Simulations of Mixed Morphology Supernova Remnants With Anisotropic Thermal Conduction

Details Simulations of Mixed Morphology Supernova Remnants With Anisotropic Thermal Conduction Simulations of Mixed Morphology Supernova Remnants With Anisotropic Thermal Conduction

2006-04-21

arxiv.org/abs/astro-ph/0604474v1

Mon.Not.Roy.Astron.Soc.371:1106-1112,2006

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, submitted to Monthly Notices

Scientific paper

10.1111/j.1365-2966.2006.10747.x

We explore the role of anisotropic thermal conduction on the evolution of supernova remnants through interstellar media with a range of densities via numerical simulations. We find that a remnant expanding in a dense environment can produce centre-bright hard x-ray emission within 20 kyr, and centre-bright soft x-ray emission within 60 kyr of the supernova event. In a more tenuous environment, the appearance of a centre-bright structure in hard x-rays is delayed until about 60 kyr. The soft x-ray emission from such a remnant may not become centre bright during its observable lifetime. This can explain the observations that show that mixed-morphology supernova remnants preferentially occur close to denser, molecular environments. Remnants expanding into denser environments tend to be smaller, making it easier for thermal conduction to make larger changes in the temperatures of their hot gas bubbles. We show that the lower temperatures make it very favorable to use high-stage ions as diagnostics of the hot gas bubbles in SNRs. In particular, the distribution of O VIII transitions from shell-bright at early epochs to centre-bright at later epochs in the evolution of an SNR expanding in a dense ISM when the physics of thermal conduction is included.

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