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  • 1
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    Multiwavelength Examination of the COS B Field 2CG 075+00 Yields a Blazar Identification for 3EG J2016+3657 (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: We present a high-energy study of the intriguing COS B gamma-ray field, 2CG 075+00, in order to search for possible counterparts. New EGRET data show that the COS B emission probably corresponds to two localized gamma-ray sources, 3EG J2016+3657 and 3EG J2021+3716. Spectral fits to these EGRET sources, assuming a power-law model, yield photon indices of approx. 2 for each object. We examine archival ROSAT and ASCA X-ray data that overlap both EGRET error boxes and find several point sources in the region to a flux limit of approximately 6.5 x 10(exp -13) ergs/sq cm s. We conclude that the most probable candidate for 3EG J2016+3657 is the compact, variable, flat-spectrum radio and millimeter source B2013+370 (G74.87+1.22), which has blazar like properties. The other source, 3EG J2021+3716, remains unidentified.
    Keywords: Space Radiation
    Type: The New X-Ray/Gamma-Ray Pulsars; 13; CAL-3332
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  • 2
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    Discovery of a Nonblazar Gamma-Ray Transient Source Near the Galactic Plane: GRO J1838-04 (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: We report the discovery of a remarkable gamma-ray transient source near the Galactic plane, GRO J1838-04. This source was serendipitously discovered by EGRET in 1995 June with a peak intensity of approx. (4 +/- 1) x 10(exp -6) photons/sq cm s (for photon energies larger than 100 MeV) and a 5.9 sigma significance. At that time, GRO J1838-04 was the second brightest gamma-ray source in the sky. A subsequent EGRET pointing in 1995 late September detected the source at a flux smaller than its peak value by a factor of approx. 7. We determine that no radio-loud spectrally flat blazar is within the error box of GRO J1838-04. We discuss the origin of the gamma-ray transient source and show that interpretations in terms of active galactic nuclei or isolated pulsars are highly problematic. GRO J1838-04 provides strong evidence for the existence of a new class of variable gamma-ray sources.
    Keywords: Space Radiation
    Type: The New X-Ray/Gamma-Ray Pulsars; 6; CAL-3332
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  • 3
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    Identification of the Periodic Hard X-Ray Transient GRO J1849-03 with the X-Ray Pulsar GS 1843-02 = X1845-024: A New Be/X-Ray Binary (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: We identify the periodic transient hard X-ray source GRO J1849-03 with the transient x-ray pulsar GS 1843-02 = X1845-024 based on the detection of x-ray outbursts from X1845-024 coincident with hard x-ray outbursts of GRO J1849-03. Based on its spin period of 94.8 s and its orbital period of 241 days, we classify the system as a Be/X-ray binary.
    Keywords: Space Radiation
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  • 4
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    X-ray and Gamma-ray Observations of the COS-B Field 2CG 075+00 (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We present a summary of gamma-ray and X-ray observations of the intriguing COS-B field, 2CG 075+00, in order to search for potential counterparts. The third EGRET (Energetic Gamma Ray Experiment Telescope) (3EG) catalog shows that the COS-B emission corresponds to at least two localized gamma-ray sources, 3EG 2016+3657 and 3EG J2021+3716. We present analyses of archival X-ray fields which overlap error boxes of both the EGRET sources.
    Keywords: Space Radiation
    Type: Sep 15, 1999 - Sep 17, 1999; Portsmouth, NH; United States|EGRET Team Papers to be Published in the Proceedings of the Fifth Compton Symposium
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