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2002MNRAS.330..707K - Mon. Not. R. Astron. Soc., 330, 707-718 (2002/March-1)
Thickening of galactic discs through clustered star formation.
KROUPA P.
Abstract (from CDS):
The velocity dispersion of solar-neighbourhood stars increases more rapidly with stellar age than theoretical calculations of orbital diffusion predict. Interpreting this difference to arise from star formation characterized by larger cluster masses, rather than as yet unknown stellar-dynamical heating mechanisms, suggests that the star formation rate in the Milky Way disc has been quietening down, or at least shifting towards less massive star-forming units. Thin-disc stars with ages (formula) may have formed from an ICMF extending to very rich Galactic clusters. Stars appear to be forming preferentially in modest embedded clusters during the past 3Gyr.
Applying this approach to the ancient thick disc of the Milky Way, it follows that its large velocity dispersion may have been produced through a high star formation rate and thus an ICMF extending to massive embedded clusters (~105–6 M☉), even under the extreme assumption that early star formation occurred in a thin gas-rich disc. This enhanced star formation episode in an early thin Galactic disc could have been triggered by passing satellite galaxies, but direct satellite infall into the disc may not be required for disc heating.
Abstract Copyright: 2002 Blackwell Science Ltd
Journal keyword(s): stars: kinematics - Galaxy: evolution - Galaxy: formation - globular clusters: general - open clusters and associations: general - Galaxy: structure
Simbad objects: 7
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