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THE IMPLICATIONS OF MOLECULAR HYDROGEN EMISSION

Published online by Cambridge University Press:  14 August 2015

Steven Beckwith
Steven Beckwith*
Affiliation:
Department of Astronomy, Cornell University, Ithaca, N.Y., U.S.A.

Abstract

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Emission from vibrationally excited molecular hydrogen has been discovered in a variety of objects of widely differing ages and environs including molecular clouds, planetary nebulae, and a Seyfert galaxy. The observations of the H2 spectra indicate this emission arises in hot, nearly thermalized gas. While there is still some disagreement between detailed predictions of hydrodynamic calculations and recent observations, it is generally believed that energy supplied to the interstellar gas in the form of shock waves is responsible for the observed H2 emission.

Several of the H2 sources are molecular clouds associated with ongoing star formation, most notably the Orion Molecular Cloud. From the intensity, strength, temperature, and velocity of the molecular hydrogen emission, it is estimated that at least 1048 ergs has been deposited in the cloud over the last thousand years or so in the form of bulk kinetic energy. There is no clear explanation for this process, since the energy is large and the timescale short, and it appears unlikely that we should observe such events unless they occur frequently. Among the other H2 sources in molecular clouds, NGC 7538, DR 21, and W3 are of similar spatial extent and apparent luminosity as the Orion emission.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 96: Infrared Astronomy , 1981 , pp. 167 - 178
Copyright
Copyright © Reidel 1981 

