On the intrinsic spectrum of PKS 2155-304 from HESS 2003 data

Costamante, L.; Benbow, W.; Horns, D.; Reimer, A.; Reimer, O.

doi:10.1063/1.1878444

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On the intrinsic spectrum of PKS 2155-304 from HESS 2003 data

Costamante, L., Benbow, W., Horns, D., Reimer, A., & Reimer, O. (2005). On the intrinsic spectrum of PKS 2155-304 from HESS 2003 data. In F. A. Aharonian, H. J. Völk, & D. Horns (Eds.), 2nd International Symposium on High Energy Gamma-Ray Astronomy, AIP Conference Proceedings (pp. 449-454). New York, NY, USA: American Institute of Physics.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-897A-4 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-897B-2

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Creators:
Costamante, L.¹, Author
Benbow, W.¹, Author
Horns, D.¹, Author
Reimer, A.², Author
Reimer, O.², Author

Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550
2Yerevan Physics Institute, 2 Alikhanian Brothers Street, 375036 Yerevan, Armenia. Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK. Centre d'Etude Spatiale des Rayonnements, CNRS/UPS, 9 av. du Colonel Roche, BP 4346, F-31029 Toulouse Cedex 4, France. Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany. APC, UMR 7164 du CNRS, 11 Place Marcelin Berthelot, F-75231 Paris Cedex 05, France. Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany. Laboratoire Univers et Théories (LUTH), UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, F-92195 Meudon Cedex, France. Laboratoire de Physique Théorique et Astroparticules, IN2P3/CNRS, Université Montpellier II, CC 70, Place Eugène Bataillon, F-34095 Montpellier Cedex 5, France. Laboratoire Leprince-Ringuet, IN2P3/CNRS, Ecole Polytechnique, F-91128 Palaiseau, France. Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland. Landessternwarte, Königstuhl, D-69117 Heidelberg, Germany. Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, F-38041 Grenoble Cedex 9, France. DAPNIA/DSM/CEA, CE Saclay, F-91191 Gif-sur-Yvette, France. Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa. Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Universités Paris VI & VII, 4 Place Jussieu, F-75252 Paris Cedex 05, France. Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany. Institute of Particle and Nuclear Physics (IPNP), Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic. University of Namibia, Private Bag 13301, Windhoek, Namibia., ou_persistent22

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Abstract: In 2003, PKS 2155-304 has been significantly detected by H.E.S.S. at Very High Energies (VHE), with an average spectrum of = 3.3. Due to absorption by the Extragalactic Background Light (EBL), the intrinsic spectrum is heavily modified both in shape and intensity. To correct for this effect, and locate the Inverse Compton (IC) peak of the Spectral Energy Distribution (SED), we used three EBL models (representatives of three different flux levels for the stellar peak component). The resulting TeV spectrum has a peak around 1 TeV for stellar peak fluxes above the Primack (2001) calculation, while the spectrum is steeper than = 2 (thus locating the IC peak < 200 GeV) for fluxes below. With bulk Lorentz factors = 20 – 30 (typically used for this object), in the first case the IC peak is in the Klein-Nishina transition region, while in the other case it is in the Thompson regime, and in agreement with the commonly fitted source parameters (e.g. [17]). The constraint on given by transparency to 2 TeV photons is > 19 (for historical SED fluxes and 2 hours variability timescale). ©2005 American Institute of Physics

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Language(s): eng - English

Dates: Date issued: 2005-02-21

Publication Status: Issued

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Identifiers: eDoc: 205967
DOI: 10.1063/1.1878444

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Title: International Symposium on High Energy Gamma-Ray Astronomy

Place of Event: Heidelberg, Germany

Start-/End Date: 2004-07-26 - 2004-07-30

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Title: 2nd International Symposium on High Energy Gamma-Ray Astronomy, AIP Conference Proceedings

Source Genre: Proceedings

Creator(s):
Aharonian, Felix A.¹, Editor
Völk, Heinrich J.², Editor
Horns, Dieter¹, Editor

Affiliations:
1 Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550
2 Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_907548

Publ. Info: New York, NY, USA : American Institute of Physics

Pages: 821 p. Volume / Issue: - Sequence Number: - Start / End Page: 449 - 454 Identifier: ISBN: 0-7354-0229-9

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Title: AIP Conference Proceedings

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Pages: - Volume / Issue: 745 Sequence Number: - Start / End Page: - Identifier: -