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PhysRevD.102.044017.pdf
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281.4Kb
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Final Published Version
Author
Gralla, Samuel E.Affiliation
Univ Arizona, Dept PhysIssue Date
2020-08
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AMER PHYSICAL SOCCitation
Gralla, S. E. (2020). Measuring the shape of a black hole photon ring. Physical Review D, 102(4), 044017.Journal
PHYSICAL REVIEW DRights
© 2020 American Physical Society.Collection Information
This 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.Abstract
General relativity predicts that gravitational lensing near black holes will produce narrow "photon rings" on images. Building on recent work of Johnson, Lupsasca et al. focusing on circular rings, I calculate the long-baseline interferometric signature of a narrow feature of arbitrary shape and intensity. The shape information is contained in the oscillation frequencies of the complex visibility as a function of baseline length, for each baseline angle. These results raise the possibility of measuring the detailed shape of a photon ring and comparing to the precise predictions of general relativity.Note
Immediate accessISSN
1550-7998EISSN
1550-2368Version
Final published versionae974a485f413a2113503eed53cd6c53
10.1103/PhysRevD.102.044017