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The effect of light refraction in a galaxy halo of dark matter, described byprofiles of Navarro-Frenk-White and Burkett, was considered. Powers of theCherenkov radiation for the refractive indexes of gravitational fields withthese profiles were calculated. It was shown that correspondent radiationtemperature in the X-rays range have the magnitude about some microKelvins. Itwas also marked that its detection may be the criteria on choosing thepreferable dark matter density distribution in a galaxy.

The Cherenkov radiation in the galaxy halo of dark matter