Detection of Intrinsic Source Structure at similar to 3 Schwarzschild Radii with Millimeter-VLBI Observations of SAGITTARIUS A*

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Lu, Ru-SenMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Massachusetts Institute of Technology (MIT) (author)

Detection of Intrinsic Source Structure at similar to 3 Schwarzschild Radii with Millimeter-VLBI Observations of SAGITTARIUS A*

Article/chapterEnglish2018

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2018-05-24
American Astronomical Society,2018
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LIBRIS-ID:oai:research.chalmers.se:8761b07e-3376-43f3-9cc2-10685677ad2d
https://doi.org/10.3847/1538-4357/aabe2eDOI
https://research.chalmers.se/publication/503593URI
https://research.chalmers.se/publication/503623URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:art swepub-publicationtype
Subject category:ref swepub-contenttype

Notes

We report results from very long baseline interferometric (VLBI) observations of the supermassive black hole in the Galactic center, Sgr A*, at 1.3 mm (230 GHz). The observations were performed in 2013 March using six VLBI stations in Hawaii, California, Arizona, and Chile. Compared to earlier observations, the addition of the APEX telescope in Chile almost doubles the longest baseline length in the array, provides additional uv coverage in the N-S direction, and leads to a spatial resolution of similar to 30 mu as (similar to 3 Schwarzschild radii) for Sgr A*. The source is detected even at the longest baselines with visibility amplitudes of similar to 4%-13% of the total flux density. We argue that such flux densities cannot result from interstellar refractive scattering alone, but indicate the presence of compact intrinsic source structure on scales of similar to 3 Schwarzschild radii. The measured nonzero closure phases rule out point-symmetric emission. We discuss our results in the context of simple geometric models that capture the basic characteristics and brightness distributions of disk-and jet-dominated models and show that both can reproduce the observed data. Common to these models are the brightness asymmetry, the orientation, and characteristic sizes, which are comparable to the expected size of the black hole shadow. Future 1.3 mm VLBI observations with an expanded array and better sensitivity will allow more detailed imaging of the horizon-scale structure and bear the potential for a deep insight into the physical processes at the black hole boundary.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Meteorologi och atmosfärforskning hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Meteorology and Atmospheric Sciences hsv//eng
NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
NATURVETENSKAP Fysik Annan fysik hsv//swe
NATURAL SCIENCES Physical Sciences Other Physics Topics hsv//eng
Galaxy: center
techniques: interferometric
techniques: high angular resolution
submillimeter: general

Added entries (persons, corporate bodies, meetings, titles ...)

