Artículo
1.3 mm Polarized emission in the circumstellar disk of a massive protostar
Fernandez Lopez, Manuel
; Stephens, I. W.; Girart, J. M.; Looney, L.; Curiel, S.; Segura Cox, D.; Eswaraiah, C.; Lai, S. P.

Fecha de publicación:
12/2016
Editorial:
IOP Publishing
Revista:
Astrophysical Journal
ISSN:
0004-637X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Resumen
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 from1 mm to several 10s μm.
Archivos asociados
http://dx.doi.org/10.3847/0004-637X/832/2/200
http://iopscience.iop.org/article/10.3847/0004-637X/832/2/200/meta
http://iopscience.iop.org/article/10.3847/0004-637X/832/2/200/meta

Citación:
Fernandez Lopez, Manuel; Stephens, I. W.; Girart, J. M.; Looney, L.; Curiel, S.; et al.; 1.3 mm Polarized emission in the circumstellar disk of a massive protostar; IOP Publishing; Astrophysical Journal; 832; 2; 12-2016; 1-9
Comunidades y colecciones
-
Articulos(IAR) [404]
Articulos de INST.ARG.DE RADIOASTRONOMIA (I)