Spectral changes for cosmic ray protons in the local interstellar medium.

Details Spectral changes for cosmic ray protons in the local interstellar medium. Spectral changes for cosmic ray protons in the local interstellar medium.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.407f&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.407-410

Astronomy and Astrophysics

Astrophysics

3

Gamma Rays: Theory, Cosmic Rays, Ism, Solar Neighbourhood

Scientific paper

Analysis of EGRET data, together with results at other wavelengths, leads to confirmation of earlier claims using COS B data that there are spectral variations of the proton component over the local ISM (within several hundred parsecs). Most notably, the spectrum is steeper in the interarm and HI `tongue'-regions. An interesting feature is that the average spectrum of gamma rays above 1GeV is flatter than expected from the proton spectrum at earth. Interpretations of the results are offered.

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