During the period March-April 1997, a high flux level of TeV γ-rays was observed from Mkn 501, using the HEGRA stereoscopic system of four imaging atmospheric Cherenkov telescopes (IACTs). The almost background-free detection of γ-rays with a rate exceeding in average 100 h−1, coupled with good energy resolution of the instrument ⩽25% allowed a study of the flux variation on time scales between 5 min and days, and measurements of the differential energy spectrum of the source for selected periods. Here we briefly discuss the results of observations with emphasis on the measurements of temporal and spectral characteristics of the source at 3 subsequent periods in April when the average flux of the source showed a remarkable increase of the flux from about one to eight times the flux observed from the Crab Nebula.
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10 May 1997
The fourth compton symposium
27-30 Apr 1997
Williamsburg, Virginia (USA)
Research Article|
May 10 1997
Study of the temporal and spectral characteristics of TeV gamma radiation from Mkn 501 during a state of high activity by the HEGRA IACT array Available to Purchase
F. Aharonian;
F. Aharonian
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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A. Akhperjanian;
A. Akhperjanian
2Yerevan Physics Institute, 375036 Yerevan, Armenia
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J. Barrio;
J. Barrio
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
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K. Bernlöhr;
K. Bernlöhr
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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J. Beteta;
J. Beteta
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
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S. Bradbury;
S. Bradbury
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
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J. Contreras;
J. Contreras
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
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J. Cortina;
J. Cortina
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
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A. Daum;
A. Daum
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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T. Deckers;
T. Deckers
5Universität Kiel, Inst. für Kernphysik, D-42118 Kiel, Germany
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E. Feigl;
E. Feigl
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
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J. Fernandez;
J. Fernandez
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
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V. Fonseca;
V. Fonseca
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
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A. Frass;
A. Frass
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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B. Funk;
B. Funk
6BUGH Wuppertal, Fachbereich Physik, D-42119 Wuppertal, Germany
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J. Gonzalez;
J. Gonzalez
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
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V. Haustein;
V. Haustein
7Universität Hamburg, II. Inst. für Experimentalphysik, D-22761 Hamburg, Germany
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G. Heinzelmann;
G. Heinzelmann
7Universität Hamburg, II. Inst. für Experimentalphysik, D-22761 Hamburg, Germany
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M. Hemberger;
M. Hemberger
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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G. Hermann;
G. Hermann
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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M. Hess;
M. Hess
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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A. Heusler;
A. Heusler
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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W. Hofmann;
W. Hofmann
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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I. Holl;
I. Holl
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
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D. Horns;
D. Horns
7Universität Hamburg, II. Inst. für Experimentalphysik, D-22761 Hamburg, Germany
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R. Kankanian;
R. Kankanian
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
2Yerevan Physics Institute, 375036 Yerevan, Armenia
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O. Kirstein;
O. Kirstein
5Universität Kiel, Inst. für Kernphysik, D-42118 Kiel, Germany
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C. Köhler;
C. Köhler
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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A. Konopelko;
A. Konopelko
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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H. Kornmayer;
H. Kornmayer
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
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D. Kranich;
D. Kranich
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
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H. Krawczynski;
H. Krawczynski
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
7Universität Hamburg, II. Inst. für Experimentalphysik, D-22761 Hamburg, Germany
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H. Lampeitl;
H. Lampeitl
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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A. Lindner;
A. Lindner
7Universität Hamburg, II. Inst. für Experimentalphysik, D-22761 Hamburg, Germany
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E. Lorenz;
E. Lorenz
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
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N. Magnussen;
N. Magnussen
6BUGH Wuppertal, Fachbereich Physik, D-42119 Wuppertal, Germany
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H. Meyer;
H. Meyer
6BUGH Wuppertal, Fachbereich Physik, D-42119 Wuppertal, Germany
