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   PR # 42054
   The soft X-ray transient Aquila X-1, due to its proximity and low
   absorption, has now been unambiguously identified several times as a
   source of X-rays in quiescence with the ROSAT PSPC and HRI. The
   quiescent spectrum, poorly constrained, appears distinctly different
   from the outburst spectrum. No observations have been obtained of Aql
   X-1 with the energy range and resolution necessary to determine the
   quiescent-state emission shape. We plan a single pointing. If in
   quiescence (highly likely), ASCA will observe the soft X-ray
   components and may reveal harder emission, as found in Cen X-4,
   perhaps from separate surface or shock-driven emission. If in
   outburst, we will use simultaneous BATSE data, which has already
   shown a hard X-ray component, to model the broad-band spectrum.
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