Very Small Particles and Chemistry in Photodissociation Regions

Details Very Small Particles and Chemistry in Photodissociation Regions Very Small Particles and Chemistry in Photodissociation Regions

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3512j&link_type=abstract

Spitzer Proposal ID #3512

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Scientific paper

The very small particles play a major role in the physics and chemistry of the interstellar medium, since they dominate the heating of interstellar gas through photoelectric effect and contribute to the formation of H2. Excited by single UV photons, their emission can be disentangled from other dust components only in faint regions with low excitation and with a high spatial resolution. We propose to use the unique spectro-imagery capabilities of the Spitzer Space Telescope to study the nature and the evolution of the very small particles together with the chemistry (H2 formation) across low excitation PDRs. Our sources are selected in order to span a broad range of physical conditions (radiation field, geometry and density). Low and high spectral resolution observations are conducted at positions precisely selected from ISO observations. Broad-band mapping in the four bands of IRACand MIPS at 24 microns complement the spectroscopic observations. The data will be interpreted in the frame of a PDR and a dust models, and the results tested with a laboratory set-up allowing to simulate the interstellar conditions. Finally our studies of local PDR will be very helpful to interpret data in external galaxies taken by other Spitzer programs.

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