DARK-MATTER CONCENTRATION IN THE GALACTIC-CENTER

It is shown that the matter concentration observed through stellar mot ion at the Galactic center is consistent with a supermassive object of 2.5 x 10(6) solar masses composed of self-gravitating, degenerate, he avy neutrinos. This result is opposed to the alternative black hole in terpretation. According to the observational data, the lower bounds on possible neutrino masses are m(v) greater than or equal to 12.0 keV/c (2) for g = 2 or m(v) greater than or equal to 14.3 keV/c(2) for g = 1 , where g is the spin degeneracy factor. The advantage of this scenari o is that it could naturally explain the low X-ray and gamma-ray activ ity of Sgr A, i.e., the so-called blackness problem of the Galactic c enter.