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

Авторы: Blom J.J., Bloemen H., Bykov A.M., Burton W.B., Hartmann D., Hermsen W., Iyudin A.F., Ryan J., Schoenfelder V., Strong A.W., Uvarov Yu A.
Журнал: Astronomy and Astrophysics, v.321, p.288-292
Том: 321
Год издания: 1997
Первая страница: 288
Последняя страница: 292
Аннотация: 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 gamma-radiation at 0.75-3MeV from the general direction of the HVC Complexes M and A, adjacent to the Lockman et al. hole. The gamma-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 gamma-ray emission. We show that the X-ray and gamma-ray emission can both be attributed to non-thermal electron bremsstrahlung arising from HVC interactions with the galactic disk or lower halo.
Добавил в систему: Июдин Анатолий Федорович

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