The first detection of warm ionized disk around the Galactic Center Black Hole SgrA*

Elena Murchinkova (Caltech)

The Milky Way's own supermassive black hole SgrA* is our best hope for studying black holes' immediate environments and their growth. Among the wide variety of accretion models, the only thing we know with certainty is that the amount of the material around SgrA* is small and its accretion is very low. I report the first detection of the warm 10^4 K ionized disk within 0.015pc the black hole in recombination line of Hydrogen (n=31 -> 30 transition) on ALMA, which Hot gas tends to cool very efficiently up to 10^4 K after which the cooling slows down substantially, therefore such warm gas is the likely accretion reservoir of the black hole. I will discuss the disk dynamics, and describe our future observations (scheduled and perspective), which will determine the presence of neutral hydrogen in the accretion zone and improve our knowledge of the detected warm disk using the close flyby of the S2 star by the galactic center in April 2018.

Thursday, October 5, 2017