Krichbaum, Thomas P.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Roy, Alan L.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Fish, Vincent L.Massachusetts Institute of Technology (MIT) (author)
Doeleman, Sheperd S.Harvard-Smithsonian Center for Astrophysics,Massachusetts Institute of Technology (MIT) (author)
Johnson, Michael D.Harvard-Smithsonian Center for Astrophysics (author)
Akiyama, KazunoriUniversity of Tokyo, Japan,National Astronomical Observatory of Japan,Massachusetts Institute of Technology (MIT) (author)
Psaltis, DimitriosUniversity of Arizona (author)
Alef, WalterMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Asada, KeiichiAcademia Sinica Taiwan (author)
Beaudoin, ChristopherMassachusetts Institute of Technology (MIT) (author)
Bertarini, AlessandraUniversität Bonn,University of Bonn,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Blackburn, LindyHarvard-Smithsonian Center for Astrophysics (author)
Blundell, RayHarvard-Smithsonian Center for Astrophysics (author)
Bower, Geoffrey C.Academia Sinica Taiwan (author)
Brinkerink, ChristiaanRadboud Universiteit,Radboud University (author)
Broderick, Avery E.University of Waterloo,Perimeter Institute for Theoretical Physics (author)
Cappallo, RogerMassachusetts Institute of Technology (MIT) (author)
Crew, Geoffrey B.Massachusetts Institute of Technology (MIT) (author)
Dexter, JasonMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Dexter, MattUniversity of California (author)
Falcke, HeinoRadboud Universiteit,Radboud University,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Netherlands Institute for Radio Astronomy (ASTRON) (author)
Freund, RobertUniversity of Arizona (author)
Friberg, PerEast Asian Observatory (author)
Greer, Christopher H.University of Arizona (author)
Gurwell, Mark A.Harvard-Smithsonian Center for Astrophysics (author)
Ho, Paul T. P.Academia Sinica Taiwan (author)
Honma, MarekiThe Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan (author)
Inoue, MakotoAcademia Sinica Taiwan (author)
Kim, JunhanUniversity of Arizona (author)
Lamb, JamesCalifornia Institute of Technology (Caltech) (author)
Lindqvist, Michael,1960Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mlq (author)
Macmahon, DavidUniversity of California (author)
Marrone, Daniel P.University of Arizona (author)
Marti-Vidal, Ivan,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mivan (author)
Menten, Karl M.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Moran, James M.Harvard-Smithsonian Center for Astrophysics (author)
Nagar, Neil M.Universidad de Concepción,University of Concepcion (author)
Plambeck, Richard L.University of California (author)
Primiani, Rurik A.Harvard-Smithsonian Center for Astrophysics (author)
Rogers, Alan E. E.Massachusetts Institute of Technology (MIT) (author)
Ros, EduardoMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Universitat de Valencia (author)
Rottmann, HelgeMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
SooHoo, JasonMassachusetts Institute of Technology (MIT) (author)
Spilker, JustinThe University of Texas at Austin, USA,University of Arizona (author)
Stone, JordanUniversity of Arizona (author)
Strittmatter, PeterUniversity of Arizona (author)
Tilanus, Remo P. J.Radboud Universiteit,Radboud University,Universiteit Leiden (UL),Leiden University (UL) (author)
Titus, MichaelMassachusetts Institute of Technology (MIT) (author)
Vertatschitsch, LauraHarvard-Smithsonian Center for Astrophysics (author)
Wagner, JanKorea Astronomy and Space Science Institute,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Weintroub, JonathanHarvard-Smithsonian Center for Astrophysics (author)
Wright, MelvynUniversity of California (author)
Young, Ken H.Harvard-Smithsonian Center for Astrophysics (author)
Zensus, J. AntonMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Ziurys, Lucy M.University of Arizona (author)
Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG)Massachusetts Institute of Technology (MIT) (creator_code:org_t)

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In:Astrophysical Journal: American Astronomical Society859:11538-43570004-637X

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By the author/editor: Lu, Ru-Sen; Krichbaum, Thoma ...; Roy, Alan L.; Fish, Vincent L.; Doeleman, Sheper ...; Johnson, Michael ...; show more...; Akiyama, Kazunor ...; Psaltis, Dimitri ...; Alef, Walter; Asada, Keiichi; Beaudoin, Christ ...; Bertarini, Aless ...; Blackburn, Lindy; Blundell, Ray; Bower, Geoffrey ...; Brinkerink, Chri ...; Broderick, Avery ...; Cappallo, Roger; Crew, Geoffrey B ...; Dexter, Jason; Dexter, Matt; Falcke, Heino; Freund, Robert; Friberg, Per; Greer, Christoph ...; Gurwell, Mark A.; Ho, Paul T. P.; Honma, Mareki; Inoue, Makoto; Kim, Junhan; Lamb, James; Lindqvist, Micha ...; Macmahon, David; Marrone, Daniel ...; Marti-Vidal, Iva ...; Menten, Karl M.; Moran, James M.; Nagar, Neil M.; Plambeck, Richar ...; Primiani, Rurik ...; Rogers, Alan E. ...; Ros, Eduardo; Rottmann, Helge; SooHoo, Jason; Spilker, Justin; Stone, Jordan; Strittmatter, Pe ...; Tilanus, Remo P. ...; Titus, Michael; Vertatschitsch, ...; Wagner, Jan; Weintroub, Jonat ...; Wright, Melvyn; Young, Ken H.; Zensus, J. Anton; Ziurys, Lucy M.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Meteorology and ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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