PoS - Proceedings of Science
Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Gamma-Ray Astronomy. GA-extra-galactic
VERITAS detection of VHE emission from the optically bright quasar OJ 287
S. O'Brien*  on behalf of the VERITAS Collaboration
Full text: pdf
Pre-published on: August 30, 2017
Published on: August 03, 2018
We report on the VERITAS detection of very-high-energy (VHE, $E > 100~\mathrm{GeV}$) $\gamma$-ray emission from the optically bright quasar OJ~287 which is located at a redshift of z = 0.306. OJ~287 has been observed to display regular optical outbursts with a period of approximately 12 years, with the last major optical outburst having occurred in 2015. To explain this periodicity, models involving a binary supermassive black hole system at the core of OJ~287, or a helical jet, have been developed. Motivated by elevated {\it Swift}-XRT count rates, VERITAS observed OJ~287 in February 2017, and detected the object at >5 standard deviations above background. This detection prompted further VERITAS, {\it Swift}-XRT and multiwavelength observations of the object. The results of the VERITAS observational campaign are presented.
DOI: https://doi.org/10.22323/1.301.0650
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