Veritas discovery of 1200 gev gamma-ray emission from the intermediate-frequency-peaked bl lacertae object w comae

V. A. Acciari, E. Aliu, M. Beilicke, W. Benbow, M. Böttcher, S. M. Bradbury, J. H. Buckley, V. Bugaev, Y. Butt, O. Celik, A. Cesarini, L. Ciupik, Y. C.K. Chow, P. Cogan, P. Colin, W. Cui, M. K. Daniel, T. Ergin, A. D. Falcone, S. J. FeganJ. P. Finley, G. Finnegan, P. Fortin, L. F. Fortson, A. Furniss, D. Gall, G. H. Gillanders, J. Grube, R. Guenette, G. Gyuk, D. Hanna, E. Hays, J. Holder, D. Horan, C. M. Hui, T. B. Humensky, A. Imran, P. Kaaret, N. Karlsson, M. Kertzman, D. B. Kieda, A. Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, K. Lee, G. Maier, A. McCann, M. McCutcheon

Research output: Contribution to journalArticle

87 Scopus citations

Abstract

We report the detection of very high energy 7-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae (z=p 0.102) by VERITAS. The source was observed between 2008 January and April. A strong outburst of 7-ray emission was measured in the middle of March, lasting for only 4 days. The energy spectrum measured during the two highest flare nights is fit by a power law and is found to be very steep, with a differential photon spectral index of ×=3.81 ± 0.35stat ± 0.34syst. The integral photon flux above 200 GeV during those two nights corresponds to roughly 9% of the flux from the Crab Nebula. Quasi-simultaneous Swift observations at X-ray energies were triggered by the VERITAS observations. The spectral energy distribution of the flare data can be described by synchrotron self-Compton (SSC) or external Compton (EC) leptonic jet models.

Original languageEnglish (US)
Pages (from-to)L73-L77
JournalAstrophysical Journal
Volume684
Issue number2 PART 2
DOIs
StatePublished - 2008

Keywords

  • BL Lacertae objects: Individual (W Comae)
  • Gamma rays: Observations

Fingerprint Dive into the research topics of 'Veritas discovery of 1200 gev gamma-ray emission from the intermediate-frequency-peaked bl lacertae object w comae'. Together they form a unique fingerprint.

Cite this