A dataset provided by the European Space Agency

Name 020206
Title THE NATURE OF SOFT X-RAY WEAK QSOS
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0202060101
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0202060201

DOI 10.5270/esa-puwijkf
Author Dr NORBERT SCHARTEL
Description About 10% of the quasars can be classified as soft X-ray-weak, whose X-ray emission is by a factor 10-30 fainter than in typical quasars. They show a strong correlation between Alpha(OX) and the C IV absorption equivalent width, which suggest that absorption is the primary cause of their soft X-ray- weakness. But the shape of the correlation can not be reproduced by an uniform screen covering both the X-ray source and the ultraviolet emission. Therefore either the UV and X-ray absorbers are not identical (warm absorber, partly covered, only scattered flux) or the X-ray weakness is due to a peculiar property of the nuclear emission, as extreme variability or unusual steepness.
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Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2004-12-31T01:12:42Z/2005-05-08T14:38:50Z
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 2006-06-15T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2006-06-15T00:00:00Z, 020206, 17.56_20190403_1200. https://doi.org/10.5270/esa-puwijkf