SIMBAD references

2015AJ....149...31J - Astron. J., 149, 31 (2015/January-0)

Grain alignment in starless cores.

JONES T.J., BAGLEY M., KREJNY M., ANDERSSON B.-G. and BASTIEN P.

Abstract (from CDS):

We present near-IR polarimetry data of background stars shining through a selection of starless cores taken in the K band, probing visual extinctions up to AV ∼ 48. We find that PK/TK continues to decline with increasing AV with a power law slope of roughly -0.5. Examination of published submillimeter (submm) polarimetry of starless cores suggests that by AV ≳ 20 the slope for P versus τ becomes : (-1, indicating no grain alignment at greater optical depths. Combining these two data sets, we find good evidence that, in the absence of a central illuminating source, the dust grains in dense molecular cloud cores with no internal radiation source cease to become aligned with the local magnetic field at optical depths greater than AV ∼ 20. A simple model relating the alignment efficiency to the optical depth into the cloud reproduces the observations well.

Abstract Copyright:

Journal keyword(s): dust, extinction - ISM: clouds - ISM: magnetic fields

Simbad objects: 22

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2019.11.17-07:07:24

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