A Survey of Soft X-ray Weak Quasi-Stellar Objects

Details A Survey of Soft X-ray Weak Quasi-Stellar Objects A Survey of Soft X-ray Weak Quasi-Stellar Objects

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.1710m&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #17.10; Bulletin of the American Astronomical Society, Vol. 31, p.1399

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Scientific paper

Although X-ray emission appears to be a universal property of QSOs, there is still considerable diversity in the strength of this emission. One particular class of objects, Soft X-ray Weak Quasi-Stellar Objects (SXW QSOs), show 10--30 times weaker X-ray emission than other comparable QSOs. We present results of a search for SXW QSOs, using the optical-to-X-ray power-law slope α ox. We present results for the 5% of objects which have α ox<= -2.0, indicating soft X-ray weakness. An analysis of the X-ray and UV data for these objects is also presented, with particular attention paid to absorption properties. Conclusions are drawn as to how selection upon α ox can be an effective way of finding objects which have interesting properties, such as broad absorption lines, extreme Fe 2 emission, and mergers.

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