Gamma-Ray Emission From Two Blazars Behind The Galactic Plane: B2013+370 And B2023+336
Abstract
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 twomore »
- Authors:
-
- Columbia Univ., New York, NY (United States)
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Ohio Univ., Athens, OH (United States)
- Ecole Polytechnique, Palaiseau (France)
- Columbia Univ., New York, NY (United States). Columbia Astrophysics Lab.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1356760
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 746; Journal Issue: 2; Journal ID: ISSN 0004-637X
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Kara, E., Errando, M., Max-Moerbeck, W., Aliu, E., Böttcher, M., Fortin, P., Halpern, J. P., Mukherjee, R., Readhead, A. C. S., and Richards, J. L. Gamma-Ray Emission From Two Blazars Behind The Galactic Plane: B2013+370 And B2023+336. United States: N. p., 2012.
Web. doi:10.1088/0004-637X/746/2/159.
Kara, E., Errando, M., Max-Moerbeck, W., Aliu, E., Böttcher, M., Fortin, P., Halpern, J. P., Mukherjee, R., Readhead, A. C. S., & Richards, J. L. Gamma-Ray Emission From Two Blazars Behind The Galactic Plane: B2013+370 And B2023+336. United States. https://doi.org/10.1088/0004-637X/746/2/159
Kara, E., Errando, M., Max-Moerbeck, W., Aliu, E., Böttcher, M., Fortin, P., Halpern, J. P., Mukherjee, R., Readhead, A. C. S., and Richards, J. L. Thu .
"Gamma-Ray Emission From Two Blazars Behind The Galactic Plane: B2013+370 And B2023+336". United States. https://doi.org/10.1088/0004-637X/746/2/159. https://www.osti.gov/servlets/purl/1356760.
@article{osti_1356760,
title = {Gamma-Ray Emission From Two Blazars Behind The Galactic Plane: B2013+370 And B2023+336},
author = {Kara, E. and Errando, M. and Max-Moerbeck, W. and Aliu, E. and Böttcher, M. and Fortin, P. and Halpern, J. P. and Mukherjee, R. and Readhead, A. C. S. and Richards, J. L.},
abstractNote = {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.},
doi = {10.1088/0004-637X/746/2/159},
journal = {The Astrophysical Journal},
number = 2,
volume = 746,
place = {United States},
year = {Thu Feb 02 00:00:00 EST 2012},
month = {Thu Feb 02 00:00:00 EST 2012}
}
Web of Science
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