Observations of Mkn 421 during 1997 and 1998 in the energy range above 500 GeV with the HEGRA stereoscopic Cherenkov telescope system

F. A. Aharonian; A. G. Akhperjanian; M. Andronache; J. A. Barrio; K. Bernlöhr; H. Bojahr; I. Calle; J. L. Contreras; J. Cortina; A. Daum; T. Deckers; S. Denninghoff; V. Fonseca; J. C. Gonzalez; N. Götting; G. Heinzelmann; M. Hemberger; G. Hermann; M. Heß; A. Heusler; W. Hofmann; H. Hohl; D. Horns; A. Ibarra; R. Kankanyan; J. Kettler; C. Köhler; A. Konopelko; H. Kornmeyer; M. Kestel; D. Kranich; H. Krawczynski; H. Lampeitl; A. Lindner; E. Lorenz; N. Magnussen; O. Mang; H. Meyer; R. Mirzoyan; A. Moralejo; L. Padilla; M. Panter; D. Petry; R. Plaga; A. Plyasheshnikov; J. Prahl; G. Pühlhofer; G. Rauterberg; C. Renault; W. Rhode; A. Röhring; V. Sahakian; M. Samorski; M. Schilling; F. Schröder; W. Stamm; H. J. Völk; B. Wiebel-Sooth; C. Wiedner; M. Willmer; W. Wittek

Observations of Mkn 421 during 1997 and 1998 in the energy range above 500 GeV with the HEGRA stereoscopic Cherenkov telescope system

F. A. Aharonian, A. G. Akhperjanian, M. Andronache, J. A. Barrio, K. Bernlöhr, H. Bojahr, I. Calle, J. L. Contreras, J. Cortina, A. Daum, T. Deckers, S. Denninghoff, V. Fonseca, J. C. Gonzalez, N. Götting, G. Heinzelmann, M. Hemberger, G. Hermann, M. Heß, A. HeuslerW. Hofmann, H. Hohl, D. Horns, A. Ibarra, R. Kankanyan, J. Kettler, C. Köhler, A. Konopelko, H. Kornmeyer, M. Kestel, D. Kranich, H. Krawczynski, H. Lampeitl, A. Lindner, E. Lorenz, N. Magnussen, O. Mang, H. Meyer, R. Mirzoyan, A. Moralejo, L. Padilla, M. Panter, D. Petry, R. Plaga, A. Plyasheshnikov, J. Prahl, G. Pühlhofer, G. Rauterberg, C. Renault, W. Rhode, A. Röhring, V. Sahakian, M. Samorski, M. Schilling, F. Schröder, W. Stamm, H. J. Völk, B. Wiebel-Sooth, C. Wiedner, M. Willmer, W. Wittek

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Abstract

Since its commissioning in fall 1996, the stereoscopic system of Imaging Atmospheric Cherenkov Telescopes (IACTs) of HEGRA, with an energy flux sensitivity νF_ν at 1 TeV of 10^-11 erg cm^-2 s^-1 for one hour of observation time, has been used to monitor the BL Lac object Mkn 421 on a regular basis. In this paper, we report detailed temporal and spectral information about the TeV characteristics of Mkn 421 in 1997 and 1998. We study the light curve, the shortest time scales of flux variability, the differential spectra on a diurnal basis for several days with good γ-ray statistics, and the time-averaged energy spectrum. Special emphasis is put on presenting the data taken during the world-wide April 1997 multiwavelength campaign.

Original language	English
Pages (from-to)	757-764
Number of pages	8
Journal	Astronomy and Astrophysics
Volume	350
Issue number	3
State	Published - 1999

Keywords

Galaxies: BL Lacertae objects: Individual: Mkn 421
Gamma rays: observations

Cite this

Aharonian, F. A., Akhperjanian, A. G., Andronache, M., Barrio, J. A., Bernlöhr, K., Bojahr, H., Calle, I., Contreras, J. L., Cortina, J., Daum, A., Deckers, T., Denninghoff, S., Fonseca, V., Gonzalez, J. C., Götting, N., Heinzelmann, G., Hemberger, M., Hermann, G., Heß, M., ... Wittek, W. (1999). Observations of Mkn 421 during 1997 and 1998 in the energy range above 500 GeV with the HEGRA stereoscopic Cherenkov telescope system. Astronomy and Astrophysics, 350(3), 757-764.

