The Astrophysical Journal
First and Last Page
High-energy gamma radiation has been observed from the optically violent variable (OVV) quasar 3C 454.3 (PKS 2251+158) by the Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Observatory. During the 1992 January-February observation, the emission showed a power-law photon spectrum with an exponent of -2.18 +/- 0.08. The flux density (E> 100 MeV) was observed to vary within the range (0.4-1.4) x 106 photon cm-2 s-1 on a time scale of less than a week. Lower sensitivity observations during 1992 April and May also detected emission within that range, but with lower statistical significance. An earlier low-sensitivity exposure during 1991 August gave a 95% confidence upper limit of 0.26 x 106 photon cm-2 s-1. The similarity of the gamma-ray emission of 3C 454.3 to that of 3C 279 parallels the similarity of these two objects at lower frequencies.
Hartman, R. C., Bertsch, D. L., Dingus, B. L., Fichtel, C. E., Hunter, S. D., Kanbach, G., Kniffen, D. A., Lin, Y. C., Mattox, J. R., Mayer-Hasselwander, H. A., Michelson, P. F., von Montigny, C., Nolan, P. L., Piner, B. G., Schneid, E., Sreekumar, P., & Thompson, D. J. (1993). EGRET Detection of High-Energy Gamma Radiation from the OVV Quasar 3C 454.3. The Astrophysical Journal, 407, L41. Retrieved from https://poetcommons.whittier.edu/phys/59