Observation of gamma‐ray emission from the galaxy m87 above 250 gev with veritas1
- Acciari, V. A.
- Beilicke, M.
- Blaylock, G.
- Bradbury, S. M.
- Buckley, J. H.
- Bugaev, V.
- Butt, Y.
- Celik, O.
- Cesarini, A.
- Ciupik, L.
- Cogan, P.
- Colin, P.
- Cui, W.
- Daniel, M. K.
- Duke, C.
- Ergin, T.
- Falcone, A. D.
- Fegan, S. J.
- Finley, J. P.
- Finnegan, G.
- Fortin, P.
- Fortson, L. F.
- Gibbs, K.
- Gillanders, G. H.
- Grube, J.
- Guenette, R.
- Gyuk, G.
- Hanna, D.
- Hays, E.
- Holder, J.
- Horan, D.
- Hughes, S. B.
- Hui, M. C.
- Humensky, T. B.
- Imran, A.
- Kaaret, P.
- Kertzman, M.
- Kieda, D. B.
- Kildea, J.
- Konopelko, A.
- Krawczynski, H.
- Krennrich, F.
- Lang, M. J.
- LeBohec, S.
- Lee, K.
- Maier, G.
- McCann, A.
- McCutcheon, M.
- Millis, J.
- Moriarty, P.
- Mukherjee, R.
- Nagai, T.
- Ong, R. A.
- Pandel, D.
- Perkins, J. S.
- Pohl, M.
- Quinn, J.
- Ragan, K.
- Reynolds, P. T.
- Rose, H. J.
- Schroedter, M.
- Sembroski, G. H.
- Smith, A. W.
- Steele, D.
- Swordy, S. P.
- Syson, A.
- Toner, J. A.
- Valcarcel, L.
- Vassiliev, V. V.
- Wakely, S. P.
- Ward, J. E.
- Weekes, T. C.
- Weinstein, A.
- White, R. J.
- Williams, D. A.
- Wissel, S. A.
- Wood, M. D.
- Zitzer, B.
DOIAbstract
The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in active galactic nuclei from radio waves to TeV gamma-rays. Here we report the detection of gamma-ray emission above 250 GeV from M87 in spring 2007 with the VERITAS atmospheric Cerenkov telescope array and discuss its correlation with the X-ray emission. The gamma-ray emission is measured to be pointlike with an intrinsic source radius less than 4.5'. The differential energy spectrum is fitted well by a power-law function: d Phi/dE = (7.4 +/- 1.3(stat) +/- 1.5(sys))(E/TeV)((-2.31 +/- 0.17stat +/- 0.2sys)) 10(-9) m(-2) s(-1) TeV(-1). We show strong evidence for a year-scale correlation between the gamma-ray f...
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