Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0188r&link_type=abstract
American Astronomical Society, HEAD meeting #9, #1.88; Bulletin of the American Astronomical Society, Vol. 38, p.343
Other
2
Scientific paper
Both integrated and spatially resolved spectra of several pulsar-wind nebulae (PWNe) are at odds with simple theory. For source gradients caused by outflow of relativistic particles and magnetic field, synchrotron-loss breaks can occur in the spectrum that are either larger or smaller than the homogeneous-source value of 0.5 in the power-law photon index. I describe the dependence on source gradients of the spectral break and other observables. I demonstrate that in these cases, inference of physical quantities such as the magnetic field strength using homogeneous-source formulae can lead to highly inaccurate results. For a "Kennel-Coroniti" MHD flow, application of homogeneous formulae can result in an overestimate of the magnetic field by almost an order of magnitude. I illustrate these properties using several well-studied PWNe. For B0540-693 in the Large Magellanic Cloud, the observed spectral break of -0.8 could be explained with a conical outflow incorporating mass loading (for instance, from evaporation of thermal filaments). In this model the mean source size should shrink as roughly the 1/3 power of frequency.
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