References

Beck, S. C., Lacy, J. H., and Geballe, T. R.: 1979, Ap. J. (Letters) 234, L213.CrossRefGoogle Scholar
Beck, S. C., Serabyn, E., Lacy, J. H., Geballe, T. R., and Smith, H. A.: 1980, paper presented at IAU Symposium #96 on Infrared Astronomy.Google Scholar
Beckwith, S.: 1979, IAU Symposium #87 on Interstellar Molecules.CrossRefGoogle Scholar
Beckwith, S. and DeNoyer, L. K.: 1981, in preparation.Google Scholar
Beckwith, S., Gatley, I., Matthews, K., and Neugebauer, G.: 1978a, Ap. J. (Letters) 223, L41.CrossRefGoogle Scholar
Beckwith, S., Persson, S. E., and Gatley, I.: 1978, Ap. J. (Letters) 219, L33.CrossRefGoogle Scholar
Beckwith, S., Persson, S. E., and Neugebauer, G.: 1979, Ap. J. 227, p. 436.CrossRefGoogle Scholar
Beckwith, S., Persson, S. E., Neugebauer, G., and Becklin, E. E.: 1978b, Ap. J. 223, p. 464.CrossRefGoogle Scholar
Beckwith, S., Persson, S. E., Neugebauer, G., and Becklin, E. E.: 1980, Astron. J., in press.Google Scholar
Black, J. H.: 1978, Ap. J. 222, p. 125.CrossRefGoogle Scholar
Capriotti, E. R.: 1973, Ap. J. 179, p. 495.CrossRefGoogle Scholar
Chevalier, R. A.: 1980, preprint.Google Scholar
Dalgarno, A. and Roberge, W. G.: 1979, Ap. J. (Letters) 233, L25.CrossRefGoogle Scholar
DeNoyer, L. K.: 1979a, Ap. J. (Letters) 228, L41.CrossRefGoogle Scholar
DeNoyer, L. K.: 1979b, Ap. J. (Letters) 232, L165.CrossRefGoogle Scholar
Draine, B. T., Roberge, W., and Dalgarno, A.: 1979, Bull. ASS 11, p. 689.Google Scholar
Drapatz, S. and Michel, K. W.: 1974, Astron. and Astrophys. 36, p. 211.Google Scholar
Elias, J. H.: 1980, preprint.Google Scholar
Fischer, J., Righini-Cohen, G., and Simon, M.: 1980, Ap. J. (Letters) 238, L155.CrossRefGoogle Scholar
Fischer, J., Righini-Cohen, G., Simon, M., Joyce, R. R., and Simon, T.: 1980, preprint.Google Scholar
Gautier, T. N. III: 1978, , University of Arizona.Google Scholar
Gautier, T. N. III, Fink, U., Treffers, R. R., and Larson, H. P.: 1976, Ap. J. (Letters) 207, L129.CrossRefGoogle Scholar
Genzel, R. and Downes, D.: 1977, Astron. Astrophys. 61, p. 117.Google Scholar
Genzel, R., Reid, M. J., Moran, J. M., and Downes, D.: 1980, preprint.Google Scholar
Grasdalen, G. L. and Joyce, R. R.: 1976, Bull. AAS 8, p. 349.Google Scholar
Hollenbach, D. J.: 1979, IAU Symposium #87 on Interstellar Molecules.Google Scholar
Hollenbach, D. J. and McKee, C.: 1979, Ap. J. Supp. 41, p. 555.CrossRefGoogle Scholar
Hollenbach, D. H., and Shull, J. M.: 1977, Ap. J. 216, p. 419.CrossRefGoogle Scholar
Kuhi, L. V.: 1964, Ap. J. 140, p. 1409.CrossRefGoogle Scholar
Kwan, J.: 1977, Ap. J. 216, p. 713.CrossRefGoogle Scholar
Kwan, J.: 1979, Bull. AAS 11, p. 688.Google Scholar
Kwan, J. and Scoville, N.: 1976, Ap. J. (Letters) 210, L39.CrossRefGoogle Scholar
London, R., McCray, R., and Chu, S. I.: 1977, Ap. J. 217, p. 442.CrossRefGoogle Scholar
McKee, C. F. and Hollenbach, D. J.: 1980 Ann. Rev. of Astron. 18, in press.CrossRefGoogle Scholar
Nadeau, D. and Geballe, T. R.: 1979, Ap. J. (Letters) 230, L169.CrossRefGoogle Scholar
Phillips, T. G., Huggins, P. J., Neugebauer, G., and Werner, M. W.: 1977, Ap. J. Letters 217, L161.CrossRefGoogle Scholar
Schwartz, R. D.: 1978, Ap. J. 223, p. 884.CrossRefGoogle Scholar
Scoville, N. Z., Hall, D. N. B., Kleinmann, S. G., and Ridgway, S. T.: 1980, paper presented at IAU Symposium #96 on Infrared Astronomy.Google Scholar
Scoville, N. Z., Gezari, D. Y., Chin, G., and Joyce, R. R.: 1979, Astron, J. 84, p. 1571.CrossRefGoogle Scholar
Simon, M., Righini-Cohen, G., Joyce, R. R., and Simon, T.: 1979, Ap. J. (Letters) 230, L175.CrossRefGoogle Scholar
Storey, J. W. V., Watson, D. M., Townes, C. H., Haller, E. E. and Hansen, W. L.: 1980 preprint, paper presented at IAU Symposium #96 on Infrared Astronomy.Google Scholar
Telesco, C. M., Harper, D. A., and Loewenstein, R. F.: 1976, Ap. J. (Letters) 203, L53.CrossRefGoogle Scholar
Thompson, R. I., Lebofsky, M. J., and Rieke, G. H.: 1978, Ap. J. (Letters) 222, L49.CrossRefGoogle Scholar
Treffers, R. R.: 1979, Ap. J. (Letters), 233, L17.CrossRefGoogle Scholar
Treffers, R. R., Fink, U., Larson, H. P., and Gautier, T. N. III: 1976, Ap. J. 209, p. 793.CrossRefGoogle Scholar
Ulrich, R. K.: 1976, Ap. J. 210, p. 377.CrossRefGoogle Scholar
Werner, M. W., Gatley, I., Harper, D. A., Becklin, E. E., Loewenstein, R. F., Telesco, C. M., and Thronson, H. A.: 1976, Ap. J. 204, p. 420.CrossRefGoogle Scholar
Wilson, T. L., Downes, D., and Bieging, J.: 1979, Astron. & Astrophys. 71, p. 275.Google Scholar
Young, E. T. and Knacke, R. F.: 1980, paper presented at IAU Symposium #96 on Infrared Astronomy.Google Scholar
Zuckerman, B.: 1973, Ap. J. 183, p. 863.CrossRefGoogle Scholar
Zuckerman, B., Kuiper, T. B. H., and Rodriguez Kuiper, E. N.: 1976, Ap. J. (Letters) 209, L137.CrossRefGoogle Scholar