Artículo
Resolving the Polarized Dust Emission of the Disk around the Massive Star Powering the HH 80-81 Radio Jet
Girart, J. M.; Fernandez Lopez, Manuel
; Li, Z. Y.; Yang, H.; Estalella, R.; Anglada, G.; Anez López, N.; Busquet, G.; Carrasco González, C.; Curiel, S.; Galvan Madrid, R.; Gómez, J. F.; Gregorio Monsalvo, I. De; Jiménez Serra, I.; Krasnopolsky, R.; Marti, J.; Osorio, M.; Padovani, M.; Rao, R.; Rodriguez, L. F.; Torrelles, J. M.
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Fecha de publicación:
04/2018
Editorial:
IOP Publishing
Revista:
Astrophysical Journal Letters
ISSN:
2041-8205
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Here we present deep (16 μJy beam-1), very high (40 mas) angular resolution 1.14 mm, polarimetric, Atacama Large Millimeter/submillimeter Array (ALMA) observations toward the massive protostar driving the HH 80-81 radio jet. The observations clearly resolve the disk oriented perpendicularly to the radio jet, with a radius of ≃0.″171 (∼291 au at 1.7 kpc distance). The continuum brightness temperature, the intensity profile, and the polarization properties clearly indicate that the disk is optically thick for a radius of R ≲ 170 au. The linear polarization of the dust emission is detected almost all along the disk, and its properties suggest that dust polarization is produced mainly by self-scattering. However, the polarization pattern presents a clear differentiation between the inner (optically thick) part of the disk and the outer (optically thin) region of the disk, with a sharp transition that occurs at a radius of ∼0.″1 (∼170 au). The polarization characteristics of the inner disk suggest that dust settling has not occurred yet with a maximum dust grain size between 50 and 500 μm. The outer part of the disk has a clear azimuthal pattern but with a significantly higher polarization fraction compared to the inner disk. This pattern is broadly consistent with the self-scattering of a radiation field that is beamed radially outward, as expected in the optically thin outer region, although contribution from non-spherical grains aligned with respect to the radiative flux cannot be excluded.
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Articulos(IAR)
Articulos de INST.ARG.DE RADIOASTRONOMIA (I)
Articulos de INST.ARG.DE RADIOASTRONOMIA (I)
Citación
Girart, J. M.; Fernandez Lopez, Manuel; Li, Z. Y.; Yang, H.; Estalella, R.; et al.; Resolving the Polarized Dust Emission of the Disk around the Massive Star Powering the HH 80-81 Radio Jet; IOP Publishing; Astrophysical Journal Letters; 856; 2; 4-2018; 1-7
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