Cosmic gamma rays and the mass of gas in the Galaxy

Details Cosmic gamma rays and the mass of gas in the Galaxy Cosmic gamma rays and the mass of gas in the Galaxy

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...203..289r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 203, no. 2, Sept. 1988, p. 289-292.

Astronomy and Astrophysics

Astrophysics

7

Cosmic Rays, Gamma Rays, Hydrogen, Interstellar Gas, Milky Way Galaxy, Carbon Monoxide, Interstellar Extinction, Magellanic Clouds

Scientific paper

A technique based on cosmic gamma-ray intensity measurements is used to redetermine the conversion factor alpha20 used to estimate the H2 column density from the CO line temperature. The method is described in detail, and results are presented in graphs. For the local region of the Galaxy alpha20 is found to be about 3 x 10 to the 20th sec/sq cm K km. Applying this value to the CO survey data of Dame et al. (1987), the mass of H2 in the Galaxy is estimated as 6.4 x 10 to the 8th solar masses if alpha20 is constant throughout and 4.5 x 10 to the 8th solar masses if alpha20 decreases toward the Galactic center.

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