A SEARCH FOR ENHANCED VERY HIGH ENERGY GAMMA-RAY EMISSION FROM THE 2013 MARCH CRAB NEBULA FLARE

作者：Aliu E^*; Archambault S; Aune T; Benbow W; Berger K; Bird R; Bouvier A; Buckley J H; Bugaev V; Byrum K; Cerruti M; Chen X; Ciupik L; Connolly M P; Cui W; Dumm J; 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; Hanna D; Holder J; Hughes G; Humensky T B; Kaaret P; Kertzman M; Khassen Y; Kieda D; Krennrich F

来源：Astrophysical Journal Letters, 2014, 781(1): L11.

DOI：10.1088/2041-8205/781/1/L11

• gamma rays: general
• ISM: individual objects (Crab Nebula)

In 2013 March, a flaring episode from the Crab Nebula lasting similar to 2 weeks was detected by Fermi-LAT (Large Area Telescope on board the Fermi Gamma-ray Space Telescope). The Very Energetic Radiation Imaging Telescope Array System (VERITAS) provides simultaneous observations throughout this period. During the flare, Fermi-LAT detected a 20 fold increase in flux above the average synchrotron flux %26gt;100 MeV seen from the Crab Nebula. Simultaneous measurements with VERITAS are consistent with the non-variable long-term average Crab Nebula flux at TeV energies. Assuming a linear correlation between the very high energy flux change %26gt;1 TeV and the flux change seen in the Fermi-LAT band %26gt;100 MeV during the period of simultaneous observations, the linear correlation factor can be constrained to be at most 8.6 x 10(-3) with 95% confidence.

• 出版日期2014-1-20