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Discovery of very high energy γ-ray emission from the BL Lacertae object H 2356-309 with the HESS Cherenkov telescopes

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dc.contributor.authorAharonian, F.
dc.contributor.authorAkhperjanian, A.
dc.contributor.authorBazer-Bachi, A.
dc.contributor.authorBeilicke, M.
dc.contributor.authorBenbow, W.
dc.contributor.authorBerge, D.
dc.contributor.authorBernlohr, K.
dc.contributor.authorBoisson, C.
dc.contributor.authorBolz, O.
dc.contributor.authorBorrel, V.
dc.contributor.authorBraun, I.
dc.contributor.authorBreitling, F.
dc.contributor.authorBrown, A.
dc.contributor.authorBuhler, R.
dc.contributor.authorBusching, I.
dc.contributor.authorCarrigan, S.
dc.contributor.authorChadwick, P.
dc.contributor.authorChounet, L.
dc.contributor.authorCornils, R.
dc.contributor.authorCostamante, L.
dc.contributor.authoret al.
dc.date.issued2006
dc.description.abstractThe 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 ≈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 γ-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 ±0.5) × 10 <sup>-12</sup> cm <sup>-2</sup> s <sup>-1</sup> (statistical error only). The differential energy spectrum of the source between 200 GeV and 1.3TeV is well-described by a power law with a normalisation (at 1 TeV) of N <inf>0</inf> = (3.00 ±0.80 <inf>stat</inf> ± 0.31 <inf>sys</inf>)× 10 <sup>-13</sup> cm <sup>-2</sup> s <sup>-1</sup>TeV <sup>-1</sup> and a photon index of Γ = 3.09 ± 0.24 <inf>stat</inf> ± 0.10 <inf>sys</inf>. H 2356-309 is one of the most distant BL Lac objects detected at very-high-energy γ-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. © ESO 2006.
dc.description.statementofresponsibilityF. Aharonian ... G. Rowell ...and M.Ward [et al]
dc.identifier.citationAstronomy and Astrophysics (A & A), 2006; 455(2):461-466
dc.identifier.doi10.1051/0004-6361:20054732
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.orcidRowell, G. [0000-0002-9516-1581]
dc.identifier.urihttp://hdl.handle.net/2440/37507
dc.language.isoen
dc.publisherE D P Sciences
dc.rights© The European Southern Observatory 2006
dc.source.urihttps://doi.org/10.1051/0004-6361:20054732
dc.subjectgamma rays: observations
dc.subjectgalaxies: active
dc.subjectgalaxies: BL Lacertae objects: individual: H 2356-309
dc.titleDiscovery of very high energy γ-ray emission from the BL Lacertae object H 2356-309 with the HESS Cherenkov telescopes
dc.title.alternativeDiscovery of very high energy gamma-ray emission from the BL Lacertae object H 2356-309 with the HESS Cherenkov telescopes
dc.typeJournal article
pubs.publication-statusPublished

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