Dust Destruction in a Nonradiative Shock in the Cygnus Loop Supernova Remnant

Details Dust Destruction in a Nonradiative Shock in the Cygnus Loop Supernova Remnant Dust Destruction in a Nonradiative Shock in the Cygnus Loop Supernova Remnant

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1183...95s&link_type=abstract

SHOCK WAVES IN SPACE AND ASTROPHYSICAL ENVIRONMENTS: 18th Annual International Astrophysics Conference. AIP Conference Proceedin

Astronomy and Astrophysics

Astrophysics

Supernova Remnants, Photometers, Interplanetary Matter, Shock Waves, Sputtering, X-Rays, Supernova Remnants, Photometric, Polarimetric, And Spectroscopic Instrumentation, Interplanetary Dust And Gas, Shock Waves And Discontinuities, Atomic, Molecular, And Ion Beam Impact And Interactions With Surfaces, X-Ray

Scientific paper

We present 24 μm and 70 μm images of a non-radiative shock in the Cygnus Loop supernova remnant, obtained with the Multiband Imaging Photometer on board the Spitzer Space Telescope. The observed emission is from dust grains heated in the post-shock region. The 70 μm to 24 μm flux ratio depends on the dust heating and the dust destruction rates, and thereby it is a sensitive tracer of the gas density and temperature in the shocked plasma. We model the dust emission and grain destruction in the post-shock flow, and find that the observed 70 μm to 24 μm flux ratios are produced for post-shock densities, nH~2.0 cm-3 and electron temperatures of about 0.20 keV. We find that about 35% of the dust has been destroyed in the shock, and that non-thermal sputtering (i.e. sputtering due to bulk motion of the grains relative to the gas) contributes significantly to the dust destruction.

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