Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-12-13
Astrophys.J.Suppl. 133 (2001) 451-466
Astronomy and Astrophysics
Astrophysics
23 pages, 5 figures, to appear in the Astrophysical Journal Supplements. Colour images and auxilliary files available at htt
Scientific paper
10.1086/320352
We present a catalog of 2-10 keV ASCA Gas Imaging Spectrometer images of fields containing bright sources of GeV emission. The images cover $\sim 85%$ of the 95% confidence position contour for 28 of the 30 sources with $> 1$ GeV fluxes above $4\times 10^{-8}$ ph ${\rm cm}^{-2} {\rm s}^{-1}$. We find an excess of hard X-ray sources with $F_{2-10 keV} \ga 10^{-12}$ ergs ${\rm cm}^{-2} {\rm s}^{-1}$ positionally coincident with unidentified sources of GeV emission. We comment on radio-loud and radio-quiet pulsar candidates, as well as several SNR and massive binaries as possible sources of the GeV emission. We also find evidence for a class of variable $\gamma-$ray sources associated with extended regions of hard X-ray emission, and propose that for these sources, a significant percentage of the $\gamma-$ray emission is generated in synchrotron nebulae surrounding fast, young pulsars.
Kawai Nobuyuki
Roberts Mallory S. E.
Romani Roger W.
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