Spitzer Spectral Mapping Observations of Interstellar H2O and CO2 Ices

Details Spitzer Spectral Mapping Observations of Interstellar H2O and CO2 Ices Spitzer Spectral Mapping Observations of Interstellar H2O and CO2 Ices

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21531907s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #319.07; Bulletin of the American Astronomical Society, Vol. 42, p.321

Astronomy and Astrophysics

Astronomy

Scientific paper

Interstellar grains have been shown to coat themselves with icy mantles once the visual extinction exceeds about 3 magnitudes within a cloud. The existence of these mantles is revealed by the presence of absorption bands detected in the near- and mid- infrared wavelength ranges. The strongest of these bands are due to vibrational modes of water ice (3.1 and 6.0 microns), CO ice (4.7 microns), and CO2 ice (4.2 and 15.2 microns). Most of what has been learned about the formation and evolution of these ice mantles has come through studies against point-like background sources. Because such background sources are neither numerous nor contiguous, our knowledge of the onset of mantle formation and ice mantle evolution in space is based on a relatively small number of observed sight lines. The spectral mapping capability of the Spitzer Space Telescope allows the generation of contiguous and extended maps of both water ice and CO2, hence increasing the number of detections by orders of magnitude. Such fully sampled maps offer the unique opportunity to compare the ices distribution with the distribution of tracers of local physical conditions (e.g., H2, PAHs) in order to better understand the formation/evolution of ice mantles in the ISM. In the present paper, we discuss new observations of water ice and CO2 ice that we obtained toward the star-forming region NGC7538 IRS9 using the spectral mapping capability of Spitzer.
P.S. acknowledges support from NASA Spitzer grant under RSA agreement 1314055.

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