From Cloud to Cluster: A Tale of Orion Steven Stahler Eric Huff.

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Presentation transcript:

From Cloud to Cluster: A Tale of Orion Steven Stahler Eric Huff

T associationsopen clustersOB associations two influences: 1 low-mass outflows 2 self-gravity mostly 11 and 2mostly 2 dispersal dispersal + contraction

T associationsopen clustersOB associations two influences: 1 low-mass outflows 2 self-gravity mostly 11 and 2mostly 2 dispersal dispersal + contraction

Accelerating Contraction dissipation contraction increase as in stars shocks virial theorem

supported Observation: Clouds supported by turbulence. virial theorem Larson 1981

Idealized Model spherical, isothermal turbulent dissipation Mac Low 1999 star formation Jones & Walker 1989 Schmidt 1959 (n=1) low mass only

Contraction and Expansion unstable

Density Spike massive stars?

Velocity Profiles

Low-Mass Stars in the ONC Schmidt law

Conclusions Clouds supported by dissipative, turbulent pressure undergo - - accelerating contraction - accelerating star formation Schmidt law reproduces ONC low-mass star formation. Density spike provides environment for high-mass star formation.

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