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http://hdl.handle.net/20.500.12386/27732
Titolo: | Resolving the Polarized Dust Emission of the Disk around the Massive Star Powering the HH 80-81 Radio Jet | Autori: | Girart, J. M. Fernández-López, M. Li, Z. -Y. Yang, H. Estalella, R. Anglada, G. Áñez-López, N. Busquet, G. Carrasco-González, C. Curiel, S. Galvan-Madrid, R. Gómez, J. F. de Gregorio-Monsalvo, I. Jiménez-Serra, I. Krasnopolsky, R. Martí, J. Osorio, M. Padovani, Marco Rao, R. Rodríguez, L. F. Torrelles, J. M. |
Data pubblicazione: | 2018 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 856 | Fascicolo: | 2 | Da pagina:: | L27 | Abstract: | Here we present deep (16 μJy beam<SUP>-1</SUP>), 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. | URI: | http://hdl.handle.net/20.500.12386/27732 | URL: | https://iopscience.iop.org/article/10.3847/2041-8213/aab76b | ISSN: | 0004-637X | DOI: | 10.3847/2041-8213/aab76b | Bibcode ADS: | 2018ApJ...856L..27G | Fulltext: | open |
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