Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362..114h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 10, 1990, p. 114-119.
Astronomy and Astrophysics
Astrophysics
49
Accretion Disks, Cosmic Dust, Galactic Nuclei, Interstellar Magnetic Fields, Milky Way Galaxy, Ring Structures, Thermal Emission, Angular Momentum, Far Infrared Radiation, Interstellar Matter
Scientific paper
Measurements of the polarization of the far-infrared thermal emission from six points in the dust ring at Sgr A are presented. The position angles are approximately perpendicular to the long axis of the ring as projected on the sky. The inferred magnetic field is therefore approximately in the plane of the ring. The pattern traced by the polarization vectors resembles that expected for a magnetic accretion disk. The measurements indicate a field in which the outward radial component is much greater than the axial component at the surface of the disk. The field thus appears to satisfy the condition proposed by Blandford and Payne (1982) for removing energy and angular momentum through centrifugal acceleration of surface material moving along the field lines.
Davidson Jacqueline A.
Gonatas Dinos P.
Hildebrand Roger H.
Morris Marita
Novak Giles
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