@article{236a297df4b3421088bfdc6dae47454c,

title = "Observations of Mkn 421 during 1997 and 1998 in the energy range above 500 GeV with the HEGRA stereoscopic Cherenkov telescope system",

abstract = "Since its commissioning in fall 1996, the stereoscopic system of Imaging Atmospheric Cherenkov Telescopes (IACTs) of HEGRA, with an energy flux sensitivity νFν at 1 TeV of 10-11 erg cm-2 s-1 for one hour of observation time, has been used to monitor the BL Lac object Mkn 421 on a regular basis. In this paper, we report detailed temporal and spectral information about the TeV characteristics of Mkn 421 in 1997 and 1998. We study the light curve, the shortest time scales of flux variability, the differential spectra on a diurnal basis for several days with good γ-ray statistics, and the time-averaged energy spectrum. Special emphasis is put on presenting the data taken during the world-wide April 1997 multiwavelength campaign.",

keywords = "Galaxies: BL Lacertae objects: Individual: Mkn 421, Gamma rays: observations",

author = "Aharonian, {F. A.} and Akhperjanian, {A. G.} and M. Andronache and Barrio, {J. A.} and K. Bernl{\"o}hr and H. Bojahr and I. Calle and Contreras, {J. L.} and J. Cortina and A. Daum and T. Deckers and S. Denninghoff and V. Fonseca and Gonzalez, {J. C.} and N. G{\"o}tting and G. Heinzelmann and M. Hemberger and G. Hermann and M. He{\ss} and A. Heusler and W. Hofmann and H. Hohl and D. Horns and A. Ibarra and R. Kankanyan and J. Kettler and C. K{\"o}hler and A. Konopelko and H. Kornmeyer and M. Kestel and D. Kranich and H. Krawczynski and H. Lampeitl and A. Lindner and E. Lorenz and N. Magnussen and O. Mang and H. Meyer and R. Mirzoyan and A. Moralejo and L. Padilla and M. Panter and D. Petry and R. Plaga and A. Plyasheshnikov and J. Prahl and G. P{\"u}hlhofer and G. Rauterberg and C. Renault and W. Rhode and A. R{\"o}hring and V. Sahakian and M. Samorski and M. Schilling and F. Schr{\"o}der and W. Stamm and V{\"o}lk, {H. J.} and B. Wiebel-Sooth and C. Wiedner and M. Willmer and W. Wittek",

year = "1999",

language = "English",

volume = "350",

pages = "757--764",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

number = "3",

}

Aharonian, FA, Akhperjanian, AG, Andronache, M, Barrio, JA, Bernlöhr, K, Bojahr, H, Calle, I, Contreras, JL, Cortina, J, Daum, A, Deckers, T, Denninghoff, S, Fonseca, V, Gonzalez, JC, Götting, N, Heinzelmann, G, Hemberger, M, Hermann, G, Heß, M, Heusler, A, Hofmann, W, Hohl, H, Horns, D, Ibarra, A, Kankanyan, R, Kettler, J, Köhler, C, Konopelko, A, Kornmeyer, H, Kestel, M, Kranich, D, Krawczynski, H, Lampeitl, H, Lindner, A, Lorenz, E, Magnussen, N, Mang, O, Meyer, H, Mirzoyan, R, Moralejo, A, Padilla, L, Panter, M, Petry, D, Plaga, R, Plyasheshnikov, A, Prahl, J, Pühlhofer, G, Rauterberg, G, Renault, C, Rhode, W, Röhring, A, Sahakian, V, Samorski, M, Schilling, M, Schröder, F, Stamm, W, Völk, HJ, Wiebel-Sooth, B, Wiedner, C, Willmer, M & Wittek, W 1999, 'Observations of Mkn 421 during 1997 and 1998 in the energy range above 500 GeV with the HEGRA stereoscopic Cherenkov telescope system', Astronomy and Astrophysics, vol. 350, no. 3, pp. 757-764.

