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ABSTRACT

Bloemen et al. 1984

Bloemen, J.B.G.M., P.A. Caraveo, W. Hermsen, F. Lebrun, R.J. Maddalena, A.W. Strong, and P. Thaddeus, 1984: Gamma rays from atomic and molecular gas in the large complex of clouds in Orion and Monoceros. Astron. Astrophys., 139, 37-42.

A comparison of COS-B gamma-ray observations of the large complex of interstellar clouds in Orion and Monoceros with the Columbia CO and Berkeley H I surveys of this region reveals a good correlation between gamma-ray emission and total gas distribution. The observed gamma-ray emission is explainable in terms of interactions of cosmic rays that are uniformly distributed in this region with the interstellar gas. The correlation is used as the basis of a calibration of the ratio between H2 column density and the integrated CO line intensity; the value of (2.6±1.2) × 1020 mol/cm2K km s thereby obtained is consistent with the value derived from a similar analysis for the inner galaxy.

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