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K. Marshall, W.N. Brandt (The Pennsylvania State University)
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 \alpha\rm ox. We present results for the ~5% of objects which have \alpha\rm ox\leq -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 \alpha\rm ox can be an effective way of finding objects which have interesting properties, such as broad absorption lines, extreme \ion{Fe}{2} emission, and mergers.