Abstract
The flux of high energy γ-rays (E≳50 Mev) from the Galactic plane may be used to place limits on the density of H2 in the Galaxy. Here the density of H2 in the molecular ring (R = 6 kpc) is examined. It is shown that the upper limit on the surface density of H2 is slightly less than estimates based on CO observations and that the most likely value is much less (about 3.5 M⊙pc−2).
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Caraveo, P. et al.: 1980, Astron. Astrophys. 91, pp.L3–L5.
Gordon, M.A., and Burton, W.B.: 1976, Astrophys. J. 208, pp. 346–353.
Henderson, A.P., Jackson, P.D., and Kerr, F.J.: 1982, Astrophys. J. (in press).
Issa, M.R., Riley, P.A., Strong, A.W., and Wolfendale, A.W.: 1981, J. Phys. G. 7, pp. 973–994.
Issa, M.R., and Wolfendale, A.W.: 1981, Nature, 292, pp. 430–433.
Li, Ti pei, Riley, P.A., and Wolfendale, A.W.: 1982, J. Phys. G. 8, pp. 1141–1154.
Li, Ti pei, Riley, P.A., and Wolfendale, A.W.: 1983, to be published in M.N.R.A.S.
Liszt, H.S., Xiang, D., and Burton, W.B.: 1982, Astrophys. J. (in press).
Mayer-Hasselwander, H.A. et al. (Caravane Collaboration): 1982, Astron. Astrophys. 105, pp. 164–175.
Pagel, B.E.J., and Edmunds, M.G.: 1981, Ann. Rev. Astron. Astrophys. 19, pp. 77–113.
Phillips, S., Kearsey, S., Osborne, J.L., Haslam, C.G.T., and Stoffel, H.: 1981, Astron. & Astrophys. 98, pp. 286–294.
Riley, P.A., and Wolfendale, A.W.: 1981, Nuovo Cimento Vol. 4, No. 4, pp. 1–29.
Scoville, N.Z., and Solomon, P.M.: 1975, Astrophys. J. Lett. 199, pp. L105–L109.
Solomon, P.M., and Sanders, D.B.: 1980, Giant Molecular Clouds in the Galaxy, Ed. Solomon and Edmunds (Pergamon Press), pp. 41-73.
van Woerden, H.: 1956, Trans. I.A.U. 12A, pp. 789.
Wolfendale, A.W.: 1980, I.A.U. Symp. No. 94, pp. 309–319.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1983 Springer Science+Business Media Dordrecht
About this paper
Cite this paper
Riley, P.A., Wolfendale, A.W. (1983). Limits on the Surface Density of Molecular Hydrogen from Cosmic Gamma Ray Data. In: Burton, W.B., Israel, F.P. (eds) Surveys of the Southern Galaxy. Astrophysics and Space Science Library, vol 105. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7217-9_11
Download citation
DOI: https://doi.org/10.1007/978-94-009-7217-9_11
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-009-7219-3
Online ISBN: 978-94-009-7217-9
eBook Packages: Springer Book Archive