IMAGING AN EVENT HORIZON: MITIGATION OF SCATTERING TOWARD SAGITTARIUS A*
Name
Fish-2014-IMAGING AN EVENT HOR.pdf
Size
776.64 KB
Format
Adobe PDF
Checksum (MD5)
aa2f59784aad5d2eb3a7e1ea7580b692
Author(s)
Fish, Vincent L.
Johnson, Michael D.
Lu, Rusen
Doeleman, Sheperd Samuel
Bouman, Katherine L.
Zoran, Daniel
Freeman, William T.
Psaltis, Dimitrios
Narayan, Ramesh
Pankratius, Victor
Date Issued
October 2014
Journal
Astrophysical Journal
Publisher
Institute of Physics/American Astronomical Society
Citation
Fish, Vincent L., Michael D. Johnson, Ru-Sen Lu, Sheperd S. Doeleman, Katherine L. Bouman, Daniel Zoran, William T. Freeman, et al. “IMAGING AN EVENT HORIZON: MITIGATION OF SCATTERING TOWARD SAGITTARIUS A*.” The Astrophysical Journal 795, no. 2 (October 22, 2014): 134. © 2014 American Astronomical Society.
Version
Final published version
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 μas. Structure on these scales can be resolved by millimeter-wavelength very long baseline interferometry. However, strong-field GR features of interest will be blurred at λ ≥ 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.
MIT Department
Haystack Observatory
Massachusetts Institute of Technology. Computer Science and Artificial Intelligence Laboratory
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/0004-637x/795/2/134
