Peer-Reviewed Journal Details
Mandatory Fields
Acciari, VA,Beilicke, M,Blaylock, G,Bradbury, SM,Buckley, JH,Bugaev, V,Butt, Y,Celik, O,Cesarini, A,Ciupik, L,Cogan, P,Colin, P,Cui, W,Daniel, MK,Duke, C,Ergin, T,Falcone, AD,Fegan, SJ,Finley, JP,Finnegan, G,Fortin, P,Fortson, LF,Gibbs, K,Gillanders, GH,Grube, J,Guenette, R,Gyuk, G,Hanna, D,Hays, E,Holder, J,Horan, D,Hughes, SB,Hui, MC,Humensky, TB,Imran, A,Kaaret, P,Kertzman, M,Kieda, DB,Kildea, J,Konopelko, A,Krawczynski, H,Krennrich, F,Lang, MJ,LeBohec, S,Lee, K,Maier, G,McCann, A,McCutcheon, M,Millis, J,Moriarty, P,Mukherjee, R,Nagai, T,Ong, RA,Pandel, D,Perkins, JS,Pohl, M,Quinn, J,Ragan, K,Reynolds, PT,Rose, HJ,Schroedter, M,Sembroski, GH,Smith, AW,Steele, D,Swordy, SP,Syson, A,Toner, JA,Valcarcel, L,Vassiliev, VV,Wakely, SP,Ward, JE,Weekes, TC,Weinstein, A,White, RJ,Williams, DA,Wi
2008
May
Astrophysical Journal
Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS
Published
()
Optional Fields
galaxies : individual (M87, NGC 4486, Virgo A) gamma rays : observations SUPERMASSIVE BLACK-HOLE X-RAY TELESCOPE OBSERVATIONS UNIFIED SCHEMES TEV EMISSION LAC OBJECTS CRAB-NEBULA JET MARKARIAN-421 VARIABILITY
679
397
403
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 flux reported by TeV experiments and the X-ray emission measured by the ASM RXTE observatory, and discuss the possible short-timescale variability. These results imply that the gamma-ray emission from M87 is more likely associated with the core of the galaxy than with other bright X-ray features in the jet.
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