TY - JOUR

T1 - Observations of Mkn 421 during 1997 and 1998 in the energy range above 500 GeV with the HEGRA stereoscopic Cherenkov telescope system

AU - Aharonian, F. A.

AU - Akhperjanian, A. G.

AU - Andronache, M.

AU - Barrio, J. A.

AU - Bernlöhr, K.

AU - Bojahr, H.

AU - Calle, I.

AU - Contreras, J. L.

AU - Cortina, J.

AU - Daum, A.

AU - Deckers, T.

AU - Denninghoff, S.

AU - Fonseca, V.

AU - Gonzalez, J. C.

AU - Götting, N.

AU - Heinzelmann, G.

AU - Hemberger, M.

AU - Hermann, G.

AU - Heß, M.

AU - Heusler, A.

AU - Hofmann, W.

AU - Hohl, H.

AU - Horns, D.

AU - Ibarra, A.

AU - Kankanyan, R.

AU - Kettler, J.

AU - Köhler, C.

AU - Konopelko, A.

AU - Kornmeyer, H.

AU - Kestel, M.

AU - Kranich, D.

AU - Krawczynski, H.

AU - Lampeitl, H.

AU - Lindner, A.

AU - Lorenz, E.

AU - Magnussen, N.

AU - Mang, O.

AU - Meyer, H.

AU - Mirzoyan, R.

AU - Moralejo, A.

AU - Padilla, L.

AU - Panter, M.

AU - Petry, D.

AU - Plaga, R.

AU - Plyasheshnikov, A.

AU - Prahl, J.

AU - Pühlhofer, G.

AU - Rauterberg, G.

AU - Renault, C.

AU - Rhode, W.

AU - Röhring, A.

AU - Sahakian, V.

AU - Samorski, M.

AU - Schilling, M.

AU - Schröder, F.

AU - Stamm, W.

AU - Völk, H. J.

AU - Wiebel-Sooth, B.

AU - Wiedner, C.

AU - Willmer, M.

AU - Wittek, W.

PY - 1999

Y1 - 1999

N2 - Since its commissioning in fall 1996, the stereoscopic system of Imaging Atmospheric Cherenkov Telescopes (IACTs) of HEGRA, with an energy flux sensitivity νFν at 1 TeV of 10-11 erg cm-2 s-1 for one hour of observation time, has been used to monitor the BL Lac object Mkn 421 on a regular basis. In this paper, we report detailed temporal and spectral information about the TeV characteristics of Mkn 421 in 1997 and 1998. We study the light curve, the shortest time scales of flux variability, the differential spectra on a diurnal basis for several days with good γ-ray statistics, and the time-averaged energy spectrum. Special emphasis is put on presenting the data taken during the world-wide April 1997 multiwavelength campaign.

AB - Since its commissioning in fall 1996, the stereoscopic system of Imaging Atmospheric Cherenkov Telescopes (IACTs) of HEGRA, with an energy flux sensitivity νFν at 1 TeV of 10-11 erg cm-2 s-1 for one hour of observation time, has been used to monitor the BL Lac object Mkn 421 on a regular basis. In this paper, we report detailed temporal and spectral information about the TeV characteristics of Mkn 421 in 1997 and 1998. We study the light curve, the shortest time scales of flux variability, the differential spectra on a diurnal basis for several days with good γ-ray statistics, and the time-averaged energy spectrum. Special emphasis is put on presenting the data taken during the world-wide April 1997 multiwavelength campaign.

KW - Galaxies: BL Lacertae objects: Individual: Mkn 421

KW - Gamma rays: observations

UR - http://www.scopus.com/inward/record.url?scp=0000546344&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0000546344

SN - 0004-6361

VL - 350

SP - 757

EP - 764

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 3

ER -

Observations of Mkn 421 during 1997 and 1998 in the energy range above 500 GeV with the HEGRA stereoscopic Cherenkov telescope system

Abstract

Keywords

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