It is shown that the matter concentration observed through stellar motion at the Galactic center is consistent with a supermassive object of 2.5 × 106 solar masses composed of self-gravitating, degenerate, heavy neutrinos. This result is opposed to the alternative black hole interpretation. According to the observational data, the lower bounds on possible neutrino masses are mν ≥ 12.0 keV/c2 for g = 2 or mν ≥ 14.3 keV/c2 for g = 1, where g is the spin degeneracy factor. The advantage of this scenario is that it could naturally explain the low X-ray and gamma-ray activity of Sgr A*, i.e., the so-called blackness problem of the Galactic center.
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