The Early Stages of High-Mass Star Formation

Astronomy Unit Seminars
Claudia Cyganowski
Izaskun Jimenez-Serra
October 27th, 2017 at 14:30
GO Jones Room 610

Most stars form in clusters, yet basic aspects of how this occurs remain unknown, including the relative birth order of high and low mass stars. In clump-scale "competitive accretion"-type models, massive stars and their surrounding cluster of lower mass stars form simultaneously. Thus a key, testable prediction of these models is that centrally condensed low-mass cores should exist within the accretion reservoir of a forming massive star.  I will present results from an ALMA Cycle 2 program to search for low-mass cores within the accretion reservoir of a high-mass (proto)cluster.  Our ALMA mosaic, with a linear resolution of ~1700 AU, reveals a rich population of low-mass cores surrounding the central, massive (proto)cluster members, consistent with the predictions of competitive accretion models.  I will also present high-resolution SMA observations of two of the massive (proto)cluster members: MM2, arguably the best candidate to date for a massive starless (prestellar) core, and MM1, a young proto-O star with an apparently Keplerian disk.