Mapping ices in a dense cloud toward background stars: Tracers of solid state chemistry at high spatial resolution

Details Mapping ices in a dense cloud toward background stars: Tracers of solid state chemistry at high spatial resolution Mapping ices in a dense cloud toward background stars: Tracers of solid state chemistry at high spatial resolution

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3336d&link_type=abstract

Spitzer Proposal ID #3336

Physics

Scientific paper

We propose to obtain spatially well resolved maps of ice abundances in two isolated dark cloud cores using absorption spectroscopy. The large wavelength coverage together with the unpredented sensitivity of Spitzer-IRS will allow us to obtain absorption spectra of many different ice species toward faint background stars. We will thereby map the detailed ice abundance structure of the clouds in molecules such as H2O, CO2, CH3OH, CH4 and NH3. This unique approach will make it possible to address the onset of formation of each individual ice species as a function of local physical conditions such as density, extinction and temperature. Of special interest is to constrain the chemical interrelation between the ice constituents. We propose to map ice abundances in the starless Coalsack cloud core and in the isolated core L723, which contains a deeply embedded protostar. Spitzer-IRS is able to record the spectra of background sources with a spatial density of better than one source per square arcminute, which is two orders of magnitude higher than previously attained. This density of lines of sight is sufficient to adequately sample a typical 5'x5' dark cloud.

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