SIMBAD references

2016ApJ...832..200F - Astrophys. J., 832, 200-200 (2016/December-1)

1.3 mm polarized emission in the circumstellar disk of a massive protostar.

FERNANDEZ-LOPEZ M., STEPHENS I.W., GIRART J.M., LOONEY L., CURIEL S., SEGURA-COX D., ESWARAIAH C. and LAI S.-P.

Abstract (from CDS):

We present the first resolved observations of the 1.3 mm polarized emission from the disk-like structure surrounding the high-mass protostar Cepheus A HW2. These CARMA data partially resolve the dust polarization, suggesting a uniform morphology of polarization vectors with an average position angle of 57±6○^ and an average polarization fraction of 2.0 % ±0.4 % . The distribution of the polarization vectors can be attributed to (1) the direct emission of magnetically aligned grains of dust by a uniform magnetic field, or (2) the pattern produced by the scattering of an inclined disk. We show that both models can explain the observations, and perhaps a combination of the two mechanisms produces the polarized emission. A third model including a toroidal magnetic field does not match the observations. Assuming scattering is the polarization mechanism, these observations suggest that during the first few 104 years of high-mass star formation, grain sizes can grow from 1 µm to several 10s µm.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: individual objects: Cepheus A HW2 - ISM: magnetic fields - polarization - stars: formation - techniques: polarimetric - techniques: polarimetric

Simbad objects: 14

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2019.10.17-11:06:26

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