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Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - GRI - Gamma Ray Indirect
Variability Study of Extreme Blazars with VERITAS
O. Gueta
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Pre-published on: 2019 July 22
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The VERITAS array of imaging atmospheric Cherenkov telescopes has collected nearly 6000 hours of observations of active galactic nuclei (AGNs). It has detected 39 very-high-energy (VHE, >100 GeV) AGNs at redshifts up to z = 0.9, of which 24 are classified as high-frequency-peaked BL Lacertae objects (HBLs). VERITAS has obtained an extensive dataset of HBL, including extreme HBL (xHBL), observations, with lightcurves spanning up to 11 years, allowing the char- acterization of their long-term and short-term variability. A study of various xHBLs/HBLs in the VERITAS dataset is presented, and the correlation with other energy bands tested. In particular, the short-term variability of xHBLs as a function of energy within the VHE band is examined, exploring the possibility that secondary gamma rays are produced in cosmic-ray interactions with background photons.
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