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Title:
The ASCA Catalog of Potential X-Ray Counterparts of GEV Sources
Authors:
Roberts, Mallory S. E.; Romani, Roger W.; Kawai, Nobuyuki
Affiliation:
AA(Department of Physics, Stanford University, Stanford, CA 94305-4060 , ; Current address: Department of Physics, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8, Canada.), AB(Department of Physics, Stanford University, Stanford, CA 94305-4060 , ), AC(Cosmic Radiation Laboratory, Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan)
Publication:
The Astrophysical Journal Supplement Series, Volume 133, Issue 2, pp. 451-465. (ApJS Homepage)
Publication Date:
04/2001
Origin:
UCP
ApJ Keywords:
Gamma Rays: Observations, Stars: Pulsars: General, Stars: Wolf-Rayet, ISM: Supernova Remnants, X-Rays
DOI:
10.1086/320352
Bibliographic Code:
2001ApJS..133..451R

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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