COMPTEL detection of low-energy gamma rays from the HVC Complex M and A region?

Details COMPTEL detection of low-energy gamma rays from the HVC Complex M and A region? COMPTEL detection of low-energy gamma rays from the HVC Complex M and A region?

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...321..288b&link_type=abstract

Astronomy and Astrophysics, v.321, p.288-292

Astronomy and Astrophysics

Astrophysics

9

Gamma Rays: Observations, Ism: Clouds, Ism: Individual Objects: Hvc Complex M, Complex A

Scientific paper

We report the first observational indication for extended MeV emission that may be associated with high-velocity clouds (HVCs). Based on a combination of fifteen COMPTEL observations made during the period 1991-1995 we find evidence for intense γ-radiation at 0.75-3MeV from the general direction of the HVC Complexes M and A, adjacent to the Lockman et al. hole. The γ-ray excess roughly covers a region of exceptionally low HI column densities and appears to consist of a time-variable source and persistent, likely diffuse, emission. The (enhanced) diffuse soft X-rays from this HVC area seen by ROSAT may be closely related to the γ-ray emission. We show that the X-ray and γ-ray emission can both be attributed to non-thermal electron bremsstrahlung arising from HVC interactions with the galactic disk or lower halo.

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