The Dynamics of an Expanding OB Association
Nicholas J. Wright, Herve Bouy, Jeremy J. Drake, Janet E. Drew, Mario, Guarcello, David Barrado y Navacues
TL;DR
This study uses 3D kinematic data of Cygnus OB2 to investigate how young star clusters disperse, finding evidence against traditional disruption theories and supporting hierarchical star formation models.
Contribution
It provides the first detailed 3D kinematic analysis of Cygnus OB2, challenging existing disruption theories and supporting hierarchical star formation.
Findings
OB association is highly substructured and dynamically unmixed
No position-velocity correlations support infant mortality or tidal stripping theories
Supports hierarchical star formation as the primary process
Abstract
We present 3-dimensional kinematical observations of the massive OB association Cygnus OB2 to identify the mechanisms responsible for disrupting young star clusters. The picture revealed by these observations is of a highly-substructured, dynamically unmixed OB association that does not exhibit the position-velocity correlations predicted by the theories of infant mortality or tidal stripping. These observations would appear to support a picture of hierarchical star formation.
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