Extinction and Emission by Grains in the Diffuse ISM

Details Extinction and Emission by Grains in the Diffuse ISM Extinction and Emission by Grains in the Diffuse ISM

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30459m&link_type=abstract

Spitzer Proposal ID #30459

Physics

Scientific paper

We propose to obtain low resolution IRS short and long wavelength spectra of both stars and diffuse PAH emission in a carefully selected sample of stars. This sample is composed of stars with well determined UV extinction curves and which are shown to lie beyond all of the extincting and emitting dust along their lines of sight. The new observations are designed to provide IR extinction curves and high quality PAH emission spectra for the program sight lines. Our sample includes sight lines whose UV curve extinction curves exhibit a wide range of curve morphology and which sample a variety of interstellar environments. As a result, this unique sample will enable us to study the connection between the extinction and emission properties of the grains and to examine their response to different physical environments. We discuss how these results will provide clues to the composition of interstellar grains and facilitate the modeling of the grain populations along selected lines of sight.

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