We perform an analysis of the long- and short-term variability of the very high energy (VHE; above 100 GeV) gamma-ray emission from the newly-detected distant blazar 1ES 0647+250. Both new and archival data from the VERITAS telescope were examined, and no strong evidence for integral flux variability on any timescale was found. This lack of variability is consistent with the application of current ultra-high energy cosmic ray (UHECR) models, which can produce secondary gamma-ray emission along the line of sight from the blazar; it also allows averaging over multiyear timescales without bias, aiding in the construction of spectral energy distribution plots (SEDs) for 1ES 0647+250. Because of its distance, 1ES 0647+250 is an object of interest for further study, particularly in efforts to constrain models of the extragalactic background light (EBL) and intergalactic magnetic field strength (IGMFs).
Molter, Margaret R.; Dumm, Jon; and Fortson, Lucy
"VERITAS Very High Energy Observations of the Distant Blazar 1ES 0647+250,"
Macalester Journal of Physics and Astronomy:
1, Article 8.
Available at: http://digitalcommons.macalester.edu/mjpa/vol2/iss1/8