Unresolved Galactic gamma ray sources and the determination of the CO/? conversion factor

Details Unresolved Galactic gamma ray sources and the determination of the CO/? conversion factor Unresolved Galactic gamma ray sources and the determination of the CO/? conversion factor

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jphg...22.1089f&link_type=abstract

Journal of Physics G: Nuclear and Particle Physics, Volume 22, Issue 7, pp. 1089-1096 (1996).

Physics

8

Scientific paper

The derivation of the factor `X' used to convert the line integral of the 0954-3899/22/7/014/img6 emission over velocity 0954-3899/22/7/014/img7 to the column density of molecular hydrogen 0954-3899/22/7/014/img8 is a topic that has exercised the astronomical community for over a decade. Early work gave `high' values whereas we ourselves have consistently advocated a `low' value, specifically, for the Inner Galaxy, 0954-3899/22/7/014/img9 (see Bhat et al 1985 Nature 314 511, and later papers). Very recently, a new 0954-3899/22/7/014/img10-ray value has come from the analysis of the EGRET data from the Compton Gamma Ray Observatory (CGRO) (Hunter et al 1996 Astrophys. J. in press). This new value is 0954-3899/22/7/014/img11 units but we here advocate its reduction by 0954-3899/22/7/014/img12 to allow for unresolved discrete sources.

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