2 keVband. This should select obscured sources in which the nucleus
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2001-02-28T23:52:04Z/2002-01-03T18:53:24Z
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, Dr Fabrizio Fiore, 2003, 'Chasing quasar 2 with XMM', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-bvcdzbq
