Discovery of VHE gamma ray from PKS 2005-489

Aharonian, Felix; Akhperjanian, A.G.; Aye, K.-M.; Bazer-Bachi, A. R.; Beilicke, M.; Benbow, W.; Berghaus, D. P.; Bernlöhr, K.; Boisson, C.; Bolz, O.; Braun, I.; Breitling, F.; Brown, A. M.; Bussons Gordo, J.; Chadwick, P. M.; Chounet, L.-M.; Cornils, R.; Costamante, L.; Degrange, B.; Djannati-Atai, A.; Drury, L. O'C.; Dubus, G.; Emmanoulopoulos, D.; Espigat, P.; Feinstein, F.; Fleury, P.; Goret, P.; Hadjichristidis, C.; Hauser, M.; Heinzelmann, G.; Henri, G.; Hermann, G.; Hinton, J.A.; Hofmann, W.; Holleran, M.; Horns, D.; de Jager, O. C.; Khélifi, B.; Komin, Nu.; Konopelko, A.; Latham, I. J.; Le Gallou, R.; Lemière, A.; Lemoine-Goumard, M.; Leroy, N.; Lohse, T.; Martineau-Huynh, O.; Marcowith, A.; Masterson, C.; McComb, T . J. L.; de Naurois, M.; Nolan, S. J.; Noutsos, A.; Orford, K. J.; Osborne, J. L.; Ouchrif, M.; Panter, M.; Pelletier, G.; Pita, S.; Pühlhofer, G.; Punch, M.; Raubenheimer, B. C.; Raue, M.; Raux, J.; Rayner, S. M.; Redondo, I.; Reimer, A.; Reimer, O.; Ripken, J.; Rob, L.; Rolland, L.; Rowell, G.; Sahakian, V.; Saugé, L.; Schlenker, S.; Schlickeiser, R.; Schuster, C.; Schwanke, U.; Siewert, M.; Sol, H.; Steenkamp, R.; Stegmann, C.; Tavernet, P.; Terrier, R.; Théoret, C. G.; Tluczykont, M.; Vasileiadis, G.; Venter, C.; Vincent, P.; Völk, H. J.; Wagner, S. J.; Fontaine, G.; Fuchs, Y.; Funk, S.; Gallant, Y.A.; Giebels, B.; Gillessen, S.; Glicenstein, J.F.

doi:10.1051/0004-6361:200500113

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Discovery of VHE gamma ray from PKS 2005-489

Aharonian, F., Akhperjanian, A., Aye, K.-M., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., et al. (2005). Discovery of VHE gamma ray from PKS 2005-489. Astronomy & Astrophysics, 436(1), L17-L20. doi:10.1051/0004-6361:200500113.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-88D1-6 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-88D2-4

