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The abundance of carbon dioxide ice in the quiescent intracloud medium

Authors
  • Dcb, Whittet
  • S S, Shenoy
  • E A, Bergin
  • Jean Chiar
  • P A, Gerakines
  • E L, Gibb
  • G J, Melnick
  • D A, Neufeld
Type
Published Article
Journal
The Astrophysical Journal
Publisher
American Astronomical Society
Publication Date
Jan 20, 2007
Volume
655
Issue
1
Pages
332–332
Source
SETI Institute
License
Unknown

Abstract

We present new observations with the Infrared Spectrograph on board the Spitzer Space Telescope of the solid-CO 2 absorption feature near 15 μm in the spectra of eight field stars behind the Taurus complex of dark clouds. Solid CO 2 is detected in six lines of sight. New results are combined with previous data to investigate the correlation of CO 2 column density with those of other major ice constituents (H 2 O and CO) and with extinction. CO 2 is shown to display a" threshold extinction" effect, ie, a minimum extinction (A 0= 4.3 ...

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