Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.5904s&link_type=abstract
American Astronomical Society, 186th AAS Meeting, late abstracts, #59.04; Bulletin of the American Astronomical Society, Vol. 27
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The supernova remnant W44 and a handful of similar objects form a small, eccentric class with shell type radio emission and centrally peaked x-ray emission. W44 cannot be explained adequately with Sedov models, but has been modelled assuming that evaporating clouds in the center of the remnant increase the density and thus the x-ray emission. In this project, we consider a simpler scenario: that thermal conduction transports energy outwards from the very hot center. The central pressure matches that in the conduction-free Sedov model, while the central temperature is lower and the density higher. The appreciable central density provides a much higher x-ray emission. In addition, the large column density of intervening H I preferentially absorbs the lower frequency x-ray emission originating in the cooler, outer regions, eliminating the bright shell emission. We use a hydrodynamical simulation, from which we predict the 21 cm, radio synchtrotron (due to the van der Laan mechanism) and x-ray emisssion. Our preliminary results show good agreement with the observations. Thermal conduction appears to provide an alternative to cloud evaporation as a mechanism for supplying thermal x-ray emission in the central regions of supernova remnants.
Cox Donald P.
Shelton Robin L.
Smith Randall K.
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