A new method of measuring angular diameter distances, and hence H_0_ and q_0_, by means of X-ray observations of galaxy clusters is proposed. It resembles the method which combines maps of X-ray continuum emission with maps of the Sunyaev-Zeldovich effect, but substitutes measurements of X-ray absorption lines in the spectra of background quasars for the Sunyaev-Zeldovich effect. When the high resolution permitted by the AXAF microcalorimeter becomes available, this method should yield results with significantly smaller uncertainty.
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Krolik et al. (1988) studied this question.