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Star Formation in a Dynamic Interstellar Medium

Star Formation in a Dynamic Interstellar Medium

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Star Formation in a Dynamic Interstellar Medium

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Presentation Transcript

  1. Star Formation in a Dynamic Interstellar Medium Workshop hosted by the Yale University Astronomy Department May 20, 2002 Simulation is a preview of work by Bate, Bonnell & Bromm…stay tuned

  2. The Plan Time Speaker Topic 09:40Alyssa Goodman (CfA/Yale) Introduction 10:00 Phil Myers(CfA) What are the properties of the observed environment for star formation? 10:40 Coffee Break 11:00 Richard Larson What are the real observational constraints on the IMF? 11:40 Paolo Padoan (Caltech/JPL) What have we learned from numerical simulations of the star-forming ISM, on >1 pc scales? 12:20 Lunch 1:50 Bruce Elmegreen (IBM) On what scale is an IMF determined, and how might the answer to this question change? (Opinion #1) 2:30 Ian Bonnell (U. St. Andrews) On what scale is an IMF determined, and how might the answer to this question change? (Opinion #2; simulation figure above from Bate, Bonnell & Bromm) 3:10 Coffee Break 3:30 Richard Larson (Yale) Thoughts, and an open fourm, on the day's presentations 4:00 Meeting Adjourns, but those interested stay on to chat

  3. Questions Raised by a Dynamic View of Star Formation

  4. “4. Powering source of (some) outflows may move rapidly through ISM.” Goodman & Arce 2002

  5. “Giant” Herbig-Haro Flow inPV Ceph 1 pc Reipurth, Bally & Devine 1997

  6. PV Ceph: Episodic ejections from precessing or wobblingmoving source Implied source motion ~7 km/s (3 mas/year) assuming jet velocity ~100 km/s Goodman & Arce 2002

  7. “4. Powering source of (some) outflows may move rapidly through ISM.” Goodman & Arce 2002

  8. HST WFPC2 Overlay: Padgett et al. 2002 Arce & Goodman 2002 Goodman & Arce 2002

  9. Trail & Jet Goodman & Arce 2002

  10. How much gas will be pulled along for the ride? Goodman & Arce 2002

  11. Insights from a “Plasmon” Model Initial jet 250 km s-1; star motion 10 km s-1

  12. Insights from a “Plasmon” Model