Home > Publications database > VERITAS Discovery of Very High Energy Gamma-Ray Emission from S3 1227+25 and Multiwavelength Observations > print

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024 7 _ |a 10.3847/1538-4357/acd2d0
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024 7 _ |a inspire:2656721
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024 7 _ |a 0004-637X
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024 7 _ |a 1538-4357
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024 7 _ |a arXiv:2305.02860
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024 7 _ |a 10.3204/PUBDB-2023-03993
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037 _ _ |a PUBDB-2023-03993
041 _ _ |a English
082 _ _ |a 520
088 _ _ |a arXiv:2305.02860
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100 1 _ |a Acharyya, A.
|b 0
|e Corresponding author
245 _ _ |a VERITAS Discovery of Very High Energy Gamma-Ray Emission from S3 1227+25 and Multiwavelength Observations
260 _ _ |a London
|c 2023
|b Institute of Physics Publ.
336 7 _ |a article
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336 7 _ |a Journal Article
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336 7 _ |a ARTICLE
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336 7 _ |a Journal Article
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500 _ _ |a 18 pages, 6 figures. Accepted for publication in the Astrophysical Journal (ApJ)
520 _ _ |a We report the detection of very high energy gamma-ray emission from the blazar S3 1227+25 (VER J1230+253) with the Very Energetic Radiation Imaging Telescope Array System (VERITAS). VERITAS observations of the source were triggered by the detection of a hard-spectrum GeV flare on 2015 May 15 with the Fermi-Large Area Telescope (LAT). A combined 5 hr VERITAS exposure on May 16 and 18 resulted in a strong 13σ detection with a differential photon spectral index, Γ = 3.8 ± 0.4, and a flux level at 9% of the Crab Nebula above 120 GeV. This also triggered target-of-opportunity observations with Swift, optical photometry, polarimetry, and radio measurements, also presented in this work, in addition to the VERITAS and Fermi-LAT data. A temporal analysis of the gamma-ray flux during this period finds evidence of a shortest variability timescale of τ$_{obs}$ = 6.2 ± 0.9 hr, indicating emission from compact regions within the jet, and the combined gamma-ray spectrum shows no strong evidence of a spectral cutoff. An investigation into correlations between the multiwavelength observations found evidence of optical and gamma-ray correlations, suggesting a single-zone model of emission. Finally, the multiwavelength spectral energy distribution is well described by a simple one-zone leptonic synchrotron self-Compton radiation model.
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650 _ 7 |a gamma ray: VHE
|2 INSPIRE
650 _ 7 |a gamma ray: emission
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650 _ 7 |a gamma ray: flux
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650 _ 7 |a emission: model
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650 _ 7 |a detector: imaging
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650 _ 7 |a polarization: monitoring
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650 _ 7 |a VERITAS
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650 _ 7 |a GeV
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650 _ 7 |a optical
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650 _ 7 |a correlation
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650 _ 7 |a spectral
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650 _ 7 |a variability
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650 _ 7 |a power spectrum
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650 _ 7 |a blazar
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650 _ 7 |a photon
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650 _ 7 |a spectral energy distribution
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650 _ 7 |a GLAST
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650 _ 7 |a synchrotron
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693 _ _ |0 EXP:(DE-H253)CTA-20150101
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|e Cherenkov Telescope Array
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693 _ _ |0 EXP:(DE-H253)VERITAS-20170101
|5 EXP:(DE-H253)VERITAS-20170101
|e Very Energetic Radiation Imaging Telescope Array System
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700 1 _ |a Adams, C. B.
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700 1 _ |a Archer, A.
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700 1 _ |a Bangale, P.
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700 1 _ |a Benbow, W.
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700 1 _ |a Reynolds, P. T.
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700 1 _ |a Ribeiro, D.
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700 1 _ |a Sadeh, I.
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700 1 _ |a Shang, R.
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700 1 _ |a Splettstoesser, M.
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700 1 _ |a Talluri, A. Kaushik
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700 1 _ |a Tucci, J. V.
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700 1 _ |a Vassiliev, V. V.
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700 1 _ |a Williams, D. A.
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700 1 _ |a Wong, S. L.
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700 1 _ |a Hovatta, Talvikki
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700 1 _ |a Jorstad, Svetlana G.
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700 1 _ |a Kiehlmann, Sebastian
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700 1 _ |a Lähteenmäki, Anne
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700 1 _ |a Liodakis, Ioannis
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700 1 _ |a Marscher, Alan P.
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700 1 _ |a Max-Moerbeck, Walter
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700 1 _ |a Readhead, Anthony C. S.
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700 1 _ |a Reeves, Rodrigo
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700 1 _ |a Smith, Paul S.
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700 1 _ |a Tornikoski, Merja
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700 1 _ |a VERITAS Collaboration
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773 _ _ |a 10.3847/1538-4357/acd2d0
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