The DOI matches its Crossref record; 65 of the 65 references it cites were found in a registry or an index.
Diffuse Atomic and Molecular Clouds
Abstract
Diffuse interstellar clouds have long been thought to be relatively devoid of molecules, because of their low densities and high radiation fields. However, in the past ten years or so, a plethora of polyatomic molecules have been observed in diffuse clouds, via their rotational, vibrational, and electronic transitions. In this review, we propose a new systematic classification method for the different types of interstellar clouds: diffuse atomic, diffuse molecular, translucent, and dense. We review the observations of molecules (both diatomic and polyatomic) in diffuse clouds and discuss how molecules can be utilized as indicators of the physical and chemical conditions within these clouds. We review the progress made in the modeling of the chemistry in these clouds, and the (significant) challenges that remain in this endeavor. We also review the evidence for the existence of very large molecules in diffuse clouds, and discuss a few specific clouds of particular interest.
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Cites
The relationship between infrared, optical, and ultraviolet extinction
Cardelli, J. A., Clayton, G. C., & Mathis, J. S. (1989) · The Astrophysical Journal · doi:10.1086/167900 · Cited by 11,795
A Measurement of Excess Antenna Temperature at 4080 Mc/s.
Penzias, A. A., & Wilson, R. W. (1965) · The Astrophysical Journal · doi:10.1086/148307 · Cited by 2,604
A survey of interstellar H I from L-alpha absorption measurements. II
Bohlin, R. C., Savage, B. D., & Drake, J. F. (1978) · The Astrophysical Journal · doi:10.1086/156357 · Cited by 2,540
Draine, B. T. (2003) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.41.011802.094840 · Cited by 2,389
Physical Processes in the Interstellar Medium
Spitzer, L. (1998) · Wiley eBooks · doi:10.1002/9783527617722 · Cited by 2,090
McKee, C. F., & Ostriker, J. P. (1977) · The Astrophysical Journal · doi:10.1086/155667 · Cited by 2,082 · cited 1×
“Early models (e.g., McKee & Ostriker 1977) classified the ISM into three phases: the Cold Neutral Medium (CNM), often referred to as clouds; the Warm Ionized Medium or Warm Neutral Medium (WIM or WNM), which is sometimes considered the boundary layers of the CNM; and the Hot Ionized Medium (HIM),…”
BackgroundAllamandola, L. J., Tielens, G. G. M., & Barker, J. R. (1989) · The Astrophysical Journal Supplement Series · doi:10.1086/191396 · Cited by 1,391
INTERSTELLAR ABUNDANCES FROM ABSORPTION-LINE OBSERVATIONS WITH THE HUBBLE SPACE TELESCOPE
Savage, B. D., & Sembach, K. R. (1996) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.34.1.279 · Cited by 1,231
Draine, B. T. (2003) · CERN Document Server (European Organization for Nuclear Research) · Cited by 1,230
Neutral Atomic Phases of the Interstellar Medium in the Galaxy
Wolfire, M. G., McKee, C. F., Hollenbach, D., & Tielens, A. G. G. M. (2003) · The Astrophysical Journal · doi:10.1086/368016 · Cited by 1,125
Cited by
Complex Organic Interstellar Molecules
Herbst, E., & van Dishoeck, E. F. (2009) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-082708-101654 · Cited by 1,759
Photochemistry and Astrochemistry: Photochemical Pathways to Interstellar Complex Organic Molecules
Öberg, K. I. (2016) · Chemical Reviews · doi:10.1021/acs.chemrev.5b00694 · Cited by 474
The Nine Lives of Cosmic Rays in Galaxies
Grenier, I. A., Black, J. H., & Strong, A. W. (2015) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-082214-122457 · Cited by 320
Sheffer, Y., Rogers, M., Federman, S. R., Abel, N. P., Gredel, R., Lambert, D. L., & Shaw, G. (2008) · The Astrophysical Journal · doi:10.1086/591484 · Cited by 280
Tomza, M., Jachymski, K., Gerritsma, R., Negretti, A., Calarco, T., Idziaszek, Z., & Julienne, P. S. (2019) · Reviews of Modern Physics · doi:10.1103/revmodphys.91.035001 · Cited by 267
Metadata
- Authors
- Snow, T. P., & McCall, B. J.
- Venue
- Annual Review of Astronomy and Astrophysics
- Publisher
- Annual Reviews
- Published
- 2006-09-01
- Volume
- 44
- Issue
- 1
- Pages
- 367-414
- ISSN
- 0066-4146 (ISSN-L)
- 1545-4282
- OpenAlex
- W2026096786
- Cited by
- 584
- References
- 65
- FWCI
- 2.56
- Type
- journal article
- Language
- en
- Open access
- closed
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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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