Probing Dust Grains Emissions in High Latitude Molecular Clouds

Details Probing Dust Grains Emissions in High Latitude Molecular Clouds Probing Dust Grains Emissions in High Latitude Molecular Clouds

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40154g&link_type=abstract

Spitzer Proposal ID #40154

Physics

Scientific paper

We are proposing to image two high latitude molecular clouds (HLMCs) with IRAC and MIPS to probe the changes with environment in the size distributions of dust grains responsible for dust emissions in the optical, infrared, and radio. The IRAC and MIPS images will probe the thermal emission from small and large grains (MIPS 70 & 160 micron), non-equilibrium emission from very small grains (IRAC & MIPS 24 micron), and mid-infrared PAH emission (IRAC 3.6 & 8.0 micron). Existing and planned medium-band optical observations will probe optical luminescence emission (Blue Photoluminescence and Extended Red Emission). Planned radio observations at 30 GHz will probe emission from spinning very small grains and PAHs. The combination of these datasets will provide strong constraints on dust grain models, especially on the mechanisms and rates for the changes of the grain size distribution through coagulation and fragmentation that occur in regions of varying gas and radiation densities.

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