The ASCA Catalog of Potential X-Ray Counterparts of GeV Sources

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 $\sim 85$ of the 95% confidence position contour for 28 of the 30 sources with $>1$ GeV fluxes above $4\times 10^{-8}$ ph ${\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$. We find an excess of hard X-ray sources with $F_{2-10 keV} \ga 10^{-12}$ ergs ${\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$ 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.

23 pages, 5 figures, to appear in the Astrophysical Journal Supplements. Colour images and auxilliary files available at http://astro.stanford.edu/~mallory/survey.html

References in corpus (1)

• Multiwavelength Studies of PSR J1420-6048, a Young Pulsar in the Kookaburra

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