Hostname: page-component-78c5997874-xbtfd Total loading time: 0 Render date: 2024-11-08T08:38:31.258Z Has data issue: false hasContentIssue false
  • English
  • Français

Oh as a Constituent of the Interstellar Medium

Published online by Cambridge University Press:  30 March 2016

B. E. Turner

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

OH is at present the most ubiquitous molecule known in the interstellar medium. It is primarily associated with galactic continuum sources, both thermal and nonthermal. The fraction of all sources showing OH decreases monotonically with galactic longitude away from the Galactic Center region. However, neither the projected density of OH nor the abundance relative to hydrogen or other molecules seems to depend on location within the galactic plane. OH also occurs in many dark dust clouds, where its density is typically 10−5—10−4 cm−3 and its abundance relative to hydrogen is very high. OH is not found in the heavily reddened stellar clusters of Reddish, in Wolf Rayet stars, in planetary nebulae, or in globules. Recent surveys have indicated that OH both in emission and in absorption, is highly correlated with H2CO in direction and in velocity. OH emission, but not absorption, is also highly correlated with anomalous H2O emission. These relationships are important in deciding between various processes for interstellar molecule formation. On present information, it appears that more than one such process is operative in different regions of the interstellar medium.

Type
III. Joint Discussions
Information
Highlights of Astronomy , Volume 2: Highlights of Astronomy. As presented at the XIVth General Assembly of the IAU, 1970 , 1971 , pp. 378 - 390
Copyright
Copyright © Reidel 1971

References

Altenhoff, W. J., Downes, D., Goad, L., Maxwell, A., and Rinehart, R.: 1970, Astron. Astrophys., Suppl. Series 1, 319.Google Scholar
Bates, D. R. and Spitzer, L. Jr.,: 1951, Astrophys. J. 113, 441.CrossRefGoogle Scholar
Carroll, T. O. and Salpeter, E. E.: 1966, Astrophys. J. 143, 609.CrossRefGoogle Scholar
Carruthers, G. R.: 1970, Astrophys. J. Letters, in press.Google Scholar
Clark, B. G.: 1965, Astrophys. J. 142, 1398.CrossRefGoogle Scholar
Davies, R. D.: 1969, private communication.Google Scholar
Goss, W. M.: 1968, Astrophys. J. Suppl. 15, 131.CrossRefGoogle Scholar
Goss, W. M., Manchester, R. N., and Robinson, B. J.: 1970, Australian J. Phys., in press.Google Scholar
Gwinn, W. D., Millikan, R., Goss, W. M., and Turner, B. E.: 1968, unpublished.Google Scholar
Heiles, C. E.: 1968, Astrophys. J. 151, 919.CrossRefGoogle Scholar
Heiles, C. E.: 1969, Astrophys. J. 157, 123.CrossRefGoogle Scholar
Herbig, G. H.: 1968, Z. Astrophys. 68, 243.Google Scholar
Herbig, G. H.: 1970, Paper presented at 132nd Meeting of the American Astronomical Society, Boulder, Colo.Google Scholar
Litvak, M. M.: 1969, Astrophys. J. 156, 471.CrossRefGoogle Scholar
Manchester, R. N. and Gordon, M. A.: 1970, private communication.Google Scholar
Manchester, R. N., Robinson, B. J., and Goss, W. M.: 1970, Australian J. Phys., in press.Google Scholar
McNally, D.: 1968, in Advances in Astronomy and Astrophysics, Vol. 6 (ed. by Kopal, Z.) Academic Press, New York, London.Google Scholar
Mezger, P. G. and Henderson, A. P.: 1967, Astrophys. J. 147, 471.CrossRefGoogle Scholar
Miley, G. K., Turner, B. E., Balick, B., and Heiles, C. E.: 1970, Astrophys. J. Letters 160, L119.CrossRefGoogle Scholar
Reddish, V. C.: 1967, Monthly Notices Roy. Astron. Soc. 135, 251.CrossRefGoogle Scholar
Robinson, B. J., Gardner, F. F., von Damme, K. J., and Bolton, J. G.: 1964, Nature 202, 989.CrossRefGoogle Scholar
Robinson, B. J., Goss, W. M., and Manchester, R. N.: 1970, Australian J. Phys., 23, 363.Google Scholar
Sharpless, S.: 1959, Astrophys. J. Suppl. 4, 257.CrossRefGoogle Scholar
Snyder, L. E. and Buhl, D.: 1970, in preparation.Google Scholar
Solomon, P. M. and Klemperer, W.: 1970, Paper presented at 132nd Meeting of the American Astronomical Society, Boulder, Colo.Google Scholar
Stecher, T. P. and Williams, D. A.: 1966, Astrophys. J. 146, 88.CrossRefGoogle Scholar
Turner, B. E.: 1969a, Astrophys. J. 157, 103.CrossRefGoogle Scholar
Turner, B. E.: 1969b, Astron. J. 74, 985.CrossRefGoogle Scholar
Turner, B. E.: 1970, Astrophys. Letters (August issue).Google Scholar
Turner, B. E. and Heiles, C. E.: 1970, Paper presented at XIVth General Assembly, IAU, Brighton, England.Google Scholar
Turner, B. E., Balick, B., Cudaback, D. D., and Heiles, C. E.: 1970, in preparation.Google Scholar
Webster, W. J. and Altenhoff, W. J.: 1970, Astrophys. Letters 5, 233.Google Scholar
Weinreb, S., Barrett, A. H., Meeks, M. L., and Henry, J. C.: 1963, Nature 200, 829.CrossRefGoogle Scholar
Wilson, R. W., Jefferts, K. B., and Penzias, A. A.: 1970, Astrophys. J. Letters 161, L43.CrossRefGoogle Scholar
Wilson, T. L.: 1970, in preparation.Google Scholar
Zuckerman, B. M., Buhl, D., Palmer, P., and Snyder, L. E.: 1970, Astrophys. J. 160, 485.CrossRefGoogle Scholar