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Discovery of a Hand X-Ray Source, SAX J0635+0533, in the Error Box of the Gamma-Ray Source 2EG J0635+0521We have discovered an X-ray source, SAX J0635+0533, with a hard spectrum within the error box of the GeV gamma-ray source in Monoceros, 2EG J0635+0521. The unabsorbed flux from the source is 1.2 x 10(exp -11) ergs /sq cm s in the 2-10 keV band. The X-ray spectrum is consistent with a simple power-law model with absorption. The photon index is 1.50 +/- 0.08, and we detect emission out to 40 keV. Optical observations identify a counterpart with a V magnitude of 12.8. The counterpart has broad emission lines and the colors of an early B-type star. If the identification of the X-ray/optical source with the gamma-ray source is correct, then the source would be a gamma-ray-emitting X-ray binary.
Document ID
Document Type
Reprint (Version printed in journal)
Kaaret, P.
(Columbia Univ. New York, NY United States)
Piraino, S.
(Columbia Univ. New York, NY United States)
Halpern, Jules P.
(Columbia Univ. New York, NY United States)
Eracleous, M.
(Columbia Univ. New York, NY United States)
Oliversen, Ronald
Date Acquired
August 20, 2013
Publication Date
May 1, 2001
Publication Information
Publication: The New X-Ray/Gamma-Ray Pulsars
Subject Category
Space Radiation
Funding Number(s)
Distribution Limits

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