Measurement of the ux , spectrum , and variability of TeV-rays from Mkn 501 during a state of high activityF

A. G. Akhperjanian, Alf Daum, Tom Deckers,E. Feigl, Jp Fernandez,Victòria Fonseca, G. Heinzelmann,Mike Hemberger,Alexander Konopelko, J. Prahl, C. Prosch, Valerie Sahakian, M. Samorski,Jose Albeiro Sánchez,D. Schmele, T. Schmidt,W. Stamm, S. Westerho,B. Wiebel-Sooth, Christoph Wiedner, Michael Willmer,H. Wirth

semanticscholar（2007）

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摘要

a high ux level of TeV-rays was observed from Mkn 501, using the HEGRA stereoscopic system of four imaging Cherenkov telescopes. The ux level varied during this period from about one up to eight times the ux observed from the Crab Nebula. Changes of the detection rate by a factor of up to 4 within 1 day have been observed. The measured diierential energy spectrum of the radiation follows a power law from 1 TeV to 10 TeV. The diierential spectral index of 2.49 0:11 0:25 is close to that of the Crab Nebula of 2:71 0:17 0:25.

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