Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS

Acciari, V.; Beilicke, M.; Blaylock, G.; Bradbury, S.; Buckley, J.; Bugaev, V.; Butt, Y.; Celik, O.; Cesarini, A.; Ciupik, L.; Cogan, P.; Colin, P.; Cui, W.; Daniel, M.; Duke, C.; Ergin, TÜLÜN; Falcone, A.; Fegan, S.; Finley, J.; Finnegan, G.; Fortin, P.; Fortson, L.; Gibbs, K.; Gillanders, G.; Grube, J.; Guenette, R.; Gyuk, G.; Hanna, D.; Hays, E.; Holder, J.; Horan, D.; Hughes, S.; Hui, M.; Humensky, T.; Imran, A.; Kaaret, P.; Kertzman, M.; Kieda, D.; Kildea, J.; Konopelko, A.; Krawczynski, H.; Krennrich, F.; Lang, M.; LeBohec, S.; Lee, K.; Maier, G.; McCann, A.; McCutcheon, M.; Millis, J.; Moriarty, P.; Mukherjee, R.; Nagai, T.; Ong, R.; Pandel, D.; Perkins, J.; Pohl, M.; Quinn, J.; Ragan, K.; Reynolds, P.; Rose, H.; Schroedter, M.; Sembroski, G.; Smith, A.; Steele, D.; Swordy, S.; Syson, A.; Toner, J.; Valcarcel, L.; Vassiliev, V.; Wakely, S.; Ward, J.; Weekes, T.; Weinstein, A.; White, R.; Williams, D.; Wissel, S.; Wood, M.; Zitzer, B.

doi:10.1086/587458

Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS

Atıf İçin Kopyala

Acciari V. A., Beilicke M., Blaylock G., Bradbury S. M., Buckley J. H., Bugaev V., ...Daha Fazla

ASTROPHYSICAL JOURNAL, cilt.679, sa.1, ss.397-403, 2008 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 679 Sayı: 1
Basım Tarihi: 2008
Doi Numarası: 10.1086/587458
Dergi Adı: ASTROPHYSICAL JOURNAL
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Sayfa Sayıları: ss.397-403
Anahtar Kelimeler: 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
Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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.