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dc.contributor.authorDoeleman, Sheperd S.
dc.contributor.authorFish, Vincent L.
dc.contributor.authorBroderick, Avery E.
dc.contributor.authorLoeb, Abraham
dc.contributor.authorRogers, Alan E. E.
dc.date.accessioned2019-09-24T12:05:05Z
dc.date.issued2009
dc.identifier.citationDoeleman, Sheperd S., Vincent L. Fish, Avery E. Broderick, Abraham Loeb, and Alan E. E. Rogers. 2009. “DETECTING FLARING STRUCTURES IN SAGITTARIUS A* WITH HIGH-FREQUENCY VLBI.” The Astrophysical Journal 695 (1): 59–74. https://doi.org/10.1088/0004-637x/695/1/59.
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41393464*
dc.description.abstractThe super-massive black hole candidate, Sagittarius A*, exhibits variability from radio to X-ray wavelengths on timescales that correspond to < 10 Schwarzschild radii. We survey the potential of millimeter wavelength very long baseline interferometry (VLBI) to detect and constrain time-variable structures that could give rise to such variations, focusing on a model in which an orbiting hot spot is embedded in an accretion disk. Nonimaging algorithms are developed that use interferometric closure quantities to test for periodicity, and applied to an ensemble of hot spot models that sample a range of parameter space. We find that structural periodicity in a wide range of cases can be detected on most potential VLBI arrays using modern VLBI instrumentation. Future enhancements of millimeter/submillimeter VLBI arrays including phased-array processors to aggregate VLBI station collecting area, increased bandwidth recording, and addition of new VLBI sites all significantly aid periodicity detection. The methods described herein can be applied to other models of Sagittarius A*, including jet outflows and magnetohydrodynamic accretion simulations.
dc.language.isoen_US
dc.publisherAmerican Astronomical Society
dash.licenseLAA
dc.titleDetecting Flaring Structures in Sagittarius A* With High-frequency Vlbi
dc.typeJournal Article
dc.description.versionVersion of Record
dc.relation.journalThe Astrophysical Journal
dash.depositing.authorLoeb, Abraham::9975df1f269ab49c1ad5a328a1ec1476::600
dc.date.available2019-09-24T12:05:05Z
dash.workflow.comments1Science Serial ID 98088
dc.identifier.doi10.1088/0004-637X/695/1/59
dash.source.volume695;1
dash.source.page59-74


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