2001ApJ...551.1016H -
Astrophys. J., 551, 1016-1023 (2001/April-3)
3EG J2016+3657: confirming an EGRET blazar behind the galactic plane.
HALPERN J.P., ERACLEOUS M., MUKHERJEE R. and GOTTHELF E.V.
Abstract (from CDS):
We recently identified the blazar-like radio source G74.87+1.22 (B2013+370) as the counterpart of the high-energy γ-ray source 3EG J2016+3657 in the Galactic plane. However, since most blazar identifications of EGRET sources are only probabilistic in quality even at high Galactic latitude, and since there also exists a population of unidentified Galactic EGRET sources, we sought to obtain additional evidence to support our assertion that 3EG J2016+3657 is a blazar. These new observations consist of a complete set of classifications for the 14 brightest ROSAT X-ray sources in the error circle, of which B2013+370 remains the most likely source of the γ-rays. We also obtained further optical photometry of B2013+370 itself which shows that it is variable, providing additional evidence of its blazar nature. Interestingly, this field contains, in addition to the blazar, the Crab-like supernova remnant CTB 87, which is too distant to be the EGRET source, and three newly discovered cataclysmic variables, all five of these X-ray sources falling within 16' of each other. This illustrates the daunting problem of obtaining complete identifications of EGRET sources in the Galactic plane.
Abstract Copyright:
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Journal keyword(s):
Gamma Rays: Observations - Stars: Novae, Cataclysmic Variables - Stars: Wolf-Rayet - X-Rays: General
Nomenclature:
Table 1: [MGH2000] NN (Nos 15-19) added.
Errata:
erratum vol. 572, p. 693 (2002)
Simbad objects:
17
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