Large zenith angle observations of Mkn 421 with H.E.S.S.

Horns, D.; D. Horns for the H.E.S.S. Collaboration

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Large zenith angle observations of Mkn 421 with H.E.S.S.

Horns, D. (2005). Large zenith angle observations of Mkn 421 with H.E.S.S. In B. S. Acharya, S. Gupta, P. Jagadeesan, A. Jain, S. Karthikeyan, S. Morris, et al. (Eds.), Proceedings of the 29th International Cosmic Ray Conference (pp. 319-322). Navy Nagar, Colaba, Mumbai, MH-400005: Tata Institute of Fundamental Research.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-87B3-5 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-87B4-3

Genre: Conference Paper

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Creators:
Horns, D.¹, Author
D. Horns for the H.E.S.S. Collaboration, Editor

Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550

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Abstract: Mkn 421 was observed during 2004 with the fully operational High Energy Stereoscopic System (H.E.S.S.) in Namibia. The observations were carried out at zenith angles of 60°-67°, which result in an average energy threshold of 1.5 TeV and a collection area reaching 2 km² at 10 TeV. The light-curve of integrated fluxes above 2 TeV shows changes of the diurnal ux up to a factor of 4.3. For nights of high flux, intra-night variability is detected with a decay time of less than 1 hour. The time averaged energy spectrum is curved and is well described by a power-law with a photon index 2.1±0.1 and an exponential cutoff at 3.1 (+0.5 - 0.4)TeV and an average integral flux above 2 TeV of 3 Crab ux units. Significant variations of the spectral shape are detected with a spectral hardening as the ux increases. Contemporaneous multi-wavelength observations at lower energies (X-rays and gamma-rays above ± 300 GeV) indicate smaller relative variability amplitudes than seen above 2 TeV during the high flux state.

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Language(s): eng - English

Dates: Date issued: 2005-12

Publication Status: Issued

Pages: -

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Table of Contents: -

Rev. Type: -

Identifiers: eDoc: 282119

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Title: 29th International Cosmic Ray Conference

Place of Event: Pune, India

Start-/End Date: 2005-08-03 - 2005-08-10

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Title: Proceedings of the 29th International Cosmic Ray Conference

Source Genre: Proceedings

Creator(s):
Acharya, B. Sripathi, Editor
Gupta, Sunil, Editor
Jagadeesan, P., Editor
Jain, Atul, Editor
Karthikeyan, S., Editor
Morris, Samuel, Editor
Tonwar, Suresh, Editor

Affiliations:
-

Publ. Info: Navy Nagar, Colaba, Mumbai, MH-400005 : Tata Institute of Fundamental Research

Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 319 - 322 Identifier: -