Dust Destruction in a Non-radiative Shock in the Cygnus Loop Supernova Remnant

Details Dust Destruction in a Non-radiative Shock in the Cygnus Loop Supernova Remnant Dust Destruction in a Non-radiative Shock in the Cygnus Loop Supernova Remnant

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...712.1092s&link_type=abstract

The Astrophysical Journal, Volume 712, Issue 2, pp. 1092-1099 (2010).

Astronomy and Astrophysics

Astronomy

4

Dust, Extinction, Ism: Individual Objects: Cygnus Loop, Ism: Supernova Remnants, Shock Waves

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 for Spitzer on board the Spitzer Space Telescope. The post-shock region is resolved in these images. The ratio of the 70 μm to the 24 μm flux rises from about 14 at a distance 0farcm1 behind the shock front to about 22 in a zone 0farcm75 further downstream, as grains are destroyed in the hot plasma. Models of dust emission and destruction using post-shock electron temperatures between 0.15 keV and 0.30 keV and post-shock densities, n H~ 2.0 cm-3, predict flux ratios that match the observations. Non-thermal sputtering (i.e., sputtering due to bulk motion of the grains relative to the gas) contributes significantly to the dust destruction under these shock conditions. From the model calculations, we infer that about 35% by mass of the grains are destroyed over a 0.14 pc region behind the shock front.
Based on observations made with the Spitzer Space Telescope.

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