Discovery of a hard X-ray source, SAX J0635 + 0533, in the error box of the gamma-ray source 2EG 0635 + 0521

Philip Kaaret; Santina Piraino; Jules Halpern; Michael Eracleous

doi:10.1086/307711

Discovery of a hard X-ray source, SAX J0635 + 0533, in the error box of the gamma-ray source 2EG 0635 + 0521

Philip Kaaret, Santina Piraino, Jules Halpern, Michael Eracleous

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33 Scopus citations

Abstract

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 flux from the source is 1.2 × 10^-11 ergs cm^-2 s^-1 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.

Original language	English (US)
Pages (from-to)	197-202
Number of pages	6
Journal	Astrophysical Journal
Volume	523
Issue number	1 PART 1
DOIs	https://doi.org/10.1086/307711
State	Published - Sep 20 1999

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/307711

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title = "Discovery of a hard X-ray source, SAX J0635 + 0533, in the error box of the gamma-ray source 2EG 0635 + 0521",

abstract = "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 flux from the source is 1.2 × 10-11 ergs cm-2 s-1 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.",

author = "Philip Kaaret and Santina Piraino and Jules Halpern and Michael Eracleous",

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T1 - Discovery of a hard X-ray source, SAX J0635 + 0533, in the error box of the gamma-ray source 2EG 0635 + 0521

AU - Kaaret, Philip

AU - Piraino, Santina

AU - Halpern, Jules

AU - Eracleous, Michael

PY - 1999/9/20

Y1 - 1999/9/20

N2 - 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 flux from the source is 1.2 × 10-11 ergs cm-2 s-1 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.

AB - 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 flux from the source is 1.2 × 10-11 ergs cm-2 s-1 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.

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JF - Astrophysical Journal

IS - 1 PART 1

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Discovery of a hard X-ray source, SAX J0635 + 0533, in the error box of the gamma-ray source 2EG 0635 + 0521

Abstract

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