Veritas observations of the bl lac object pg 1553+113
- Aliu, E.
- Archer, A.
- Aune, T.
- Barnacka, A.
- Behera, B.
- Beilicke, M.
- Benbow, W.
- Berger, K.
- Bird, R.
- Buckley, J. H.
- Bugaev, V.
- Byrum, K.
- Cardenzana, J. V
- Cerruti, M.
- Chen, X.
- Ciupik, L.
- Connolly, M. P.
- Cui, W.
- Dickinson, H. J.
- Dumm, J.
- Eisch, J. D.
- Errando, M.
- Falcone, A.
- Federici, S.
- Feng, Q.
- Finley, J. P.
- Fortin, P.
- Fortson, L.
- Furniss, A.
- Galante, N.
- Gillanders, G. H.
- Griffin, S.
- Griffiths, S. T.
- Grube, J.
- Gyuk, G.
- Håkansson, N.
- Hanna, D.
- Holder, J.
- Hughes, G.
- Humensky, T. B.
- Johnson, C. A.
- Kaaret, P.
- Kar, P.
- Kertzman, M.
- Khassen, Y.
- Kieda, D.
- Krawczynski, H.
- Krennrich, F.
- Kumar, S.
- Lang, M. J.
- Madhavan, A.
- McArthur, S.
- McCann, A.
- Meagher, K.
- Millis, J.
- Moriarty, P.
- Nieto, D.
- O'Faoláin de Bhróithe, A.
- Ong, R. A.
- Orr, M.
- Otte, A. N.
- Park, N.
- Perkins, J. S.
- Pohl, M.
- Popkow, A.
- Prokoph, H.
- Pueschel, E.
- Quinn, J.
- Ragan, K.
- Rajotte, J.
- Reyes, L. C.
- Reynolds, P. T.
- Richards, G. T.
- Roache, E.
- Sembroski, G. H.
- Shahinyan, K.
- Staszak, D.
- Telezhinsky, I.
- Tucci, J. V.
- Tyler, J.
- Varlotta, A.
- Vassiliev, V. V.
- Wakely, S. P.
- Weinstein, A.
- Welsing, R.
- Wilhelm, A.
- Williams, D. A.
- Zitzer, B.
DOIAbstract
We present results from VERITAS observations of the BL Lac object PG 1553+113 spanning the years 2010, 2011, and 2012. The time-averaged spectrum, measured between 160 and 560 GeV, is well described by a power law with a spectral index of 4.33 +/- 0.09. The time-averaged integral flux above 200 GeV measured for this period was (1.69 +/- 0.06) x 10(-11) photons cm(-2) s(-1), corresponding to 6.9% of the Crab Nebula flux. We also present the combined gamma-ray spectrum from the Fermi Large Area Telescope and VERITAS covering an energy range from 100 MeV to 560 GeV. The data are well fit by a power law with an exponential cutoff at 101.9 +/- 3.2 GeV. The origin of the cutoff could be intrinsic to PG 1553+113 or be due to the gamma-ray opacity ...
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