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Colloquium by Neal Evans (University of Texas at Austin)

Do Stars form by Gravitational Collapse?


We have long assumed that stars form by gravitational collapse but hard evidence of infalling motions has been elusive. The Bok Globule, B335, has been the test bed for studies of simple isolated star formation. Our ALMA Cycle 1 observations of this source have revealed definitive kinematic evidence for infall in the form of redshifted absorption against the continuum source. Approximately spherical infall appears to extend inward to about 16 AU. Further studies of this and other sources will allow us to study the velocity fields of infalling matter and the transition to a rotationally supported disk, possibly through the formation of a magnetically supported pseudo-disk.

Time: November 9, 2016, 14:30 pm

Venue: A601, NAOC