Imaging an Event Horizon: Mitigation of Scattering Toward Sagittarius A*
Abstract
The image of the emission surrounding the black hole in the center of the Milky Way is predicted to exhibit the imprint of general relativistic (GR) effects, including the existence of a shadow feature and a photon ring of diameter ~50 microarcseconds. Structure on these scales can be resolved by millimeter-wavelength very long baseline interferometry (VLBI). However, strong-field GR features of interest will be blurred at lambda >= 1.3 mm due to scattering by interstellar electrons. The scattering properties are well understood over most of the relevant range of baseline lengths, suggesting that the scattering may be (mostly) invertible. We simulate observations of a model image of Sgr A* and demonstrate that the effects of scattering can indeed be mitigated by correcting the visibilities before reconstructing the image. This technique is also applicable to Sgr A* at longer wavelengths.
Keywords
Cite
@article{arxiv.1409.4690,
title = {Imaging an Event Horizon: Mitigation of Scattering Toward Sagittarius A*},
author = {Vincent L. Fish and Michael D. Johnson and Ru-Sen Lu and Sheperd S. Doeleman and Katherine L. Bouman and Daniel Zoran and William T. Freeman and Dimitrios Psaltis and Ramesh Narayan and Victor Pankratius and Avery E. Broderick and Carl R. Gwinn and Laura E. Vertatschitsch},
journal= {arXiv preprint arXiv:1409.4690},
year = {2015}
}
Comments
7 pages, accepted to ApJ