Interstellar Molecular Excitation

1
Interstellar Molecular Excitation

• Jan 25, 2008
• Kwok Chapters 7-9
• Palla Stahler Chapters 5 6

2
Rotational Transitions
3
Rotational Transitions
4
Rotational Transitions
5
Taurus Molecular Cloud in 12CO
(Goldsmith et al.)
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Taurus Molecular Cloud in 13CO
(Goldsmith et al.)
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Taurus Molecular Cloud in AV
(Dobashi et al. 2005)
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Temperature Measured by CO
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Temperature Measured by CO
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Column Density Measured by CO
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Column Density Measured by CO
12
Column Density Measured by CO
13
Column Density Measured by CO
14
Isotopologues of CO
(Frerking, Langer and Wilson, 1982)
Spectra taken in Taurus molecular cloud in a
region with AV 13.3
15
Vibrational Transitions of Diatomic Molecules
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Vibrational Transitions of Diatomic Molecules
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Vibrational Bands of CO
(Goto et al. 2003)
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H2
19
H2
20
Vibrational Lines of H2
(Rosenthal et al. 2000)
21
Hyperfine Lines in Molecules
22
N2H Spectrum
(Caselli, Myers Thaddeus, 1995)
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N2H Spectrum
(Schnee Goodman, 2005)
Infall
vinf 0.1 km/s
Antenna Temperature (K)
Velocity (km/s)
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N2H Infall
(Schnee et al. 2007b)
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Symmetric Tops
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Symmetric Tops
(N.B., these equations in Kwok (7.19) are in
error)
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Symmetric Tops
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Symmetric Tops - NH3
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TMC-1C NH3 Spectrum - GBT
(Schnee et al. in prep.)
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NH3 Velocity Map - GBT
(Schnee et al. in prep.)
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NH3 Optical Depth Map - GBT
(Schnee et al. in prep.)
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Asymmetric Tops
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Asymmetric Tops - H2O
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Asymmetric Tops - H2O
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Asymmetric Tops - H2O
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Schematic of a Maser
N3
h?23
N2
h?12
N1
37
Energy Levels for Ortho H2O
(Babkovskaia Poutanen 2004)
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Energy Levels for Ortho H2O
Energy (K)
(Neufeld Melnick 2001)
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NGC 4258
(Herrnstein et al. 1999)