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Gamma-Ray Emission From Two Blazars Behind The Galactic Plane: B2013+370 And B2023+336

Journal Article · · The Astrophysical Journal
 [1];  [1];  [2];  [1];  [3];  [4];  [5];  [1];  [2];  [2]
  1. Columbia Univ., New York, NY (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  3. Ohio Univ., Athens, OH (United States)
  4. Ecole Polytechnique, Palaiseau (France)
  5. Columbia Univ., New York, NY (United States). Columbia Astrophysics Lab.
+ Show Author Affiliations
B2013+370 and B2023+336 are two blazars at low-galactic latitude that were previously proposed to be the counterparts for the EGRET unidentified sources 3EG J2016+3657 and 3EG J2027+3429. Gamma-ray emission associated with the EGRET sources has been detected by the Fermi Gammaray Space Telescope, and the two sources, 1FGL J2015.7+3708 and 1FGL J2027.6+3335, have been classified as unidentified in the 1-year catalog. This analysis of the Fermi-LAT data collected during 31 months reveals that the 1FGL sources are spatially compatible with the blazars, and are significantly variable, supporting the hypothesis of extragalactic origin for the gamma-ray emission. The gammaray light curves are compared with 15 GHz radio light curves from the 40-m telescope at the Owens Valley Radio Observatory (OVRO). Simultaneous variability is seen in both bands for the two blazar candidates. The study is completed with the X-ray analysis of 1FGL J2015.7+3708 using Swift observations that were triggered in August 2010 by a Fermi-detected are. The resulting spectral energy distribution shows a two-component structure typical of blazars. We also identify a second source in the field of view of 1FGL J2027.6+3335 with similar characteristics to the known LAT pulsars. This study gives solid evidence favoring blazar counterparts for these two unidentified EGRET and Fermi sources, supporting the hypothesis that a number of unidentified gamma-ray sources at low galactic latitudes are indeed of extragalactic origin.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1356760
Alternate ID(s):
OSTI ID: 22011689
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 746; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

VLBA observations of a rare multiple quasar imaging event caused by refraction in the interstellar medium journal July 2013
SEARCH FOR GAMMA-RAY-EMITTING ACTIVE GALACTIC NUCLEI IN THE FERMI -LAT UNASSOCIATED SAMPLE USING MACHINE LEARNING journal January 2014
The presence of interstellar scintillation in the 15 GHz interday variability of 1158 OVRO-monitored blazars journal September 2019
HESS J1943+213: An Extreme Blazar Shining through the Galactic Plane text January 2018
An Investigation of the Interstellar Environment of Supernova Remnant CTB87 journal June 2018
HESS J1943+213: An Extreme Blazar Shining through the Galactic Plane journal July 2018
HESS J1943+213: An Extreme Blazar Shining Through The Galactic Plane text January 2018
The presence of interstellar scintillation in the 15 GHz interday variability of 1158 OVRO-monitored blazars text January 2019

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79 ASTRONOMY AND ASTROPHYSICS