Measurement of the flux, spectrum, and variability of TeV γ-rays from Mkn 501 during a state of high activity

F. Aharonian; A. G. Akhperjanian; J. A. Barrio; K. Bernlöhr; J. J.G. Beteta; S. M. Bradbury; J. L. Contreras; J. Cortina; A. Daum; T. Deckers; E. Feigl; J. Fernandez; V. Fonseca; A. Fraß; B. Funk; J. C. 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. A. Sanchez; D. Schmele; T. Schmidt; W. Stamm; M. Ulrich; H. J. Völk; S. Westerhoff; B. Wiebel-Sooth; C. A. Wiedner; M. Willmer; H. Wirth

Measurement of the flux, spectrum, and variability of TeV γ-rays from Mkn 501 during a state of high activity

F. Aharonian
, A. G. Akhperjanian
, J. A. Barrio
, K. Bernlöhr
, J. J.G. Beteta
, S. M. Bradbury
, J. L. Contreras
, J. Cortina
, A. Daum
, T. Deckers
, E. Feigl
, J. Fernandez
, V. Fonseca
, A. Fraß
, B. Funk
, J. C. 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. A. Sanchez, D. Schmele, T. Schmidt, W. Stamm, M. Ulrich, H. J. Völk, S. Westerhoff, B. Wiebel-Sooth, C. A. Wiedner, M. Willmer, H. Wirth

Research output: Contribution to journal › Article › peer-review

81 Scopus citations

Abstract

Between March 16, 1997 and April 14, 1997, a high flux level of TeV γ-rays was observed from Mkn 501, using the HEGRA stereoscopic system of four imaging Cherenkov telescopes. The flux level varied during this period from about one half up to six times the flux 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 differential energy spectrum of the radiation follows a power law from 1 TeV to 10 TeV. The differential spectral index of 2.47 ±0.07 ± 0.25 is close to that of the Crab Nebula of 2.66 ± 0.12 ± 0.25.

Original language	English
Pages (from-to)	L5-L8
Journal	Astronomy and Astrophysics
Volume	327
Issue number	2
State	Published - Nov 10 1997

Keywords

BL Lacertae objects: individual: Mkn 501
Gamma rays: observations

Cite this

Aharonian, F., Akhperjanian, A. G., Barrio, J. A., Bernlöhr, K., Beteta, J. J. G., Bradbury, S. M., Contreras, J. L., Cortina, J., Daum, A., Deckers, T., Feigl, E., Fernandez, J., Fonseca, V., Fraß, A., Funk, B., Gonzalez, J. C., Haustein, V., Heinzelmann, G., Hemberger, M., ... Wirth, H. (1997). Measurement of the flux, spectrum, and variability of TeV γ-rays from Mkn 501 during a state of high activity. Astronomy and Astrophysics, 327(2), L5-L8.

@article{ef6e609e521641cea5ab670ce82e03bd,

title = "Measurement of the flux, spectrum, and variability of TeV γ-rays from Mkn 501 during a state of high activity",

abstract = "Between March 16, 1997 and April 14, 1997, a high flux level of TeV γ-rays was observed from Mkn 501, using the HEGRA stereoscopic system of four imaging Cherenkov telescopes. The flux level varied during this period from about one half up to six times the flux 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 differential energy spectrum of the radiation follows a power law from 1 TeV to 10 TeV. The differential spectral index of 2.47 ±0.07 ± 0.25 is close to that of the Crab Nebula of 2.66 ± 0.12 ± 0.25.",

keywords = "BL Lacertae objects: individual: Mkn 501, Gamma rays: observations",

author = "F. Aharonian and Akhperjanian, \{A. G.\} and Barrio, \{J. A.\} and K. Bernl{\"o}hr and Beteta, \{J. J.G.\} and Bradbury, \{S. M.\} and Contreras, \{J. L.\} and J. Cortina and A. Daum and T. Deckers and E. Feigl and J. Fernandez and V. Fonseca and A. Fra{\ss} and B. Funk and Gonzalez, \{J. C.\} and V. Haustein and G. Heinzelmann and M. Hemberger and G. Hermann and M. He{\ss} and A. Heusler and W. Hofmann and I. Holl and D. Horns and R. Kankanian and O. Kirstein and C. K{\"o}hler and A. Konopelko and H. Kornmayer and D. Kranich and H. Krawczynski and H. Lampeitl and A. Lindner and E. Lorenz and N. Magnussen and H. Meyer and R. Mirzoyan and H. M{\"o}ller and A. Moralejo and L. Padilla and M. Panter and D. Petry and R. Plaga and J. Prahl and C. Prosch and G. P{\"u}hlhofer and G. Rauterberg and W. Rhode and R. Rivero and A. R{\"o}hring and V. Sahakian and M. Samorski and Sanchez, \{J. A.\} and D. Schmele and T. Schmidt and W. Stamm and M. Ulrich and V{\"o}lk, \{H. J.\} and S. Westerhoff and B. Wiebel-Sooth and Wiedner, \{C. A.\} and M. Willmer and H. Wirth",

