Three-dimensional analysis of the Minispiral at the Galactic Center: orbital parameters, periods and the mass of the black hole

Maria Selina Nitschai, Nadine Neumayer, Anja Feldmeier-Krause

In this paper we simultaneously fit the orbits and line-of-sight velocities of the ionized gas around the supermassive black hole, Sagittarius A${}^{\ast }$ (Sgr A${}^{\ast }$), at the c…