6533b82efe1ef96bd1293da7
RESEARCH PRODUCT
Discovery of a Hard X‐Ray Source, SAX J0635+0533, in the Error Box of the Gamma‐Ray Source 2EG 0635+0521
Michael EracleousMichael EracleousSantina PirainoJules P. HalpernJules P. HalpernPhilip Kaaretsubject
PhysicsPhotonAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)X-rayGamma rayFOS: Physical sciencesFluxBinary numberAstronomy and AstrophysicsAstrophysicsAstrophysicsSpace and Planetary ScienceEmission spectrumAbsorption (electromagnetic radiation)Astrophysics::Galaxy Astrophysicsdescription
We 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 x-ray flux is 1.2*10^-11 erg cm^-2 s^-1 in the 2-10 keV band. The x-ray spectrum is consistent with a simple powerlaw 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-04-19 | The Astrophysical Journal |