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  • TeV γ-ray observations of t...
    Abramowski, A; Benkhali, F. Ait; Angüner, E; Anton, G; Balzer, A; Tjus, J. Becker; Bernlöhr, K; Bissaldi, E; Biteau, J; Böttcher, M; Boisson, C; Brucker, J; Bulik, T; Carrigan, S; Cerruti, M; Chadwick, P.M; Chalme-Calvet, R; Chaves, R. C. G; Couturier, C; Dalton, M; Dickinson, H. J; Djannati-Ataï, A; Domainko, W; Drury, L. O'C; Dubus, G; Dutson, K; Edwards, T; Farnier, C; Förster, A; Gallant, Y. A; Garrigoux, T; Grondin, M.-H; Grudzińska, M; Häffner, S; Hahn, J; Henri, G; Hermann, G; Hervet, O; Hinton, J.A; Holler, M; Jacholkowska, A; Katz, U; Kaufmann, S; Khélifi, B; Kieffer, M; Kneiske, T; Kolitzus, D; Krayzel, F; Krüger, P. P; Laffon, H; Lamanna, G; Lemoine-Goumard, M; Lopatin, A; Marandon, V; Marcowith, A; Marx, R; Maurin, G; Méhault, J; Meintjes, P. J; Meyer, M; Moderski, R; Naumann, C. L; Niemiec, J; Nolan, S.J; Oakes, L; Ohm, S; Opitz, B; Petrucci, P.-O; Poon, H; Pühlhofer, G; Punch, M; Raab, S; Reimer, A; Reimer, O; Renaud, M; Rowell, G; Rudak, B; Rulten, C.B; Sahakian, V; Sanchez, D.A; Santangelo, A; Schwemmer, S; Sol, H; Stegmann, C; Stycz, K; Szostek, A; Tavernier, T; Taylor, A.M; Tluczykont, M; Valerius, K; van Soelen, B; Vasileiadis, G; Venter, C; Vincent, P; Wagner, P; Ward, M; Wierzcholska, A; Zabalza, V; Zajczyk, A; Zech, A

    Monthly notices of the Royal Astronomical Society, 06/2014, Letnik: 441, Številka: 1
    Journal Article

    The non-thermal nature of the X-ray emission from the shell-type supernova remnants (SNRs) G1.9+0.3 and G330.2+1.0 is an indication of intense particle acceleration in the shock fronts of both objects. This suggests that the SNRs are prime candidates for very-high-energy (VHE; E > 0.1 TeV) γ-ray observations. G1.9+0.3, recently established as the youngest known SNR in the Galaxy, also offers a unique opportunity to study the earliest stages of SNR evolution in the VHE domain. The purpose of this work is to probe the level of VHE γ-ray emission from both SNRs and use this to constrain their physical properties. Observations were conducted with the H.E.S.S. (High Energy Stereoscopic System) Cherenkov Telescope Array over a more than six-year period spanning 2004–2010. The obtained data have effective livetimes of 67 h for G1.9+0.3 and 16 h for G330.2+1.0. The data are analysed in the context of the multiwavelength observations currently available and in the framework of both leptonic and hadronic particle acceleration scenarios. No significant γ-ray signal from G1.9+0.3 or G330.2+1.0 was detected. Upper limits (99 per cent confidence level) to the TeV flux from G1.9+0.3 and G330.2+1.0 for the assumed spectral index Γ = 2.5 were set at 5.6 × 10−13 cm−2 s−1 above 0.26 TeV and 3.2 × 10−12 cm−2 s−1 above 0.38 TeV, respectively. In a one-zone leptonic scenario, these upper limits imply lower limits on the interior magnetic field to B G1.9 ≳ 12 μG for G1.9+0.3 and to B G330 ≳ 8 μG for G330.2+1.0. In a hadronic scenario, the low ambient densities and the large distances to the SNRs result in very low predicted fluxes, for which the H.E.S.S. upper limits are not constraining.