year = "1997",

month = nov,

day = "10",

language = "English",

volume = "327",

pages = "L5--L8",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

number = "2",

}

Aharonian, F, Akhperjanian, AG, Barrio, JA, Bernlöhr, K, Beteta, JJG, Bradbury, SM, Contreras, JL, Cortina, J, Daum, A, Deckers, T, Feigl, E, Fernandez, J, Fonseca, V, Fraß, A, Funk, B, Gonzalez, JC, Haustein, V, Heinzelmann, G, Hemberger, M, Hermann, G, Heß, M, Heusler, A, Hofmann, W, Holl, I, Horns, D, Kankanian, R, Kirstein, O, Köhler, C, Konopelko, A, Kornmayer, H, Kranich, D, Krawczynski, H, Lampeitl, H, Lindner, A, Lorenz, E, Magnussen, N, Meyer, H, Mirzoyan, R, Möller, H, Moralejo, A, Padilla, L, Panter, M, Petry, D, Plaga, R, Prahl, J, Prosch, C, Pühlhofer, G, Rauterberg, G, Rhode, W, Rivero, R, Röhring, A, Sahakian, V, Samorski, M, Sanchez, JA, Schmele, D, Schmidt, T, Stamm, W, Ulrich, M, Völk, HJ, Westerhoff, S, Wiebel-Sooth, B, Wiedner, CA, Willmer, M & Wirth, H 1997, 'Measurement of the flux, spectrum, and variability of TeV γ-rays from Mkn 501 during a state of high activity', Astronomy and Astrophysics, vol. 327, no. 2, pp. L5-L8.

TY - JOUR

T1 - Measurement of the flux, spectrum, and variability of TeV γ-rays from Mkn 501 during a state of high activity

AU - Aharonian, F.

AU - Akhperjanian, A. G.

AU - Barrio, J. A.

AU - Bernlöhr, K.

AU - Beteta, J. J.G.

AU - Bradbury, S. M.

AU - Contreras, J. L.

AU - Cortina, J.

AU - Daum, A.

AU - Deckers, T.

AU - Feigl, E.

AU - Fernandez, J.

AU - Fonseca, V.

AU - Fraß, A.

AU - Funk, B.

AU - Gonzalez, J. C.

AU - Haustein, V.

AU - Heinzelmann, G.

AU - Hemberger, M.

AU - Hermann, G.

AU - Heß, M.

AU - Heusler, A.

AU - Hofmann, W.

AU - Holl, I.

AU - Horns, D.

AU - Kankanian, R.

AU - Kirstein, O.

AU - Köhler, C.

AU - Konopelko, A.

AU - Kornmayer, H.

AU - Kranich, D.

AU - Krawczynski, H.

AU - Lampeitl, H.

AU - Lindner, A.

AU - Lorenz, E.

AU - Magnussen, N.

AU - Meyer, H.

AU - Mirzoyan, R.

AU - Möller, H.

AU - Moralejo, A.

AU - Padilla, L.

AU - Panter, M.

AU - Petry, D.

AU - Plaga, R.

AU - Prahl, J.

AU - Prosch, C.

AU - Pühlhofer, G.

AU - Rauterberg, G.

AU - Rhode, W.

AU - Rivero, R.

AU - Röhring, A.

AU - Sahakian, V.

AU - Samorski, M.

AU - Sanchez, J. A.

AU - Schmele, D.

AU - Schmidt, T.

AU - Stamm, W.

AU - Ulrich, M.

AU - Völk, H. J.

AU - Westerhoff, S.

AU - Wiebel-Sooth, B.

AU - Wiedner, C. A.

AU - Willmer, M.

AU - Wirth, H.

PY - 1997/11/10

Y1 - 1997/11/10

N2 - Between March 16, 1997 and April 14, 1997, a high flux level of TeV γ-rays was observed from Mkn 501, using the HEGRA stereoscopic system of four imaging Cherenkov telescopes. The flux level varied during this period from about one half up to six times the flux 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 differential energy spectrum of the radiation follows a power law from 1 TeV to 10 TeV. The differential spectral index of 2.47 ±0.07 ± 0.25 is close to that of the Crab Nebula of 2.66 ± 0.12 ± 0.25.

AB - Between March 16, 1997 and April 14, 1997, a high flux level of TeV γ-rays was observed from Mkn 501, using the HEGRA stereoscopic system of four imaging Cherenkov telescopes. The flux level varied during this period from about one half up to six times the flux 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 differential energy spectrum of the radiation follows a power law from 1 TeV to 10 TeV. The differential spectral index of 2.47 ±0.07 ± 0.25 is close to that of the Crab Nebula of 2.66 ± 0.12 ± 0.25.

KW - BL Lacertae objects: individual: Mkn 501

KW - Gamma rays: observations

UR - https://www.scopus.com/pages/publications/6244248083

M3 - Article

AN - SCOPUS:6244248083

SN - 0004-6361

VL - 327

SP - L5-L8

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 2

ER -

Measurement of the flux, spectrum, and variability of TeV γ-rays from Mkn 501 during a state of high activity

Abstract

Keywords

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