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Title: Discovery of very high energy γ-ray emission from the BL Lacertae object H 2356-309 with the HESS Cherenkov telescopes
Authors: Aharonian, F.
Benbow, W.
Berge, D.
Bernlöhr, K.
Bolz, O.
Braun, I.
Bühler, R.
Carrigan, S.
Costamante, L.
Egberts, K.
Funk, S.
Ouchrif, M.
Tluczykont, M.
Tluczykont, M.
Hermann, G.
Hinton, J. A.
Hofmann, W.
Khélifi, B.
Masterson, C.
Panter, M.
Rowell, G.
Sahakian, V.
van Eldik C
Völk, H. J.
Akhperjanian, A. G.
Bazer-Bachi, A. R.
Borrel, V.
Marcowith, A.
Beilicke, M.
Cornils, R.
Heinzelmann, G.
Raue, M.
Ripken, J.
Bernlöhr, K.
Konopelko, A.
Breitling, F.
Funk, S.
Komin, N.
Lohse, T.
Schlenker, S.
Schwanke, U.
Stegmann, C.
Boisson, C.
Martin, J. M.
Sol, H.
Brown, A. M.
Chadwick, P. M.
le Gallou R
Dickinson, H. J.
Hadjichristidis, C.
Latham, I. J.
McComb, T. J. L.
Nolan, S. J.
Noutsos, A.
Orford, K. J.
Osborne, J. L.
Rayner, S. M.
Spangler, D.
Ward, M.
Büsching, I.
Venter, C.
Holleran, M.
de Jager OC
Raubenheimer, B. C.
Chounet, L. -. M.
Degrange, B.
Dubus, G.
Fontaine, G.
Giebels, B.
Khélifi, B.
Lemoine-Goumard, M.
Superina, G.
Tluczykont, M.
Pita, S.
Djannati-Ataï, A.
Espigat, P.
Lemière, A.
Punch, M.
Terrier, R.
Théoret, C. G.
Drury, L. O.
Emmanoulopoulos, D.
Ferrero, E.
Hauser, M.
Hinton, J. A.
Pühlhofer, G.
Jacholkowska, A.
Wagner, S. J.
Feinstein, F.
Gallant, Y. A.
Vasileiadis, G.
Glicenstein, J. F.
Goret, P.
Rolland, L.
Henri, G.
Pelletier, G.
Saugé, L.
Horns, D.
Martineau-Huynh, O.
Vincent, P.
de Naurois M
Ouchrif, M.
Tavernet, J. -. P.
Nedbal, D.
Rob, L.
Reimer, A.
Reimer, O.
Schlickeiser, R.
Spanier, F.
Steenkamp, R.
Costamante, L.
Masterson, C.
Hauser, D.
First Published: Aug-2006
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2006, 455 (2), pp. 461-466
Abstract: The extreme synchrotron BL Lac object H 2356-309, located at a redshift of z = 0.165, was observed from June to December 2004 with a total exposure of $\approx$40 h live-time with the HESS (High Energy Stereoscopic System) array of atmospheric-Cherenkov telescopes (ACTs). Analysis of this data set yields, for the first time, a strong excess of 453 $\gamma$-rays (10 standard deviations above background) from H 2356-309, corresponding to an observed integral flux above 200 GeV of I(>200 GeV) = (4.1 $\pm$ 0.5) $\times$ 10-12 cm-2 s-1 (statistical error only). The differential energy spectrum of the source between 200 GeV and 1.3 TeV is well-described by a power law with a normalisation (at 1 TeV) of N0 = (4.1 $\pm$ 0.5) $\times$ 10-13 cm-2 s-1 TeV-1 and a photon index of $\Gamma$ = $3.09\,\pm\,0.24_\mathrm{stat}\,\pm\,0.10_\mathrm{sys}$. H 2356-309 is one of the most distant BL Lac objects detected at very-high-energy $\gamma$-rays so far. Results from simultaneous observations from ROTSE-III (optical), RXTE (X-rays) and NRT (radio) are also included and used together with the HESS data to constrain a single-zone homogeneous synchrotron self-Compton (SSC) model. This model provides an adequate fit to the HESS data when using a reasonable set of model parameters.
DOI Link: 10.1051/0004-6361:20054732
ISSN: 0004-6361
eISSN: 1432-0746
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2006 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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