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Title:
Polarimetric Imaging of the Massive Black Hole at the Galactic Center
Authors:
Bromley, Benjamin C.; Melia, Fulvio; Liu, Siming
Affiliation:
AA(Department of Physics, University of Utah, 201 James Fletcher Building, Salt Lake City, UT 84112.), AB(Department of Physics, University of Arizona, Tucson, AZ 85721; Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; Sir Thomas Lyle Fellow and Miegunyah Fellow.), AC(Department of Physics, University of Arizona, Tucson, AZ 85721.)
Publication:
The Astrophysical Journal, Volume 555, Issue 2, pp. L83-L86. (ApJL Homepage)
Publication Date:
07/2001
Origin:
UCP
Astronomy Keywords:
Accretion, Accretion Disks, Black Hole Physics, Galaxy: Center, Hydrodynamics, Magnetic Fields, Radiation Mechanisms: Nonthermal
DOI:
10.1086/322862
Bibliographic Code:
2001ApJ...555L..83B

Abstract

The radio source Sagittarius A* in the Galactic center emits a polarized spectrum at millimeter and submillimeter wavelengths that is strongly suggestive of relativistic disk accretion onto a massive black hole. We use the well-constrained mass of Sgr A* and a magnetohydrodynamic model of the accretion flow to match both the total flux and polarization from this object. Our results demonstrate explicitly that the shift in the position angle of the polarization vector, seen at wavelengths near the peak of the millimeter to submillimeter emission from this source, is a signal of relativistic accretion flow in a strong gravitational field. We provide maps of the polarized emission to illustrate how the images of polarized intensity from the vicinity of the black hole would appear in upcoming observations with very long baseline radio interferometers (VLBIs). Our results suggest that near-term VLBI observations will be able to directly image the polarized Keplerian portion of the flow near the horizon of the black hole.
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