Ices at the lowest temperatures: Spitzer IRS observations of Lynds 134N

Details Ices at the lowest temperatures: Spitzer IRS observations of Lynds 134N Ices at the lowest temperatures: Spitzer IRS observations of Lynds 134N

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40432w&link_type=abstract

Spitzer Proposal ID #40432

Computer Science

Scientific paper

Spitzer's Infrared Spectrograph is providing a vast library of spectra for young stellar objects (YSOs) of low and intermediate mass that remain embedded in placental material. Solid-state features of dust and ices are detected routinely in these spectra, prominent amongst them the carbon dioxide bending-mode absorption near 15 microns. This feature has strong diagnostic properties, with potential to yield insight into the chemical pathways that produce CO2 in different environments and the thermal evolution of the ices in the vicinity of young stars. However, to fully exploit this potential for interpretation of YSO spectra, it is essential to establish the nature of CO2-bearing ices in the coldest regions of molecular clouds, remote from shocks and radiation fields driven by embedded stars. This requires observation of ice features in the spectra of background field stars viewed through the dense material. Previous observations have provided a clear picture of the composition and structure of the ices in **one** dark cloud (Taurus), but it is not clear whether this cloud is prototypical: the only currently available comparison line of sight shows major differences. We propose the first detailed study of ices in L134N, a cold, chemically-rich, isolated globule that we believe to be an excellent test case of ambient conditions in the quiescent dark-cloud environment. Background stars are intrinsically faint in the mid-IR: the sensitivity and spectral coverage of Spitzer provide a unique opportunity to obtain high quality spectra for a significant sample of targets.

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