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dc.contributor.authorFish, Vincent L.
dc.contributor.authorDoeleman, Sheperd Samuel
dc.contributor.authorBeaudoin, Christopher
dc.contributor.authorBlundell, Raymond
dc.contributor.authorBolin, David E.
dc.contributor.authorBower, Geoffrey C.
dc.contributor.authorChamberlin, Richard
dc.contributor.authorFreund, Robert
dc.contributor.authorFriberg, Per
dc.contributor.authorGurwell, Mark Andrew
dc.contributor.authorHonma, Mareki
dc.contributor.authorInoue, Makoto
dc.contributor.authorKrichbaum, Thomas P.
dc.contributor.authorLamb, James
dc.contributor.authorMarrone, Daniel P.
dc.contributor.authorMoran, James M.
dc.contributor.authorOyama, Tomoaki
dc.contributor.authorPlambeck, Richard
dc.contributor.authorPrimiani, Rurik A.
dc.contributor.authorRogers, Alan E. E.
dc.contributor.authorSmythe, Daniel L.
dc.contributor.authorSooHoo, Jason
dc.contributor.authorStrittmatter, Peter
dc.contributor.authorTilanus, Remo P. J.
dc.contributor.authorTitus, Michael
dc.contributor.authorWeintroub, Jonathan
dc.contributor.authorWright, Melvyn
dc.contributor.authorWoody, David
dc.contributor.authorYoung, Ken Harbour
dc.contributor.authorZiurys, Lucy M.
dc.date.accessioned2017-04-06T19:04:59Z
dc.date.issued2011
dc.identifierQuick submit: 2017-02-27T20:50:56-0500
dc.identifier.citationFish, Vincent L., Sheperd S. Doeleman, Christopher Beaudoin, Ray Blundell, David E. Bolin, Geoffrey C. Bower, Richard Chamberlin, et al. 2011. “1.3 mm Wavelength VLBI of Sagittarius A*: Detection of Time-Variable Emission on Event Horizon Scales.” The Astrophysical Journal 727 (2) (January 10): L36. doi:10.1088/2041-8205/727/2/l36.en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:32086436
dc.description.abstractSagittarius A*, the ~4 × 106 M ☉ black hole candidate at the Galactic center, can be studied on Schwarzschild radius scales with (sub)millimeter wavelength very long baseline interferometry (VLBI). We report on 1.3 mm wavelength observations of Sgr A* using a VLBI array consisting of the JCMT on Mauna Kea, the Arizona Radio Observatory's Submillimeter Telescope on Mt. Graham in Arizona, and two telescopes of the CARMA array at Cedar Flat in California. Both Sgr A* and the quasar calibrator 1924–292 were observed over three consecutive nights, and both sources were clearly detected on all baselines. For the first time, we are able to extract 1.3 mm VLBI interferometer phase information on Sgr A* through measurement of closure phase on the triangle of baselines. On the third night of observing, the correlated flux density of Sgr A* on all VLBI baselines increased relative to the first two nights, providing strong evidence for time-variable change on scales of a few Schwarzschild radii. These results suggest that future VLBI observations with greater sensitivity and additional baselines will play a valuable role in determining the structure of emission near the event horizon of Sgr A*.en_US
dc.description.sponsorshipAstronomyen_US
dc.language.isoen_USen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionof10.1088/2041-8205/727/2/l36en_US
dc.relation.hasversionhttps://arxiv.org/abs/1011.2472en_US
dash.licenseOAP
dc.subjectGalaxy: centeren_US
dc.subjectsubmillimeter: generalen_US
dc.subjecttechniques: high angular resolutionen_US
dc.subjecttechniques: interferometricen_US
dc.title1.3 mm Wavelength VLBI of Sagittarius A*: Detection of Time-Variable Emission on Event Horizon Scalesen_US
dc.typeJournal Articleen_US
dc.date.updated2017-02-28T01:50:57Z
dc.description.versionAccepted Manuscripten_US
dc.relation.journalThe Astrophysical Journalen_US
dash.depositing.authorMoran, James M.
dc.date.available2011
dc.date.available2017-04-06T19:04:59Z
dc.identifier.doi10.1088/2041-8205/727/2/l36*
dash.authorsorderedfalse
dash.contributor.affiliatedDoeleman, Sheperd
dash.contributor.affiliatedPrimiani, Rurik
dash.contributor.affiliatedGurwell, Mark
dash.contributor.affiliatedYoung, Ken
dash.contributor.affiliatedBlundell, Raymond
dash.contributor.affiliatedWeintroub, Jonathan
dash.contributor.affiliatedMoran, James


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