1 / 10

Conference Summary

Conference Summary. Mark Krumholz. Highlights. Sub-pc scale observations of “cores” Statistical studies: where do massive stars form? Magnetic fields: actually measured! HII regions: there’s more to life than the Spitzer solution Cosmic rays: the elephant in the room.

mari-mccall
Download Presentation

Conference Summary

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Conference Summary Mark Krumholz

  2. Highlights • Sub-pc scale observations of “cores” • Statistical studies: where do massive stars form? • Magnetic fields: actually measured! • HII regions: there’s more to life than the Spitzer solution • Cosmic rays: the elephant in the room Warning: this is theorist-biased, and there are rants ahead…

  3. 84 M 197 M 7.0 M 8.1 M 6.3 M 10 M 86 M 85 M 22 M  CFE % 11 M 13 M 14 M Cygnus X  106 M 58 M   55 M           Ophiuchi 104 105 106 Density cm-3 Sub-pc Fragmentation Zhang, Longmore, Hunter, Pillai, Bontemps CFE vs. density, Bontemps Exciting possibility: are we seeing the scales on which fragmentation stops? If so, what does that tell us? Cygnus X, Bontemps

  4. Dynamical State of Cores Request to observers: please put physical (not angular) scales on your plots, agree on a single definition for the virial ratio, and use matched size / density to measure it!

  5. Comparison to Simulations Simulated line observation of massive disk / toroid, Krumholz+ 2007 Distribution of core centroid velocities, comparing simulation to observed distribution in Oph and Perseus, Offner+ 2008 A plea to observers: there are simulated observations out there in the literature, please pay attention and compare to them!

  6. Statistics: What Sorts of Structures Make Massive Stars? IRDC properties vs. whether they form massive stars, Kauffmann / Pillai; also talk by Lopez-Sepulcre Separate structures that form massive stars from those that don’t: an excellent way to test theory

  7. B Fields: Real Observations! B fields from polarization in G31.41+0.31, Girart Goldreich-Kylafis detection, Beuther Magnetic fields seem to be dynamically important, but not able to halt collapse in massive SF regions

  8. B Fields: Caveats • Chandrasekhar-Fermi-type field inferences often systematically higher than Zeeman; this is worrying • Need cross-check in collapse simulations, not just turbulent boxes • Please, please, please: be consistent in defining virial and mass to flux ratios!

  9. HII Regions: More Physics Pressures of various sorts in 30 Dor, Lopez Also talks by Churchwell and Rowell, poster by Henny Starting to pay attention to HII regions including more physics, e.g. winds, radiation, is necessary to understand SFE, GMC lifetime.

  10. Cosmic Rays: Ubiquitous Cosmic ray maps of the LMC, including 30 Dor, and Wd 2, Rowell talk Wd 2 map Are they important for thermal behavior? For dynamics? What are the signatures of each?

More Related