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Interstellar clouds containing optically thin H2
Abstract
The theory of Black and Delgarno that the relative populations of the excited rotational levels of H2 can be understood in terms of cascading following absorption in the Lyman and Werner bands is employed to infer the gas densities and radiation fields within diffuse interstellar clouds containing H2 that is optically thin in those bands. The procedure is described for computing the populations of the different rotation levels, the relative distribution among the different rotation levels of newly formed H2 is determined on the basis of five simplified models, and the rate of H2 formation is estimated. The results are applied to delta Ori, two components of iota Ori, the second components of rho Leo and zeta Ori, tau Sco, gamma Vel, and zeta Pup. The inferred parameters are summarized for each cloud.
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Citations
Cited by
Photodissociation regions in the interstellar medium of galaxies
Hollenbach, D. J., & Tielens, A. G. G. M. (1999) · Reviews of Modern Physics · doi:10.1103/revmodphys.71.173 · Cited by 801
Diffuse Atomic and Molecular Clouds
Snow, T. P., & McCall, B. J. (2006) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.43.072103.150624 · Cited by 584
Rapid Formation of Molecular Clouds and Stars in the Solar Neighborhood
Hartmann, L., Ballesteros‐Paredes, J., & Bergin, E. A. (2001) · The Astrophysical Journal · doi:10.1086/323863 · Cited by 567
Krumholz, M. R. (2014) · Physics Reports · doi:10.1016/j.physrep.2014.02.001 · Cited by 321
Wakelam, V., Bron, E., Cazaux, S., Dulieu, F., Gry, C., Guillard, P., Habart, E., Hornekær, L., Morisset, S., Nyman, G., et al. (2017) · Molecular Astrophysics · doi:10.1016/j.molap.2017.11.001 · Cited by 267
Metadata
- Authors
- Jura, M.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1975-05
- Volume
- 197
- Pages
- 575
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2249042401
- Cited by
- 192
- References
- 0
- FWCI
- 4.51
- Type
- journal article
- Language
- en
- Open access
- closed
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- Jura, M. (1975). Interstellar clouds containing optically thin H2. The Astrophysical Journal. https://doi.org/10.1086/153545
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