%0 Journal Article
%T A possible association of the new VHE gamma-ray source HESS J1825--137 with the pulsar wind nebula G18.0--0.7
%+ Laboratoire Leprince-Ringuet (LLR)
%+ AstroParticule et Cosmologie (APC (UMR_7164))
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%+ Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE)
%A Aharonian, F.A.
%A Akhperjanian, A.G.
%A Bazer-Bachi, A.R.
%A Beilicke, M.
%A Benbow, W.
%A Berge, D.
%A Bernlohr, K.
%A Boisson, C.
%A Bolz, O.
%A Borrel, V.
%A Braun, I.
%A Breitling, F.
%A Brown, A.M.
%A Chadwick, P.M.
%A Chounet, L.-M.
%A Cornils, R.
%A Costamante, L.
%A Degrange, B.
%A Dickinson, H.J.
%A Djannati-Ataï, A.
%A Drury, L.O'C.
%A Dubus, G.
%A Emmanoulopoulos, D.
%A Espigat, P.
%A Feinstein, F.
%A Fontaine, G.
%A Fuchs, Y.
%A Funk, S.
%A Gallant, Y.A.
%A Giebels, B.
%A Gillessen, S.
%A Glicenstein, J.F.
%A Goret, P.
%A Hadjichristidis, C.
%A Hauser, M.
%A Heinzelmann, G.
%A Henri, G.
%A Hermann, G.
%A Hinton, J.A.
%A Hofmann, W.
%A Holleran, M.
%A Horns, D.
%A Jacholkowska, A.
%A de Jager, O.C.
%A Khelifi, B.
%A Komin, Nu.
%A Konopelko, A.
%A Latham, I.J.
%A Le Gallou, R.
%A Lemiere, A.
%A Lemoine-Goumard, M.
%A Leroy, N.
%A Lohse, T.
%A Martin, J.M.
%A Martineau-Huynh, O.
%A Marcowith, A.
%A Masterson, C.
%A Mccomb, T.J.L.
%A de Naurois, M.
%A Nolan, S.J.
%A Noutsos, A.
%A Orford, K.J.
%A Osborne, J.L.
%A Ouchrif, M.
%A Panter, M.
%A Pelletier, G.
%A Pita, S.
%A Puhlhofer, G.
%A Punch, M.
%A Raubenheimer, B.C.
%A Raue, M.
%A Raux, J.
%A Rayner, S.M.
%A Reimer, A.
%A Reimer, O.
%A Ripken, J.
%A Rob, L.
%A Rolland, L.
%A Rowell, G.
%A Sahakian, V.
%A Sauge, L.
%A Schlenker, S.
%A Schlickeiser, R.
%A Schuster, C.
%A Schwanke, U.
%A Siewert, M.
%A Sol, H.
%A Spangler, D.
%A Steenkamp, R.
%A Stegmann, C.
%A Tavernet, J.-P.
%A Terrier, R.
%A Theoret, C.G.
%A Tluczykont, M.
%A Vasileiadis, G.
%A Venter, C.
%A Vincent, P.
%A Volk, H.J.
%A Wagner, S.J.
%Z 5 pages, 3 figures, to appear in Astronomy and Astrophysics Letters
%< avec comité de lecture
%Z APC-05-80
%@ 0004-6361
%J Astronomy and Astrophysics - A&A
%I EDP Sciences
%V 442
%P L25-L29
%8 2005
%D 2005
%Z astro-ph/0510394
%R 10.1051/0004-6361:200500180
%Z Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]Journal articles
%X We report on a possible association of the recently discovered very high-energy $\gamma$-ray source HESS J1825--137 with the pulsar wind nebula (commonly referred to as G 18.0--0.7) of the $2.1\times 10^{4}$ year old Vela-like pulsar PSR B1823--13. HESS J1825--137 was detected with a significance of 8.1 $\sigma$ in the Galactic Plane survey conducted with the H.E.S.S. instrument in 2004. The centroid position of HESS J1825--137 is offset by 11\arcmin south of the pulsar position. \emph{XMM-Newton} observations have revealed X-ray synchrotron emission of an asymmetric pulsar wind nebula extending to the south of the pulsar. We argue that the observed morphology and TeV spectral index suggest that HESS J1825--137 and G 18.0--0.7 may be associated: the lifetime of TeV emitting electrons is expected to be longer compared to the {\it XMM-Newton} X-ray emitting electrons, resulting in electrons from earlier epochs (when the spin-down power was larger) contributing to the present TeV flux. These electrons are expected to be synchrotron cooled, which explains the observed photon index of $\sim 2.4$, and the longer lifetime of TeV emitting electrons naturally explains why the TeV nebula is larger than the X-ray size. Finally, supernova remnant expansion into an inhomogeneous medium is expected to create reverse shocks interacting at different times with the pulsar wind nebula, resulting in the offset X-ray and TeV $\gamma$-ray morphology.
%G English
%Z HESS
%L in2p3-00025035
%U https://hal.in2p3.fr/in2p3-00025035
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