期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 781, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/781/1/L11
关键词
gamma rays: general; ISM: individual objects (Crab Nebula)
资金
- U.S. Department of Energy Office of Science
- U.S. National Science Foundation
- Smithsonian Institution
- NSERC in Canada
- STFC in the U.K.
- Direct For Mathematical & Physical Scien
- Division Of Physics [0969043, 0969529, 1207595, 1206534, 1125897, 1307311, 1307443] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1068179, 1402740] Funding Source: National Science Foundation
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 >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 >1 TeV and the flux change seen in the Fermi-LAT band >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.
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