Journal Article

PUBDB-2023-03993

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png VERITAS Discovery of Very High Energy Gamma-Ray Emission from S3 1227+25 and Multiwavelength Observations

Acharyya, A. (Corresponding author) ; Adams, C. B. ; Archer, A. ; Bangale, P. ; Benbow, W. ; Brill, A. ; Christiansen, J. L. ; Chromey, A. J. ; Errando, M. ; Falcone, A. ; Feng, Q. ; Finley, J. P. ; Foote, G. M. ; Fortson, L. ; Furniss, A. ; Gallagher, G. ; Hanlon, W. ; Hanna, D. ; Hervet, O. ; Hinrichs, C. E. ; Hoang, J. ; Holder, J. ; Jin, W. ; Johnson, M. N. ; Kaaret, P. ; Kertzman, M. ; Kieda, D. ; Kleiner, T. K. ; Korzoun, N. ; Krennrich, F. ; Lang, M. J. ; Lundy, M. ; Maier, G.DESY* ; McGrath, C. E. ; Millard, M. J. ; Millis, J. ; Mooney, C. L. ; Moriarty, P. ; Mukherjee, R. ; O'Brien, S. ; Ong, R. A. ; Pohl, M.DESY* ; Pueschel, E.DESY* ; Quinn, J. ; Ragan, K. ; Reynolds, P. T. ; Ribeiro, D. ; Roache, E. ; Sadeh, I.DESY* ; Sadun, A. C. ; Saha, L. ; Santander, M. ; Sembroski, G. H. ; Shang, R. ; Splettstoesser, M. ; Talluri, A. K. ; Tucci, J. V. ; Vassiliev, V. V. ; Williams, D. A. ; Wong, S. L. ; Hovatta, T. ; Jorstad, S. G. ; Kiehlmann, S. ; Lähteenmäki, A. ; Liodakis, I. ; Marscher, A. P. ; Max-Moerbeck, W. ; Readhead, A. C. S. ; Reeves, R. ; Smith, P. S. ; Tornikoski, M. ; VERITAS Collaboration (Collaboration author)

2023
Institute of Physics Publ. London

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Please use a persistent id in citations: doi:10.3847/1538-4357/acd2d0  doi:10.3204/PUBDB-2023-03993

Report No.: arXiv:2305.02860

Abstract: 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.

Keyword(s): gamma ray: VHE ; gamma ray: emission ; gamma ray: flux ; emission: model ; detector: imaging ; polarization: monitoring ; VERITAS ; GeV ; optical ; correlation ; spectral ; variability ; power spectrum ; blazar ; photon ; spectral energy distribution ; GLAST ; synchrotron

Note: 18 pages, 6 figures. Accepted for publication in the Astrophysical Journal (ApJ)

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Contributing Institute(s):

1. Cherenkov Telescope Array (Z_CTA)
2. VERITAS (Z_VER)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)

Experiment(s):

1. Cherenkov Telescope Array
2. Very Energetic Radiation Imaging Telescope Array System

Appears in the scientific report 2023

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Acharyya, A. (Corresponding author)Extern* ; Adams, C. B. ; Archer, A. ; et al
VERITAS discovery of very high energy gamma-ray emission from S3 1227+25 and multiwavelength observations
[10.3204/PUBDB-2023-03521]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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