Observations of the Cygnus Loop supernova remnant: dust processing in radiative and non-radiative shocks

Details Observations of the Cygnus Loop supernova remnant: dust processing in radiative and non-radiative shocks Observations of the Cygnus Loop supernova remnant: dust processing in radiative and non-radiative shocks

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20743s&link_type=abstract

Spitzer Proposal ID #20743

Computer Science

Scientific paper

We propose to address the important question of dust destruction in supernova remnant shocks by obtaining Spitzer IRS spectra and MIPS images of non-radiative and radiative shocks in the Cygnus Loop. Spectra will be obtained at various distances from a fast non-radiative shock front that is defined by a Balmer filament termed `P7'. The spectra will trace the evolution of the 5-35 micron continuum in the post-shock flow. This is the spectral region strongly affected by stochastic heating and destruction by sputtering of small grains. In the bright, radiative shock interaction region known as `XA', spectra will be obtained at locations known to be at different stages of recombination. The IRS spectral range includes several emission lines that are abundance diagnostics. We will study the release of refractory elements into the gas phase as grains are sputtered and destroyed by comparing key flux ratios at the different locations. MIPS images will reveal the infrared morphologies of both P7 and XA regions at unprecedented spatial resolution. By comparing these images with X-ray and optical images we will be able to clarify the relationship among the different emitting components.

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