2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/14562When a black hole accretes slowly, the radiative cooling of the infalling gas is weak and the accretion disk does not form. A hot collisionless quasi-spherical halo is formed instead. The properties of such halos are discussed. The rate of accretion, the radiative efficiency, and the temperature and density near the hole are evaluated.7 pages, Proceedings IAU Symposium 195Astrophysicstext