“p-AV” in Star-Forming Regions: Grain Alignment Issues

• Dark clouds: bad grains or poor alignment?

  • Lazarian et al. 1997 suggest poor alignment

• Massive SFR: good grains or better alignment?

  • temperature and/or radiative environment

• Importance of non-Davis-Greenstein alignment mechanisms

  • e.g. radiative alignment of “helical” grains (Draine & Weingartner 1997)
  • streaming alignment (suggested in Orion BN/KL)

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