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VERITAS discovery of very high energy gamma-ray emission from S3 1227+25 and multiwavelength observations

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arxiv 2305.02860 v1 pith:NKAAZ6C3 submitted 2023-05-04 astro-ph.HE

Atreya Acharyya , Colin Adams , Avery Archer , Priyadarshini Bangale , Wystan Benbow , Aryeh Brill , Jodi Christiansen , Alisha Chromey
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Manel Errando Abe Falcone Qi Feng John Finley Gregory Foote Lucy Fortson Amy Furniss Greg Gallagher William Hanlon David Hanna Olivier Hervet Claire Hinrichs John Hoang Jamie Holder Weidong Jin Madalyn Johnson Philip Kaaret Mary P. Kertzman David Kieda Tobias Kleiner Nikolas Korzoun Frank Krennrich Mark Lang Matthew Lundy Gernot Maier Conor McGrath Matthew Millard John Millis Connor Mooney Patrick Moriarty Reshmi Mukherjee Stephan O'Brien Rene A. Ong Martin Pohl Elisa Pueschel John Quinn Kenneth J. Ragan Paul Reynolds Deivid Ribeiro Emmet Thomas Roache Iftach Sadeh Alberto Sadun Lab Saha Marcos Santander Glenn Sembroski Ruo Shang Megan Splettstoesser Anjana Talluri James Tucci Vladimir Vassiliev David Williams Sam Wong (VERITAS Collaboration) Talvikki Hovatta Svetlana Jorstad Sebastian Kiehlmann Anne Lahteenmaki Ioannis Liodakis Alan Marscher Walter Max-Moerbeck Anthony Readhead Rodrigo Reeves Paul S Smith Merja Tornikoski
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keywords gamma-rayveritasemissionobservationsdetectionenergyevidencemultiwavelength
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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 May 15, 2015 with the Fermi-Large Area Telescope (LAT). A combined five-hour VERITAS exposure on May 16th and May 18th resulted in a strong 13$\sigma$ detection with a differential photon spectral index, $\Gamma$ = 3.8 $\pm$ 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 $\tau_{obs}$ = 6.2 $\pm$ 0.9 hours, indicating emission from compact regions within the jet, and the combined gamma-ray spectrum shows no strong evidence of a spectral cut-off. 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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