Linear Analysis of Infrared CO Spectra Takeshi Oka Department of Astronomy and Astrophysics and Department of Chemistry, The Enrico Fermi Institute, University of Chicago Han Xiao Department of Statistics, University of Chicago Tom Geballe Gemini Observatory Chris Morong Department of Chemistry, University of Chicago June 24, Columbus Symposium Tomoharu Oka, Keio University
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Linear Analysis of Infrared CO Spectra Takeshi Oka Department of Astronomy and Astrophysics and Department of Chemistry, The Enrico Fermi Institute, University.
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Linear Analysis of Infrared CO Spectra
Takeshi OkaDepartment of Astronomy and Astrophysics
and Department of Chemistry, The Enrico Fermi Institute, University of Chicago
Han XiaoDepartment of Statistics, University of Chicago
Tom GeballeGemini Observatory
Chris MorongDepartment of Chemistry, University of Chicago
June 24, Columbus Symposium
Tomoharu Oka, Keio University
H3+ and CO are complementary
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n(X
)
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n(H)
Dense Clouds Diffuse Clouds
H2
HCO
C+H3
+
n(CO) nH N(C) → M
n(H3+) nH
0 N(H3+) → L· ζ
CO high n low T J = 0, 1, 2, 3
H3+ low n high T (3,3), (2,2)
N(CO) ~ 1018-19 cm-2 v = 2←0 μ2-0 = 0.00651 Debye
N(H3+) ~ 1015-16 cm-2 v = 1←0 μ1-0 = 0.158 Debye
H3+ and CO Discriminate Clouds
Oka et al. ApJ 632, 882 (2005) Geballe & Oka ApJ 709, L70 (2010)