Abstract
We present a catalog of 2-10 keV ASCA Gas Imaging Spectrometer images of fields containing bright sources of GeV emission. The images cover ∼85% of the 95% confidence position contour for 28 of the 30 sources with >1 GeV fluxes above 4 × 10-8 ph cm-2 s-1. We find an excess of hard X-ray sources with F2-10keV ≳ 10-12 ergs cm-2 s-1 positionally coincident with unidentified sources of GeV emission. We comment on radio-loud and radio-quiet pulsar candidates, as well as several SNRs and massive binaries as possible sources of the GeV emission. We also find evidence for a class of variable γ-ray sources associated with extended regions of hard X-ray emission, and propose that for these sources, a significant percentage of the γ-ray emission is generated in synchrotron nebulae surrounding fast, young pulsars.
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