Accretion onto a Dupermassive Black Hole in Sgr A*

Abstract

We propose a model of accretion onto a black hole at the center of our Galaxy. This model describes a situation in which Sgr A* is accreting a hot stellar wind predominantly from star complex IRS13E. We further assume an existence of a cold, optically thick, geometrically thin disk that surrounds a black hole. A fraction of matter inflowing into area described by our model settles onto a disk. The rest of it is falling under horizon.

We estimate a fraction of matter that settles onto a disk. We assume that all kinetic energy is lost during the impact, and then re-radiated from the disk surface. Our main goal was to compare the modeled flux emitted by the disk with flux obtained from observations. Our calculations show that existence of such disk is rather excluded.