Abstract
The near infrared vibration rotation (v-r) bands of CO and H2 provide a powerful tool for the study of physical conditions in molecular clouds. They cluster individual v-r transitions, encompassing a wide range of excitation energy and line strength, into a relatively narrow frequency interval which can be observed with uniform instrumental techniques, often with a single instrument. Precise line frequencies and transition probabilities are available for both CO and H2. The v-r lines are not seen in emission from cool (T ≲ 200K) cloud material because their upper states (E/k ≳ 3000K) are not collisionally populated at such temperatures. However, the H2 transitions are emitted by shocked regions where T is ≳ 2000K and the CO transitions are seen in absorption against embedded continuum sources.
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References
Beck, S.C., Lacy, J.H., and Geballe, T.R. 1979, Ap. J. (Letters), 234, L213.
Beckwith, S., Persson, S.E., and Neugebauer, G. 1979, Ap. J., 227, 436.
Beckwith, S., Persson, S.E., Neugebauer, G., and Becklin, E.E. 1978, Ap. J., 223, 464.
Beckwith, S., Evans, N.J., III, Gatley, I., Gull, G., and Russell, R.W. 1983, Ap. J., 264, 152.
Bragg, S.L., Brault, J.W., and Smith, W.H. 1982, Ap. J., 263, 999.
Davis, D.S., Larson, H.P., and Smith, H.A. 1982, Ap. J. 259, 85.
Fink, U., Wiggins, T.A., and Rank, D.H. 1965, J. Molec. Spectrosc., 18, 384.
Gautier, T.N., III, Fink, U., Treffers, R.R., and Larson, H.P. 1976, Ap. J. (Letters), 207, L129.
Hall, D.N.B., Kleinmann, S.G., Ridgway, S.T., and Gillett, F. 1978, Ap. J. (Letters), 223, L47.
Herzberg, G. 1950, “Spectra of Diatomic Molecules” (Princeton: Van Nostrand).
Johnson, H.L. 1968, in “Stars and Stellar Systems, Vol 7, Nebulae and Interstellar Matter” ed B.M. Middlehurst and L.H. Allen (Chicago, University of Chicago Press), p 167.
Kirby-Docken, K. and Liu, B. 1978, Ap. J. Suppl., 36, 359.
Knacke, R.F. and Young, E.T. 1981, Ap. J. (Letters), 249, L65.
Mantz, A.W., Maillard, J.P., Roh, W.B., and Rao, K.N. 1975, J. Molec. Spectrosc., 57, 155.
Nadeau, D., and Geballe, T.R. 1979, Ap. J. (Letters), 230, L169.
Nadeau, D., Geballe, T.R., and Neugebauer, G. 1982, Ap. J., 253, 154.
Scoville, N.Z., Hall, D.N.B., Kleinmann, S.G., and Ridgway, S.T. 1982, Ap. J., 253, 136.
Scoville, N.Z., Kleinmann, S.G., Hall, D.N.B., and Ridgway, S.T. “The Circumstellar and Nebular Environment of the Becklin-Neugebauer Object: λ = 2–5 Micron Spectroscopy” Ap. J., Submitted.
Shull, J.M., and Beckwith, S. 1982, Ann. Rev. Astron. Astrophys., 20, 163.
Simon, M., Righini-Cohen, G., Joyce, R.R., and Simon, T. 1979, Ap J. (Letters), 230, L175.
Turner, J., Kirby-Docken, K., and Dalgarno, A. 1977, Ap. J. Suppl., 35, 381.
Tipping, R.H. 1976, J. Molec. Spectrosc., 631, 272.
Young, L.A., and Eachus, W.J. 1966, J. Chem. Phys., 44, 4195.
Zuckerman, B., and Palmer, P. 1975, Ap. J. (Letters), 199, L35.
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Hall, D.N.B. (1984). Near-IR Spectroscopy of H2 and CO in Molecular Clouds. In: Kessler, M.F., Phillips, J.P. (eds) Galactic and Extragalactic Infrared Spectroscopy. Astrophysics and Space Science Library, vol 108. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7251-3_17
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DOI: https://doi.org/10.1007/978-94-009-7251-3_17
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