Measuring the Veil: The Galactic Extinction From 3 to 30 Microns - The Dense AND Diffuse ISM -

Details Measuring the Veil: The Galactic Extinction From 3 to 30 Microns - The Dense AND Diffuse ISM - Measuring the Veil: The Galactic Extinction From 3 to 30 Microns - The Dense AND Diffuse ISM -

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20294d&link_type=abstract

Spitzer Proposal ID #20294

Computer Science

Scientific paper

Although the Galactic infrared extinction curve is quite uncertain at wavelengths longer than 2 micron, the infrared extinction is critical to the interpretation of infrared observations. Here we propose to measure the 3--30 micron extinction curve on 4 lines of sight towards background stars with a range of visual extinction between 13 and 70 mag. These high extinctions are required to allow a precise measurement at infrared wavelengths where extinction is much less. We will use the traditional (in the optical) method of ratioing the Spitzer IRS low resolution spectra of extinguished and unextinguished stars. Our extinguished sources have been chosen to be free of photospheric spectral features and most importantly (for the infrared) free of circumstellar dust emission. We take the additional step of observing a range of calibrator spectral types to account for the unlikely possibility that a Rayleigh-Jeans treatment would be inadequate. Our sight line selection will allow us to measure separately extinction due to dust and/or ice in both dense and diffuse ISM environments and will provide for the first time a truly reliable measure of the ratio of the strengths of the ten and twenty silicate silicate features in these distinct environments. 5.3 hours is requested to complete these observations.

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