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Creators:
Aharonian, Felix¹, Author
Akhperjanian, A.G.², Author
Aye, K.-M.², Author
Bazer-Bachi, A. R.², Author
Beilicke, M.¹, Author
Benbow, W.¹, Author
Berghaus, D. P.², Author
Bernlöhr, K.¹, Author
Boisson, C.², Author
Bolz, O.¹, Author
Braun, I.¹, Author
Breitling, F.², Author
Brown, A. M.², Author
Bussons Gordo, J.², Author
Chadwick, P. M.², Author
Chounet, L.-M.², Author
Cornils, R.¹, Author
Costamante, L.¹, Author
Degrange, B.², Author
Djannati-Atai, A.¹, Author
Drury, L. O'C.², AuthorDubus, G.¹, Author         Emmanoulopoulos, D.², AuthorEspigat, P.², AuthorFeinstein, F.¹, Author         Fleury, P.², AuthorGoret, P.², AuthorHadjichristidis, C.², AuthorHauser, M.², AuthorHeinzelmann, G.², AuthorHenri, G.², AuthorHermann, G.¹, Author         Hinton, J.A.¹, Author         Hofmann, W.¹, Author         Holleran, M.², AuthorHorns, D.¹, Author         de Jager, O. C.², AuthorKhélifi, B.¹, Author         Komin, Nu.², AuthorKonopelko, A.³, Author         Latham, I. J.², AuthorLe Gallou, R.², AuthorLemière, A.², AuthorLemoine-Goumard, M.², AuthorLeroy, N.², AuthorLohse, T.², AuthorMartineau-Huynh, O.², AuthorMarcowith, A.², AuthorMasterson, C.¹, Author         McComb, T . J. L.², Authorde Naurois, M.¹, Author         Nolan, S. J.², AuthorNoutsos, A.², AuthorOrford, K. J.¹, Author         Osborne, J. L.¹, Author         Ouchrif, M.², AuthorPanter, M.¹, Author         Pelletier, G.², AuthorPita, S.², AuthorPühlhofer, G.¹, Author         Punch, M.², AuthorRaubenheimer, B. C.², AuthorRaue, M.¹, Author         Raux, J.², AuthorRayner, S. M.², AuthorRedondo, I.², AuthorReimer, A.², AuthorReimer, O.², AuthorRipken, J.², AuthorRob, L.², AuthorRolland, L.², AuthorRowell, G.¹, Author         Sahakian, V.², AuthorSaugé, L.¹, Author         Schlenker, S.², AuthorSchlickeiser, R.², AuthorSchuster, C.², AuthorSchwanke, U.², AuthorSiewert, M.², AuthorSol, H.², AuthorSteenkamp, R.², AuthorStegmann, C.², AuthorTavernet, P.², AuthorTerrier, R.², AuthorThéoret, C. G.², AuthorTluczykont, M.², AuthorVasileiadis, G.¹, Author         Venter, C.², AuthorVincent, P.², AuthorVölk, H. J.³, Author         Wagner, S. J.², AuthorFontaine, G.², AuthorFuchs, Y.², AuthorFunk, S.¹, Author         Gallant, Y.A.², AuthorGiebels, B.², AuthorGillessen, S.¹, Author         Glicenstein, J.F.¹, Author          more..

Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550
2Yerevan Physics Institute, Armenia University of Durhan, Department of Physics, UK Centre d'Etudes Spatiales des Rayonnements, CNRS/UPS Toulouse, France Universität Hamburg, Institut für Experimentalphysik, Germany LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, France Groupe d'astroparticules de Montpellier, IN2P3/CNRS, Université Montpellier II, France Laboratoire Leprince-Ringuet, IN2P3/CNRS, Ecole polytechnique, Palaiseau, France European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG Dublin Institute for Advanced Studies, Ireland Landessternwarte, Königstuhl, Heidelberg, Germany Laboratoire d'astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, France DAPNIA/DSM/CEA, CE Saclay, Gif-sur-Yvette, France Unit for Space Physics, North-West University, Potchefstroom, South Africa Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Paris VI & VII, France Institut für Theoretische Physik, Lehrstuhl IV, Ruhr-Universität Bochum, Germany Institute of Particle and Nuclear Physics, Charles University, Prague, Czech Republic University of Namibia, Windhoek, Namibia APC, Paris, France, ou_persistent22
3Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_907548

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Free keywords: galaxie: active -- BL Lacertae objects: individual : PKS 2005-489 -- gamma rays: observations

Abstract: The high-frequency peaked BL Lac PKS 2005-489 (z=0.071) was observed in 2003 and 2004 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. A signal was detected at the 6.7 ο level in the 2004 observations (24.2 h live time), but not in the 2003 data set (27.3 h live time). PKS 2005-489 is the first blazar independently discovered by HESS to be an emitter of VHE photons, and only the second such blazar in the Southern Hemisphere. The integral flux above 200 GeV observed in 2004 is (6.9 ± 1.0 ± 1.4_syst) x 10^-12 cm^-2 s^-1, corresponding to ~2.5% of the flux observed from the Crab Nebula. The 99% upper limit on the flux in 2003, I(>200 GeV)5.2x10^-12 cm^-2 s^-1, is smaller than the flux measured in 2004, suggesting an increased level of activity in 2004. However, the data show no evidence for significant variability on any time scale less than a year. An energy spectrum is measured and is characterized by a very soft power law (photon index of Γ = 4.0 ± 0.4).

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Language(s): eng - English

Dates: Date issued: 2005-06-02

Publication Status: Issued

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Identifiers: eDoc: 223148
DOI: 10.1051/0004-6361:200500113

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Title: Astronomy & Astrophysics

Alternative Title : A&A

Source Genre: Journal

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Pages: - Volume / Issue: 436 (1) Sequence Number: - Start / End Page: L17 - L20 Identifier: -