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Cloud-to-Cloud Variations in H2Co-to-H2 Ratios

Published online by Cambridge University Press:  14 August 2015

W. A. Sherwood
W. A. Sherwood*
Affiliation:
Max-Planck-Institut für Radioastronomie

Extract

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The ratio H2CO/H2 has been determined for Heiles Cloud 2 (HC2) (Sherwood and Wilson, 1980, and references therein). Rather surprisingly, the ratio was much larger than that found by Kutner (1973) in a cloud KC only 3 degrees away. In both ratios the H2 density was determined from a relation between star counts and dust column density (see Sherwood and Wilson, 1980). Two other clouds have been studied in a similar manner: Khavtassi 3 (K3) (Myers, 1975) and ρ Oph (Myers et al., 1978). The ratio H2CO/H2 varies among the four clouds as does the minimum visual extinction apparently required before H2CO can form. The data are summarized in the Table. In all cases linear fits were used to determine H2CO/H2.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 87: Interstellar Molecules , 1980 , pp. 101 - 102
Copyright
Copyright © Reidel 1980 

References

Batrla, W.: 1979, Ph.D. Thesis, University of Erlangen-Nürnberg.Google Scholar
Blanco, V.M., Demers, S., Douglass, G.G., and FitzGerald, M.P.: 1968, Publ. U.S. Naval Obs., 2nd Series XXI.Google Scholar
Elias, J.H.: 1978, Astrophys. J. 224, 857.CrossRefGoogle Scholar
Grasdalen, G.L., Strom, K.M., and Strom, S.E.: 1973, Astrophys. J.(Letters) 184, L53.Google Scholar
Kutner, M.L.: 1973, Molecules in the Galactic Environment, ed. Gordon, M.A. and Snyder, L.E., J. Wiley, New York, p. 199.Google Scholar
Myers, P.C.: 1975, Astrophys. J. 198, 331.Google Scholar
Myers, P.C., Ho, P.T.P., Schneps, M.H., Chin, G., Pankonin, V, and Winnberg, A.: 1978, Astrophys. J. 220, 864.Google Scholar
Neckel, T.: 1967, Landessternwarte Heidelberg-Königsstuhl 19,Google Scholar
Sherwood, W.A., and Wilson, T.L.: 1980, Astron. Astrophys., to be submitted.Google Scholar
Sume, A., Downes, D., and Wilson, T.L.: 1975, Astron. Astrophys. 39, 435.Google Scholar