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Star Formation: The good, the bad, and the ugly

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A talk on star formation and stellar clustering. Here we review some of the topics that are well-known (the general picture) to the poorly understood (young massive cluster formation).

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Star Formation: The good, the bad, and the ugly

  1. 1. Star Formation GOOD BAD UGLY THE THE ANDTHE Eli Bressert @astrobiased
  2. 2. GOODTHE Molecular clouds Cores Young stellar objects Disks & planets
  3. 3. Molecular cloud cores Stars Gas 1 2 3
  4. 4. 1 2 3 age < ? million years 10 pc < scale < 500 pc age < 0.5 million years scale < 10000 AU age < 10 million years scale < 500 AU
  5. 5. PLANET!!! [Not to scale]
  6. 6. BAD THE Different modes of star formation? Massive stars only form in massive clusters?
  7. 7. Different modes of star formation?
  8. 8. Distributed Clustered [Simulated]
  9. 9. ⇤ = j 1 ( r2 j ) Casertano & Hut 1985 5th closest
  10. 10. Histogram ClusteredDistributed
  11. 11. Clustered Distributed Cumulative
  12. 12. Cumulative Bressert et al. (2010) Carpenter (2000) Gutermuth et al. (2009) Lada & Lada (2003) Jørgensen et al. (2008) Megeath et al. (in prep.)
  13. 13. Different modes of star formation? Unlikely
  14. 14. Can massive stars form in isolation?
  15. 15. Why is it important? 1 2 initial mass function star formation models
  16. 16. 10 x
  17. 17. P( ) P( )= 50 M☉ 50 M☉
  18. 18. P( ) P( )= Stochastic Sorted P( ) P( )=
  19. 19. How can we test it ... and where?
  20. 20. Weidner et al. 2010 log(Mcluster / Msun) log(Mstar/Msun) Weidner et al. (2010) Isolated!!!
  21. 21. 100 pc Credit: ESO/VISTA Magellanic Cloud survey Tarantula Nebula
  22. 22. Line ofsight Plane of sky N ew Molecular filaments (MF) Bressert et al. (2012)
  23. 23. ESO/M.-R. Cioni/VISTA Magellanic Cloud survey PI: Chris Evans http://arxiv.org/abs/1103.5386 800 OB Stars 300 O-stars 180 Single O-stars VFTS
  24. 24. Likely Can massive stars form in isolation?
  25. 25. UGLY ANDTHE How do young massive clusters form? What do the progenitors look like? How do we find them ?
  26. 26. Credit: ESO/VISTA Magellanic Cloud survey 100 pc R136 1-2 Myr >104 M⊙ SFE > 30 %
  27. 27. 15 pc Credit: ESO/S. Guisard Ophiuchus ~2 Myr ~102 M⊙ SFE < 10 %
  28. 28. Meanwhile, back in the Galactic Centre ...
  29. 29. The Brick Longmore et al. (2012) Credit: NASA/JPL-Caltech/GLIMPSE Team
  30. 30. PI: Jill Rathborne ALMA Cycle 0
  31. 31. Prediction Bressert et al. (2012) Ginsburg et al. (2012) All YMC progenitors in MW are detectable with current surveys1Like HST on globular clusters, ALMA will shed light on extragalactic YMC progenitors2
  32. 32. Longmore et al. (2013) Credit: NASA/JPL-Caltech/GLIMPSE Team The Brick bricklets
  33. 33. Not much How much do we know about YMC formation?
  34. 34. ?

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