3EG J2016 + 3657: Confirming an EGRET blazar behind the Galactic plane

J. P. Halpern, M. Eracleous, R. Mukherjee, E. V. Gotthelf

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1016-1023
Number of pages8
JournalAstrophysical Journal
Volume551
Issue number2 PART 1
DOIs
StatePublished - Apr 20 2001

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crab
radio
energy
rays
crabs
cataclysmic variables
supernova remnants
falling
photometry
x rays

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Halpern, J. P. ; Eracleous, M. ; Mukherjee, R. ; Gotthelf, E. V. / 3EG J2016 + 3657 : Confirming an EGRET blazar behind the Galactic plane. In: Astrophysical Journal. 2001 ; Vol. 551, No. 2 PART 1. pp. 1016-1023.
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Halpern, JP, Eracleous, M, Mukherjee, R & Gotthelf, EV 2001, '3EG J2016 + 3657: Confirming an EGRET blazar behind the Galactic plane', Astrophysical Journal, vol. 551, no. 2 PART 1, pp. 1016-1023. https://doi.org/10.1086/320238

3EG J2016 + 3657 : Confirming an EGRET blazar behind the Galactic plane. / Halpern, J. P.; Eracleous, M.; Mukherjee, R.; Gotthelf, E. V.

In: Astrophysical Journal, Vol. 551, No. 2 PART 1, 20.04.2001, p. 1016-1023.

Research output: Contribution to journalArticle

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