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R. Mirzoyan;
R. Mirzoyan
2Yerevan Physics Institute, 375036 Yerevan, Armenia
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
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H. Möller;
H. Möller
6BUGH Wuppertal, Fachbereich Physik, D-42119 Wuppertal, Germany
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A. Moralejo;
A. Moralejo
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
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L. Padilla;
L. Padilla
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
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M. Panter;
M. Panter
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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D. Petry;
D. Petry
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
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R. Plaga;
R. Plaga
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
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J. Prahl;
J. Prahl
7Universität Hamburg, II. Inst. für Experimentalphysik, D-22761 Hamburg, Germany
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C. Prosch;
C. Prosch
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
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G. Pühlhofer;
G. Pühlhofer
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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G. Rauterberg;
G. Rauterberg
5Universität Kiel, Inst. für Kernphysik, D-42118 Kiel, Germany
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W. Rhode;
W. Rhode
6BUGH Wuppertal, Fachbereich Physik, D-42119 Wuppertal, Germany
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R. Rivero;
R. Rivero
6BUGH Wuppertal, Fachbereich Physik, D-42119 Wuppertal, Germany
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A. Röhring;
A. Röhring
7Universität Hamburg, II. Inst. für Experimentalphysik, D-22761 Hamburg, Germany
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V. Sahakian;
V. Sahakian
2Yerevan Physics Institute, 375036 Yerevan, Armenia
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M. Samorski;
M. Samorski
5Universität Kiel, Inst. für Kernphysik, D-42118 Kiel, Germany
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J. Sanchez;
J. Sanchez
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
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D. Schmele;
D. Schmele
7Universität Hamburg, II. Inst. für Experimentalphysik, D-22761 Hamburg, Germany
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T. Schmidt;
T. Schmidt
6BUGH Wuppertal, Fachbereich Physik, D-42119 Wuppertal, Germany
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W. Stamm;
W. Stamm
5Universität Kiel, Inst. für Kernphysik, D-42118 Kiel, Germany
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M. Ulrich;
M. Ulrich
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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H. Völk;
H. Völk
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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S. Westerhoff;
S. Westerhoff
6BUGH Wuppertal, Fachbereich Physik, D-42119 Wuppertal, Germany
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B. Wiebel-Sooth;
B. Wiebel-Sooth
6BUGH Wuppertal, Fachbereich Physik, D-42119 Wuppertal, Germany
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C. A. Wiedner;
C. A. Wiedner
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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M. Willmer;
M. Willmer
5Universität Kiel, Inst. für Kernphysik, D-42118 Kiel, Germany
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H. Wirth
H. Wirth
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
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F. Aharonian
1
A. Akhperjanian
2
J. Barrio
3,4
K. Bernlöhr
1
J. Beteta
4
S. Bradbury
3
J. Contreras
4
J. Cortina
4
A. Daum
1
T. Deckers
5
E. Feigl
3
J. Fernandez
3,4
V. Fonseca
4
A. Frass
1
B. Funk
6
J. Gonzalez
4
V. Haustein
7
G. Heinzelmann
7
M. Hemberger
1
G. Hermann
1
M. Hess
1
A. Heusler
1
W. Hofmann
1
I. Holl
3
D. Horns
7
R. Kankanian
1,2
O. Kirstein
5
C. Köhler
1
A. Konopelko
1
H. Kornmayer
3
D. Kranich
3
H. Krawczynski
1,7
H. Lampeitl
1
A. Lindner
7
E. Lorenz
3
N. Magnussen
6
H. Meyer
6
R. Mirzoyan
2,3,4
H. Möller
6
A. Moralejo
4
L. Padilla
4
M. Panter
1
D. Petry
3
R. Plaga
3
J. Prahl
7
C. Prosch
3
G. Pühlhofer
1
G. Rauterberg
5
W. Rhode
6
R. Rivero
6
A. Röhring
7
V. Sahakian
2
M. Samorski
5
J. Sanchez
4
D. Schmele
7
T. Schmidt
6
W. Stamm
5
M. Ulrich
1
H. Völk
1
S. Westerhoff
6
B. Wiebel-Sooth
6
C. A. Wiedner
1
M. Willmer
5
H. Wirth
1
1Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
2Yerevan Physics Institute, 375036 Yerevan, Armenia
3Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 Munich, Germany
4Facultad de Ciencias Fisicas, Universidad Complutense, E-28040 Madrid, Spain
5Universität Kiel, Inst. für Kernphysik, D-42118 Kiel, Germany
6BUGH Wuppertal, Fachbereich Physik, D-42119 Wuppertal, Germany
7Universität Hamburg, II. Inst. für Experimentalphysik, D-22761 Hamburg, Germany
AIP Conf. Proc. 410, 1397–1401 (1997)
Citation
F. Aharonian, A. Akhperjanian, J. Barrio, K. Bernlöhr, J. Beteta, S. Bradbury, J. Contreras, J. Cortina, A. Daum, T. Deckers, E. Feigl, J. Fernandez, V. Fonseca, A. Frass, B. Funk, J. Gonzalez, V. Haustein, G. Heinzelmann, M. Hemberger, G. Hermann, M. Hess, A. Heusler, W. Hofmann, I. Holl, D. Horns, R. Kankanian, O. Kirstein, C. Köhler, A. Konopelko, H. Kornmayer, D. Kranich, H. Krawczynski, H. Lampeitl, A. Lindner, E. Lorenz, N. Magnussen, H. Meyer, R. Mirzoyan, H. Möller, A. Moralejo, L. Padilla, M. Panter, D. Petry, R. Plaga, J. Prahl, C. Prosch, G. Pühlhofer, G. Rauterberg, W. Rhode, R. Rivero, A. Röhring, V. Sahakian, M. Samorski, J. Sanchez, D. Schmele, T. Schmidt, W. Stamm, M. Ulrich, H. Völk, S. Westerhoff, B. Wiebel-Sooth, C. A. Wiedner, M. Willmer, H. Wirth; Study of the temporal and spectral characteristics of TeV gamma radiation from Mkn 501 during a state of high activity by the HEGRA IACT array. AIP Conf. Proc. 10 May 1997; 410 (1): 1397–1401. https://doi.org/10.1063/1.53951
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