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Upper limits to the SN1006 multi-TeV gamma-ray flux from HESS observations

Aharonian, F. / G. Akhperjanian, A. / Aye, K.-M. / R. Bazer-Bachi, A. / Beilicke, M. / Benbow, W. / Berge, D. / Berghaus, P. / Bernlöhr, K. / Boisson, C. / Bolz, O. / Borgmeier, C. / Breitling, F. / M. Brown, A. / Bussons Gordo, J. / M. Chadwick, P. / Chounet, L.-M. / Cornils, R. / Costamante, L. / Degrange, B. / Djannati-Ataï, A. / O'C. Drury, L. / Dubus, G. / Ergin, T. / Espigat, P. / Feinstein, F. / Fleury, P. / Fontaine, G. / Funk, S. / Gallant, Y.A. / Giebels, B. / Gillessen, S. / Goret, P. / Hadjichristidis, C. / Hauser, M. / Heinzelmann, G. / Henri, G. / Hermann, G. / A. Hinton, J. / Hofmann, W. / Holleran, M. / Horns, D. / C. De Jager, O. / Jung, I. / Khélifi, B. / Komin, Nu. / Konopelko, A. / J. Latham, I. / Le Gallou, R. / Lemière, A. / Lemoine, M. / Leroy, N. / Lohse, T. / Marcowith, A. / Masterson, C. / J. L. Mccomb, T. / De Naurois, M. / J. Nolan, S. / Noutsos, A. / J. Orford, K. / L. Osborne, J. / Ouchrif, M. / Panter, M. / Pelletier, G. / Pita, S. / Pühlhofer, G. / Punch, M. / C. Raubenheimer, B. / Raue, M. / Raux, J. / M. Rayner, S. / Redondo, I. / Reimer, A. / Reimer, O. / Ripken, J. / Rob, L. / Rolland, L. / P. Rowell, G. / Sahakian, V. / Saugé, L. / Schlenker, S. / Schlickeiser, R. / Schuster, C. / Schwanke, U. / Siewert, M. / Sol, H. / Steenkamp, R. / Stegmann, C. / Tavernet, J.-P. / Théoret, C.G. / Tluczykont, M. / J. Van Der Walt, D. / Vasileiadis, G. / Vincent, P. / Visser, B. / J. Völk, H. / J. Wagner, S. - 2015
Observations of the shell-type supernova remnant SN1006 have been carried out with the HESS system of Cherenkov telescopes during 2003 (18.2 h with two operating telescopes) and 2004 (6.3 h with all four telescopes). No evidence for TeV $\gamma$-ray emission from any compact or extended region associated with the remnant is seen and resulting upper limits at the 99.9% confidence level are up to a factor 10 lower than previously-published fluxes from CANGAROO. For SN1006 at its current epoch of evolution we define limits for a number of important global parameters. Upper limits on the $\gamma$-ray luminosity (for E = 0.26 to 10 TeV, distance d = 2 kpc) of $L_\gamma < 1.7$ $\times$ 1033 erg s-1, and the total energy in corresponding accelerated protons, $W_{\rm p}<1.6$ $\times$ 1050 erg are estimated (for proton energies $E_{\rm p} \sim 1.5$ to 60 TeV and assuming the lowest value n=0.05 cm-3 of the ambient target density discussed in literature). Extending this estimate to cover the range of proton energies observed in the cosmic ray spectrum up to the knee (we take here $E_{\rm p} \sim$ 1 GeV to 3 PeV, assuming a differential particle index -2) gives $W_{\rm p}<6.3$ $\times$ 1050 erg. A lower limit on the post-shock magnetic field of $B>25~\mu$G results when considering the synchrotron/inverse-Compton framework for the observed X-ray flux and $\gamma$-ray upper limits.

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