TeV gamma-ray light curve and energy spectrum of Mkn 421 during its 2001 flare 
as measured with HEGRA CT1

Aharonian, F. A.; Akhperjanian, A. G.; Beilicke, M.; Bernlöhr, K.; Bojahr, H.; Bolz, O.; Borst, H.; Coarasa, T.; Contreras, J. L.; Cortina, J.; Denninghoff, S.; Fonseca, V.; Girma, M.; Gotting, N.; Heinzelmann, G.; Hermann, G.; Heusler, A.; Hofmann, W.; Horns, D.; Jung, I.; Kankanyan, R.; Kestel, M.; Kohnle, A.; Konopelko, A.; Kornmeyer, H.; Kranich, D.; Krawczynski, H.; Lampeitl, H.; Lopez, M.; Lorenz, E.; Lucarelli, F.; Mang, O.; Meyer, H.; Mirzoyan, R.; Moralejo, A.; Ona, E.; Panter, M.; Plyasheshnikov, A.; Pühlhofer, G.; Rauterberg, G.; Reyes, R.; Rhode, W.; Ripken, J.; Rohring, A.; Rowell, G. P.; Sahakian, V.; Samorski, M.; Schilling, M.; Schweizer, T.; Sevilla, I.; Siems, M.; Sobczynska, D.; Stamm, W.; Tluczykont, M.; Tonello, N.; Vitale, V.; Völk, H.J.; Wagner, R.M.; Wiedner, C.A.; Wittek, W.

doi:DOI: 10.1051/0004-6361:20031265

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TeV gamma-ray light curve and energy spectrum of Mkn 421 during its 2001 flare as measured with HEGRA CT1

Aharonian, F. A., Akhperjanian, A. G., Beilicke, M., Bernlöhr, K., Bojahr, H., Bolz, O., et al. (2003). TeV gamma-ray light curve and energy spectrum of Mkn 421 during its 2001 flare as measured with HEGRA CT1. Astronomy & Astrophysics, 410(3), 813-821. doi:DOI: 10.1051/0004-6361:20031265.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-8DCC-A Version Permalink: https://hdl.handle.net/11858/00-001M-0000-002D-D6F9-C

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Creators:
Aharonian, F. A.¹, Author
Akhperjanian, A. G.¹, Author
Beilicke, M.¹, Author
Bernlöhr, K.¹, Author
Bojahr, H.², Author
Bolz, O.¹, Author
Borst, H.², Author
Coarasa, T.², Author
Contreras, J. L.², Author
Cortina, J.², Author
Denninghoff, S.², Author
Fonseca, V.², Author
Girma, M.¹, Author
Gotting, N.², Author
Heinzelmann, G.², Author
Hermann, G.¹, Author
Heusler, A.¹, Author
Hofmann, W.¹, Author
Horns, D.¹, Author
Jung, I.¹, Author
Kankanyan, R.¹, Author         Kestel, M.², AuthorKohnle, A.¹, Author         Konopelko, A.³, Author         Kornmeyer, H.², AuthorKranich, D.², AuthorKrawczynski, H.¹, Author         Lampeitl, H.¹, Author         Lopez, M.², AuthorLorenz, E.², AuthorLucarelli, F.², AuthorMang, O.², AuthorMeyer, H.², AuthorMirzoyan, R.², AuthorMoralejo, A.², AuthorOna, E.², AuthorPanter, M.¹, Author         Plyasheshnikov, A.¹, Author         Pühlhofer, G.¹, Author         Rauterberg, G.², AuthorReyes, R.², AuthorRhode, W.², AuthorRipken, J.², AuthorRohring, A.², AuthorRowell, G. P.¹, Author         Sahakian, V.², AuthorSamorski, M.², AuthorSchilling, M.¹, Author         Schweizer, T.², AuthorSevilla, I.², AuthorSiems, M.², AuthorSobczynska, D.², AuthorStamm, W.², AuthorTluczykont, M.², AuthorTonello, N.¹, Author         Vitale, V.¹, Author         Völk, H.J.³, Author         Wagner, R.M.¹, Author         Wiedner, C.A.¹, Author         Wittek, W.¹, Author          more..

Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550
2Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany; Univ Complutense, Fac Ciencias Fis, E-28040 Madrid, Spain; Univ Hamburg, Inst Phys Expt, D-22761 Hamburg, Germany; Univ Kiel, Inst Expt & Angew Phys, D-24118 Kiel, Germany; Univ Wuppertal, Fachbereich Phys, D-42097 Wuppertal, Germany; Yerevan Phys Inst, Yerevan 375036, Armenia, ou_persistent22
3Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_907548

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Free keywords: gamma rays: observations - BL Lacertae objects: individual: Mkn 421

Abstract: In the first months of 2001 the AGN Mkn 421 showed highly variable, strong TeV activity at flux levels frequently exceeding 1 Crab. Here we present the light curve and energy spectrum of Mkn 421 as measured with the HEGRA stand alone telescope CT1. Around 30% of the data were taken under moonlight conditions. The spectrum shows a significant exponential energy cutoff at around 3.4 TeV. The results from the dark night- and the moon data are in excellent agreement with each other. A significant spectral shape variation depending on the flux level has been found. The TeV light curve is also found to be highly correlated with the X-ray light curve of the RXTE / ASM satellite, showing no significant time lag larger than 0.2 d. The derived correlation coefficient of 0.83 corresponds to a 5.2 sigma significance.

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Language(s): eng - English

Dates: Date issued: 2003-11-02

Publication Status: Issued

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Rev. Type: Peer

Identifiers: eDoc: 57864
DOI: DOI: 10.1051/0004-6361:20031265

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Title: Astronomy & Astrophysics

Alternative Title : Astron. Astrophys.

Source Genre: Journal

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Pages: - Volume / Issue: 410 (3) Sequence Number: - Start / End Page: 813 - 821 Identifier: -