Journal
ASTROPHYSICAL JOURNAL
Volume 794, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/794/2/150
Keywords
black hole physics; Galaxy: center; submillimeter: general; techniques: high angular resolution; techniques: interferometric; techniques: polarimetric
Categories
Funding
- National Science Foundation [AST-1207752, AST-1310896, AST-1211539]
- Gordon and Betty Moore Foundation [GBMF-3561]
- Perimeter Institute for Theoretical Physics
- Natural Sciences and Engineering Research Council of Canada through a Discovery Grant
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research and Innovation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1207752, 1140030, 1337663, 1207704] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1126433, 1310896] Funding Source: National Science Foundation
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We demonstrate that polarimetric interferometry can be used to extract precise spatial information about compact polarized flares of Sgr A*. We show that, for a faint dynamical component, a single interferometric baseline suffices to determine both its polarization and projected displacement from the quiescent intensity centroid. A second baseline enables two-dimensional reconstruction of the displacement, and additional baselines can self-calibrate using the flare, enhancing synthesis imaging of the quiescent emission. We apply this technique to simulated 1.3 mm wavelength observations of a hot spot embedded in a radiatively inefficient accretion disk around Sgr A*. Our results indicate that, even with current sensitivities, polarimetric interferometry with the Event Horizon Telescope can achieve similar to 5 mu as relative astrometry of compact flaring structures near Sgr A* on timescales of minutes.
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