Sangam: A Confluence of Knowledge Streams

1.3 mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES

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dc.contributor Haystack Observatory
dc.contributor Fish, Vincent L.
dc.contributor Doeleman, Sheperd Samuel
dc.contributor Beaudoin, Christopher J.
dc.contributor Bolin, David E.
dc.contributor Smythe, Daniel L.
dc.contributor SooHoo, Jason G.
dc.contributor Titus, Michael A.
dc.creator Fish, Vincent L.
dc.creator Doeleman, Sheperd Samuel
dc.creator Beaudoin, Christopher J.
dc.creator Blundell, Ray
dc.creator Bolin, David E.
dc.creator Bower, Geoffrey C.
dc.creator Chamberlin, Richard
dc.creator Freund, Robert
dc.creator Friberg, Per
dc.creator Gurwell, Mark A.
dc.creator Honma, Mareki
dc.creator Inoue, Makoto
dc.creator Krichbaum, Thomas P.
dc.creator Lamb, James
dc.creator Marrone, Daniel P.
dc.creator Moran, James M.
dc.creator Oyama, Tomoaki
dc.creator Plambeck, Richard
dc.creator Primiani, Rurik
dc.creator Rogers, Alan E. E.
dc.creator Smythe, Daniel L.
dc.creator SooHoo, Jason G.
dc.creator Strittmatter, Peter
dc.creator Tilanus, Remo P. J.
dc.creator Titus, Michael A.
dc.creator Weintroub, Jonathan
dc.creator Wright, Melvyn
dc.creator Woody, David
dc.creator Young, Ken H.
dc.creator Ziurys, Lucy M.
dc.date 2015-03-12T19:08:28Z
dc.date 2015-03-12T19:08:28Z
dc.date 2011-02
dc.date 2010-11
dc.identifier 2041-8205
dc.identifier 2041-8213
dc.identifier http://hdl.handle.net/1721.1/95995
dc.identifier Fish, Vincent L., Sheperd S. Doeleman, Christopher Beaudoin, Ray Blundell, David E. Bolin, Geoffrey C. Bower, Richard Chamberlin, et al. “1.3 Mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES.” The Astrophysical Journal 727, no. 2 (January 10, 2011): L36. © 2011 American Astronomical Society.
dc.description Sagittarius A*, the ~4 × 10[superscript 6] 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*.
dc.description National Science Foundation (U.S.) (NSF Research Experiences for Undergraduates program)
dc.description Academia Sinica (Beijing, China)
dc.description Smithsonian Institution
dc.format application/pdf
dc.language en_US
dc.publisher Institute of Physics/American Astronomical Society
dc.relation http://dx.doi.org/10.1088/2041-8205/727/2/l36
dc.relation Astrophysical Journal
dc.rights Article 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.
dc.source American Astronomical Society
dc.title 1.3 mm WAVELENGTH VLBI OF SAGITTARIUS A*: DETECTION OF TIME-VARIABLE EMISSION ON EVENT HORIZON SCALES
dc.type Article
dc.type http://purl.org/eprint/type/JournalArticle


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