Very Small Grains and the mid-IR continuum emission from (ultra)compact HII regions

Details Very Small Grains and the mid-IR continuum emission from (ultra)compact HII regions Very Small Grains and the mid-IR continuum emission from (ultra)compact HII regions

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20517p&link_type=abstract

Spitzer Proposal ID #20517

Computer Science

Scientific paper

Over the last decade, much effort has been expended on characterizing and understanding the well-known mid-IR emission features at 3.3, 6.2, 7.7, and 11.2 um, generally attributed to Polycyclic Aromatic Hydrocarbon molecules. However, the spectra of many sources also show a weak underlying mid-IR continuum. The origin of this continuum, which varies independently from these IR features, is less clear but, is often attributed to emission by very small dust particles (VSGs, ~20 A). These VSGs are a very important component of the interstellar dust. However, the weakness of the mid-IR continuum and the limited sensitivity of IR detectors has up to now seriously hampered detailed observational investigations of the carriers of this continuum. Hence, the characteristics of these VSGs are presently ill-constrained. We propose to use the ultimate sensitivity of the IRS on Spitzer to study the mid-IR continuum emission in a sample of (ultra)-compact HII regions which span a wide range in the strength of the FUV field and density. The proposed observations will provide a direct handle on the abundance and the heating agent of their carriers and their interrelationship to the IR emission features.

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