Very Small Particles in Photodissociation Regions : further insights with MIPS SED

Details Very Small Particles in Photodissociation Regions : further insights with MIPS SED Very Small Particles in Photodissociation Regions : further insights with MIPS SED

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20281j&link_type=abstract

Spitzer Proposal ID #20281

Computer Science

Scientific paper

The goal of this proposal is to complement our successful Spitzer cycle 1 program ''SPECPDR'' dedicated to the study (with IRS, IRAC and MIPS) of the nature and evolution of very small dust particles (very small grains and PAHs) and the chemistry in PDRs. Now available for the first time, the MIPS-SED mode is well suited to study the emission of the big grains in thermal equilibrium with the radiation field in PDRs. Combining the spectro-imagery IRS and MIPS-SED observations, it will be possible to follow the spatial evolution of the abundance and size distribution of the different dust populations. Moreover, the combination of the important gas cooling line of [OI] at 63 micron with the dust emission will allow us to constrain the photoelectric efficiency. It will also probe the impact on the gas thermal balance of abundance variations of the very small dust particles. These data will be a benchmark for models describing the nature and evolution of all dust populations as well as for the excitation and formation of H2.

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