Ice Chemistry in IC 5146 : A Follow-Up Study of Dense Cloud Dust

Details Ice Chemistry in IC 5146 : A Follow-Up Study of Dense Cloud Dust Ice Chemistry in IC 5146 : A Follow-Up Study of Dense Cloud Dust

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20129p&link_type=abstract

Spitzer Proposal ID #20129

Computer Science

Scientific paper

We propose higher S/N 5.3-14.2 micron IRS spectra of 6 of our Cycle 1 background field star targets which sample quiescent dust in the dense cloud IC 5146. This cloud has the best-understood dust distribution of the four clouds under study in our Cycle 1 proposal. Our Cycle 1 clouds range from a starless Bok Globule to clouds with a small degree of low mass star formation. IC 5146 is exceptionally well characterized making this an ideal testbed to study interstellar dust. Our Cycle 1 data for 12 sightlines reveals silicate features in all cases, and variations in the ice to silicate band ratios. Although well matched flux values can be achieved using the newly discovered extinction law for diffuse dust (Indebetouw et al. 2005), the laws previously thought to apply to dense clouds overestimated the 6 um flux. Thus, our Cycle 1 integration times (I.T.) were low for these sightlines. We request 5 hours I.T. on IRS to obtain higher S/N data for this very important cloud. Because the dust distribution is so well characterized in this cloud, these observations will allow us to probe the early stages of chemical processing of dense cloud dust to an unprecedented degree. This cloud is critical in the continuum of clouds we selected for Cycle 1. Positions and profiles of the 6.0 ?m and 6.8 ?m ice features in our IC 5146 lines of sight will allow us to identify the principal components of 'quiescent' cloud ices in the absence of stellar activity, and to assess how dense cloud materials evolve as they pass from the general cloud medium into star-formation regions.

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