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dc.contributor.authorOrtiz-León, Gisela N.
dc.contributor.authorJohnson, Michael D.
dc.contributor.authorBlackburn, Lindy
dc.contributor.authorLoinard, Laurent
dc.contributor.authorReid, Mark J.
dc.contributor.authorCastillo, Edgar
dc.contributor.authorChael, Andrew A.
dc.contributor.authorHernández-Gómez, Antonio
dc.contributor.authorHughes, David H.
dc.contributor.authorLeón-Tavares, Jonathan
dc.contributor.authorLu, Ru-Sen
dc.contributor.authorMontaña, Alfredo
dc.contributor.authorNarayanan, Gopal
dc.contributor.authorRosenfeld, Katherine
dc.contributor.authorSánchez, David
dc.contributor.authorSchloerb, F. Peter
dc.contributor.authorShen, Zhi-qiang
dc.contributor.authorShiokawa, Hotaka
dc.contributor.authorVertatschitsch, Laura
dc.contributor.authorDoeleman, Sheperd Samuel
dc.contributor.authorFish, Vincent L.
dc.contributor.authorSooHoo, Jason G
dc.date.accessioned2016-10-26T17:58:02Z
dc.date.available2016-10-26T17:58:02Z
dc.date.issued2016-06
dc.date.submitted2016-01
dc.identifier.issn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1721.1/105095
dc.description.abstractThe radio emission from Sgr A* is thought to be powered by accretion onto a supermassive black hole of ~4 x 10⁶M⊙ at the Galactic Center. At millimeter wavelengths, Very Long Baseline Interferometry (VLBI) observations can directly resolve the bright innermost accretion region of Sgr A*. Motivated by the addition of many sensitive long baselines in the north–south direction, we developed a full VLBI capability at the Large Millimeter Telescope Alfonso Serrano (LMT). We successfully detected Sgr A* at 3.5 mm with an array consisting of six Very Long Baseline Array telescopes and the LMT. We model the source as an elliptical Gaussian brightness distribution and estimate the scattered size and orientation of the source from closure amplitude and self-calibration analysis, obtaining consistent results between methods and epochs. We then use the known scattering kernel to determine the intrinsic two-dimensional source size at 3.5 mm: (147 ∓ 7 μas) x (120 ∓ 12 μas), at position angle 88° ∓ 7° east of north. Finally, we detect non-zero closure phases on some baseline triangles, but we show that these are consistent with being introduced by refractive scattering in the interstellar medium and do not require intrinsic source asymmetry to explain.en_US
dc.description.sponsorshipConsejo Nacional de Ciencia y Tecnología (Mexico)en_US
dc.description.sponsorshipUniversidad Nacional Autónoma de México. Dirección General de Asuntos del Personal Académicoen_US
dc.description.sponsorshipGordon and Betty Moore Foundation (GBMF-3561)en_US
dc.description.sponsorshipNational Science Foundation (U.S.) (grant AST-1310896)en_US
dc.description.sponsorshipNational Science Foundation (U.S.) (AST-1211539)en_US
dc.description.sponsorshipNational Science Foundation (U.S.) (AST-1337663)en_US
dc.language.isoen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofhttp://dx.doi.org/10.3847/0004-637x/824/1/40en_US
dc.rightsArticle 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.en_US
dc.sourceAmerican Astronomical Societyen_US
dc.titleTHE INTRINSIC SHAPE OF SAGITTARIUS A* AT 3.5 mm WAVELENGTHen_US
dc.typeArticleen_US
dc.identifier.citationOrtiz-León, Gisela N., Michael D. Johnson, Sheperd S. Doeleman, Lindy Blackburn, Vincent L. Fish, Laurent Loinard, Mark J. Reid, et al. “THE INTRINSIC SHAPE OF SAGITTARIUS A* AT 3.5 Mm WAVELENGTH.” The Astrophysical Journal, vol. 824, no. 1, 40, June 2016, pp. 40. © 2016. The American Astronomical Society.en_US
dc.contributor.departmentHaystack Observatoryen_US
dc.contributor.mitauthorDoeleman, Sheperd Samuel
dc.contributor.mitauthorFish, Vincent L.
dc.contributor.mitauthorSooHoo, Jason G
dc.relation.journalAstrophysical Journalen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsOrtiz-León, Gisela N.; Johnson, Michael D.; Doeleman, Sheperd S.; Blackburn, Lindy; Fish, Vincent L.; Loinard, Laurent; Reid, Mark J.; Castillo, Edgar; Chael, Andrew A.; Hernández-Gómez, Antonio; Hughes, David H.; León-Tavares, Jonathan; Lu, Ru-Sen; Montaña, Alfredo; Narayanan, Gopal; Rosenfeld, Katherine; Sánchez, David; Schloerb, F. Peter; Shen, Zhi-qiang; Shiokawa, Hotaka; SooHoo, Jason; Vertatschitsch, Lauraen_US
dspace.embargo.termsNen_US
mit.licensePUBLISHER_POLICYen_US
mit.metadata.statusComplete


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