Chilingarian: High Energy Physics in Atmosphere (HEPA) and lightning initiation / Murchikova: The first detection of warm ionized disk around Milky Way's Galactic Center black hole

Nov 14, 2017 - 11:00 am to 12:00 pm

Campus, Varian 355

Ashot Chilingarian (Yerevan Physics Institute) and Elena Murchikova (Caltech)


The Milky Way's supermassive black hole SgrA* is our key to understanding black holes’ immediate environments, their growth and physics near the even horizon. Yet the properties of our Galactic Center black hole’s immediate environment are largely unconstrained, and the accretion on to it is a somewhat mysterious topic. We will discuss the first detection of warm ionized disk within ~0.008pc around SgrA* using a novel probe for this region submm recombination lines of hydrogen with ALMA. We will do order of magnitude estimations of the disk’s properties and speculate about its origin. We will also talk about the upcoming in spring close flyby of the S2 star about SgrA* and what we can learn from it about the black hole’s environment.