ALMA and VLA Observations of Proplyd Candidates near Sgr A*

Yusef-Zadeh, Farhad; Cotton, William D.; Royster, Marc; Kunneriath, Devaky; Wardle, M.; Roberts, D. A.; Wootten, Al; Schoedel, R.

January, 2017
ABSTRACT: 

Using the VLA, we recently detected a large number of protoplanetary disk (proplyd) candidates lying within a couple of light years of the massive black hole Sgr A*. The bow-shock appearance of proplyd candidates point toward the young massive stars located near Sgr A*. Similar to Orion proplyds, the strong UV radiation from the cluster of massive stars at the Galactic center is expected to photoevaporate and photoionize the circumstellar disks around young, low mass stars, thus allowing detection of the ionized outflows. To confirm this interpretation, ALMA observations detect millimeter emission at 226 GHz from five proplyd candidates that had been detected at 44 and 34 GHz with the VLA. We determine the mass of protoplanetary disks from cool dust emission. These measurements show the presence of on-going star formation with the implication that gas clouds can survive near Sgr A* and the relative importance of high vs low-mass star formation in the strong tidal and radiation fields of the Galactic center.