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VERITAS observations of the BL Lac object TXS 0506+056

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arxiv 1807.04607 v1 pith:PYWOFMP5 submitted 2018-07-12 astro-ph.HE

VERITAS observations of the BL Lac object TXS 0506+056

A. U. Abeysekara , A. Archer , W. Benbow , R. Bird , A. Brill , R. Brose , J. H. Buckley , J. L. Christiansen
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A. J. Chromey M. K. Daniel A. Falcone Q. Feng J. P. Finley L. Fortson A. Furniss G. H. Gillanders O. Gueta D. Hanna O. Hervet J. Holder G. Hughes T. B. Humensky C. A. Johnson P. Kaaret P. Kar N. Kelley-Hoskins M. Kertzman D. Kieda M. Krause F. Krennrich M. J. Lang P. Moriarty R. Mukherjee S. O'Brien R. A. Ong A. N. Otte N. Park A. Petrashyk M. Pohl E. Pueschel J. Quinn K. Ragan P. T. Reynolds G. T. Richards E. Roache C. Rulten I. Sadeh M. Santander S. S. Scott G. H. Sembroski K. Shahinyan J. Tyler S. P. Wakely A. Weinstein R. M. Wells P. Wilcox A. Wilhelm D. A. Williams T. J Williamson B. Zitzer
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classification astro-ph.HE
keywords neutrinoveritasblazaralertemissionfluxgamma-rayicecube
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On 2017 September 22, the IceCube Neutrino Observatory reported the detection of the high-energy neutrino event \icnu, of potential astrophysical origin. It was soon determined that the neutrino direction was consistent with the location of the gamma-ray blazar \txs~(3FGL J0509.4+0541), which was in an elevated gamma-ray emission state as measured by the \emph{Fermi} satellite. VERITAS observations of the neutrino/blazar region started on 2017 September 23 in response to the neutrino alert and continued through 2018 February 6. While no significant very-high-energy (VHE; E $>$ 100 GeV) emission was observed from the blazar by VERITAS in the two-week period immediately following the IceCube alert, TXS 0506+056 was detected by VERITAS with a significance of 5.8 standard deviations ($\sigma$) in the full 35-hour data set. The average photon flux of the source during this period was $(8.9 \pm 1.6) \times 10^{-12} \; \mathrm{cm}^{-2} \, \mathrm{s}^{-1}$, or 1.6\% of the Crab Nebula flux, above an energy threshold of 110 GeV, with a soft spectral index of $4.8 \pm 1.3$.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. A Unified Explanation of Gamma-Ray and Neutrino Spectra from Astrophysical Sources Based on the Gluon Condensation Model

    astro-ph.HE 2026-04 unverdicted novelty 5.0

    The Gluon Condensation model fits gamma-ray spectra of TXS 0506+056 and NGC 1068 with neutrino predictions consistent with IceCube, but predicts spectral hardening that disfavors it for SNR G54.1+0.3.

  2. A Unified Explanation of Gamma-Ray and Neutrino Spectra from Astrophysical Sources Based on the Gluon Condensation Model

    astro-ph.HE 2026-04 unverdicted novelty 5.0

    The Gluon Condensation model fits gamma-ray spectra of TXS 0506+056 and NGC 1068 with neutrino predictions consistent with IceCube, but predicts unphysical hardening for SNR G54.1+0.3.