Energy spectrum of TeV gamma rays from Mrk 501 obtained by stereoscopic analysis

T Yamamoto ,Y Hayashi,N Kawasumi,T Matsuyama,H Lafoux,A Shiomi,T Yuda,F Kajino,H Yoshii,N Ito,N Chamoto,T Nishiyama,Y Uchihori,R Torii,M Sakata,M Tsukiji,M Nagano,K Honda,N Inoue,K Hibino,S Kawakami,K Mizutani,M Ohnishi,S Kabe,N Hotta,T Ouchi,M Takeda,Hisashi Kitamura ,Eiji Kusano ,E C Loh ,T Takahashi ,N Hayashida ,H Ohoka ,Y Yamamoto ,T Kashiwagi ,M Sasano ,Shigeru Yoshida ,To Saito ,Fumihiro Ishikawa ,J Nishimura ,P Sokolsky ,M Teshima ,H Hirasawa ,Scott Taylor ,Kazuki Kuramochi ,Y Kawasaki ,Hidetoshi Shimodaira ,Masaki Nakamura ,S Hayashi ,D Nishikawa ,N Sakaki ,M Chikawa

doi:10.1016/s0927-6505(99)00038-9

Energy spectrum of TeV gamma rays from Mrk 501 obtained by stereoscopic analysis

T Yamamoto , Y Hayashi + Show 50 more

https://doi.org/10.1016/s0927-6505(99)00038-9

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Journal: Astroparticle Physics	Publication Date: Jun 1, 1999
Citations: 4

Affiliation: The University of Tokyo, Osaka City University, University of Yamanashi, Kobe University, Saitama University, Konan University, Urawa University, High Energy Accelerator Research Organization, Utsunomiya University, University of Utah, Kindai University

#Stereoscopic Analysis #Energy Spectrum Of Gamma Rays + Show 8 more

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Abstract

We have observed flares of TeV-gamma rays from Mrk501 in 1997 using three telescopes of the Utah Seven Telescope Array at Dugway, Utah. Determination of the energy spectrum from such Active Galactic Nuclei (AGN) is very important, because the gamma-ray spectrum is expected to steepen around 10 TeV from objects like Mrk501 by the interaction of the infrared photons. We have developed the method to estimate energies of the gamma rays by stereoscopic analysis using multiple telescopes. The differential index of the energy spectrum obtained is well expressed by −2.5 between 700 GeV and 3 TeV. This spectrum seems to become steeper above several TeV.

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