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dc.contributor.authorÖzel, F.
dc.contributor.authorPsaltis, D.
dc.contributor.authorYounsi, Z.
dc.date.accessioned2024-01-24T05:45:42Z
dc.date.available2024-01-24T05:45:42Z
dc.date.issued2022-12-14
dc.identifier.citationÖzel, F., Psaltis, D., & Younsi, Z. (2022). Black hole images as tests of general relativity: effects of plasma physics. The Astrophysical Journal, 941(1), 88.
dc.identifier.issn0004-637X
dc.identifier.doi10.3847/1538-4357/ac9fcb
dc.identifier.urihttp://hdl.handle.net/10150/670738
dc.description.abstractThe horizon-scale images of black holes obtained with the Event Horizon Telescope have provided new probes of their metrics and tests of general relativity. The images are characterized by a bright, near-circular ring from the gravitationally lensed emission from the hot plasma and a deep central depression cast by the black hole. The metric tests rely on the fact that the bright ring closely traces the boundary of the black hole shadow with a small displacement that has been quantified using simulations. In this paper we develop a self-consistent covariant analytic model of the accretion flow that spans a broad range of plasma conditions and black hole properties to explore the general validity of this result. We show that, for any physical model of the accretion flow, the ring always encompasses the outline of the shadow and is not displaced by it by more than half the ring width. This result is a consequence of conservation laws and basic thermodynamic considerations and does not depend on the microphysics of the plasma or the details of the numerical simulations. We also present a quantitative measurement of the bias between the bright ring and the shadow radius based on the analytical models. © 2022. The Author(s). Published by the American Astronomical Society.
dc.language.isoen
dc.publisherInstitute of Physics
dc.rights© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleBlack Hole Images as Tests of General Relativity: Effects of Plasma Physics
dc.typeArticle
dc.typetext
dc.contributor.departmentDepartment of Astronomy, Steward Observatory, University of Arizona
dc.identifier.journalAstrophysical Journal
dc.description.noteOpen access journal
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
dc.eprint.versionFinal published version
dc.source.journaltitleAstrophysical Journal
refterms.dateFOA2024-01-24T05:45:42Z


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© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
Except where otherwise noted, this item's license is described as © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.