# Implications of HESS observations of pulsar wind nebulae

1 APC - AHE - APC - Astrophysique des Hautes Energies
APC (UMR_7164) - AstroParticule et Cosmologie, Dipartimento di Astronomia, Universita degli Studi di Bologna
Abstract : In this review paper on pulsar wind nebulae (PWN) we discuss the properties of such nebulae within the context of containment against cross-field diffusion (versus normal advection), the effect of reverse shocks on the evolution of offset "Vela-like'' PWN, constraints on maximum particle energetics, magnetic field strength estimates based on spectral and spatial properties, and the implication of such field estimates on the composition of the wind. A significant part of the discussion is based on the High Energy Stereoscopic System ({\it H.E.S.S.} or {\it HESS}) detection of the two evolved pulsar wind nebulae Vela X (cocoon) and HESS J1825-137. In the case of Vela X (cocoon) we also review evidence of a hadronic versus a leptonic interpretation, showing that a leptonic interpretation is favored for the {\it HESS} signal. The constraints discussed in this review paper sets a general framework for the interpretation of a number of offset, filled-center nebulae seen by {\it HESS}. These sources are found along the galactic plane with galactic latitudes $|b|\sim 0$, where significant amounts of molecular gas is found. In these regions, we find that the interstellar medium is inhomogeneous, which has an effect on the morphology of supernova shock expansion. One consequence of this effect is the formation of offset pulsar wind nebulae as observed.
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http://hal.in2p3.fr/in2p3-00319469
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Submitted on : Monday, September 8, 2008 - 3:10:50 PM
Last modification on : Friday, October 30, 2020 - 12:04:02 PM

### Citation

O.C. de Jager, A. Djannati-Ataï. Implications of HESS observations of pulsar wind nebulae. Becker W. Neutron Stars and Pulsars, Springer, pp.451, 2009, Astrophysics And Space Science Library, ⟨10.1007/978-3-540-76965-1⟩. ⟨in2p3-00319469⟩

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