Gradient model analysis of EGRET diffuse Galactic γ-ray emission.

Details Gradient model analysis of EGRET diffuse Galactic γ-ray emission. Gradient model analysis of EGRET diffuse Galactic γ-ray emission.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308l..21s&link_type=abstract

Astronomy and Astrophysics, v.308, p.L21-L24

Astronomy and Astrophysics

Astrophysics

209

Gamma Rays: General, Cosmics Rays: Interstellar Medium: Clouds: General, Interstellar Medium: General

Scientific paper

We have analysed the EGRET Phase 1+2 sky survey data using a model for the diffuse Galactic emission which the γ-ray emissivity per atom is a function of Galactocentric radius. The CO-to-H_2_ conversion factor is determined as 1.9+/-0.2x10^20^mols.cm^-2^/(K.km/s) for E=100-10000MeV; no significant energy dependence of this quantity is detected. The emissivity gradient is rather small, consistent with earlier COS-B results. The inverse-Compton component is detected at all energies. Emissivity and intensity spectra of the emission are presented. Above 1GeV we confirm the excess above that expected for π^0^-decay alredeay noted by the EGRET team.

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