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The Relationship between the Optical Depth of the 9.7 μm Silicate Absorption Feature and Infrared Differential Extinction in Dense Clouds

Authors
  • Jean Chiar
  • K, Ennico
  • Y J, Pendleton
  • Aca, Boogert
  • T, Greene
  • C, Knez
  • C, Lada
  • T, Roellig
  • Aggm, Tielens
  • M, Werner
  • Dcb, Whittet
Type
Published Article
Journal
The Astrophysical Journal Letters
Publication Date
Aug 19, 2007
Volume
666
Issue
2
Pages
73–73
Source
SETI Institute
License
Unknown

Abstract

We have examined the relationship between the optical depth of the 9.7 μm silicate absorption feature (τ 9.7) and the near-infrared color excess, E (JK s), in the Serpens, Taurus, IC 5146, Chameleon I, Barnard 59, and Barnard 68 dense clouds/cores. Our data set, based largely on Spitzer IRS spectra, spans E (JK s)= 0.3-10 mag (corresponding to visual extinction between about 2 and 60 mag). All lines of sight show the 9.7 μm silicate feature. Unlike in the diffuse ISM where a tight linear correlation between the 9.7 μm ...

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