Search for a TeV gamma-ray halo of Mkn 501

被引:19
作者
Aharonian, FA
Akhperjanian, AG
Barrio, JA
Bernlöhr, K
Bolz, O
Börst, H
Bojahr, H
Contreras, JL
Cortina, J
Denninghoff, S
Fonseca, V
Gonzalez, JC
Götting, N
Heinzelmann, G
Hermann, G
Heusler, A
Hofmann, W
Horns, D
Ibarra, A
Iserlohe, C
Jung, I
Kankanyan, R
Kestel, M
Kettler, J
Kohnle, A
Konopelko, A
Kornmeyer, H
Kranich, D
Krawczynski, H
Lampeitl, H
Lorenz, E
Lucarelli, F
Magnussen, N
Mang, O
Meyer, H
Mirzoyan, R
Moralejo, A
Padilla, L
Panter, M
Plaga, R
Plyasheshnikov, A
Prahl, J
Pühlhofer, G
Rhode, W
Röhring, A
Rowell, GP
Sahakian, V
Samorski, M
Schilling, M
Schröder, F
机构
[1] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany
[2] Max Planck Inst Phys, D-80805 Munich, Germany
[3] Univ Complutense, Fac Ciencias Fis, E-28040 Madrid, Spain
[4] Univ Hamburg, Inst Expt Phys 2, D-22761 Hamburg, Germany
[5] Univ Kiel, Inst Expt & Angew Phys, D-24118 Kiel, Germany
[6] Univ Wuppertal, Fachbereich Phys, D-42097 Wuppertal, Germany
[7] Yerevan Phys Inst, Yerevan 375036, Armenia
关键词
galaxies : BL Lacertae objects : individual : Mkn 501; gamma rays : observations;
D O I
10.1051/0004-6361:20000481
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
For distant extragalactic sources of gamma-rays in the PeV (10(15) eV) energy range, interactions of the gamma rays with intergalactic diffuse radiation fields will initiate a pair cascade. Depending on the magnetic fields in the vicinity of the source, the cascade can either result in an isotropic halo around an initially beamed source or remain more or less collimated. Data recorded by the HEGRA system of imaging atmospheric Cherenkov telescopes are used to derive limits on the halo flux from the AGN Mrk 501. This is achieved by comparing the angular distribution of TeV gamma-rays during the 1997 burst phase - where direct photons should dominate with the distribution during the 1998/99 quiescent state, where a steady-state halo contribution should be most pronounced. The results depend on the assumptions concerning the angular distribution of the halo; limits on the halo flux within 0.5 degrees to 1 degrees from the source range between 0.1% and 1% of the peak burst flux.
引用
收藏
页码:746 / 751
页数:6
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