Connecting the Extinction Curve from the UV to the Spitzer Infrared

Details Connecting the Extinction Curve from the UV to the Spitzer Infrared Connecting the Extinction Curve from the UV to the Spitzer Infrared

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50043m&link_type=abstract

Spitzer Proposal ID #50043

Computer Science

Scientific paper

We propose to observe a sample of hot, reddened stars to measure the wavelength dependence of interstellar extinction from 3-24 um along lines of sight probing the dense, high optical depth environments of interstellar clouds. We will use IRAC (3-8 um), IRS (low resolution, 5-21 um), IRS-PUI (15 um), and MIPS (24 um) to measure the infrared extinction curve for a sample of stars with A(V) up to ~7.5. With the installation of the Cosmic Origins Spectrograph (COS) on HST, UV observations with high S/N towards high A(V) lines of sight will possible for the first time. Spitzer provides the first opportunity to observe silicate features in the infrared along sightlines with UV extinction curves. The complementarity of the two instruments represents an unprecedented opportunity to measure extinction curves from the UV through the IR along such high optical depth lines of sight. The availability of extinction curves covering the full wavelength range from the UV through IR supplied by this program will provide a unique probe the effects of environment on grain formation, growth, and destruction. Additionally, the accurate measurement of the IR extinction curve along dense sight lines will provide insight into the nature of interstellar dust as a function of environment, both from prominent solid state features (e.g. 10/18 um silicate) and the shape of the continuum extinction.

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