Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre

Sheperd S. Doeleman (), Jonathan Weintroub, Alan E. E. Rogers, Richard Plambeck, Robert Freund, Remo P. J. Tilanus, Per Friberg, Lucy M. Ziurys, James M. Moran, Brian Corey, Ken H. Young, Daniel L. Smythe, Michael Titus, Daniel P. Marrone, Roger J. Cappallo, Douglas C.-J. Bock, Geoffrey C. Bower, Richard Chamberlin, Gary R. Davis, Thomas P. Krichbaum, James Lamb, Holly Maness, Arthur E. Niell, Alan Roy, Peter Strittmatter, Daniel Werthimer, Alan R. Whitney and David Woody
Additional contact information
Sheperd S. Doeleman: Massachusetts Institute of Technology (MIT) Haystack Observatory, Off Route 40, Westford, Massachusetts 01886, USA
Jonathan Weintroub: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Alan E. E. Rogers: Massachusetts Institute of Technology (MIT) Haystack Observatory, Off Route 40, Westford, Massachusetts 01886, USA
Richard Plambeck: University of California Berkeley, 601 Campbell, Berkeley, California 94720-3411 USA
Robert Freund: Arizona Radio Observatory, Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson Arizona 85721-0065, USA
Remo P. J. Tilanus: James Clerk Maxwell Telescope, Joint Astronomy Centre, 660 North A’ohoku Place University Park, Hilo, Hawaii 96720, USA
Per Friberg: James Clerk Maxwell Telescope, Joint Astronomy Centre, 660 North A’ohoku Place University Park, Hilo, Hawaii 96720, USA
Lucy M. Ziurys: Arizona Radio Observatory, Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson Arizona 85721-0065, USA
James M. Moran: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Brian Corey: Massachusetts Institute of Technology (MIT) Haystack Observatory, Off Route 40, Westford, Massachusetts 01886, USA
Ken H. Young: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Daniel L. Smythe: Massachusetts Institute of Technology (MIT) Haystack Observatory, Off Route 40, Westford, Massachusetts 01886, USA
Michael Titus: Massachusetts Institute of Technology (MIT) Haystack Observatory, Off Route 40, Westford, Massachusetts 01886, USA
Daniel P. Marrone: National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, Virginia 22903-2475, USA
Roger J. Cappallo: Massachusetts Institute of Technology (MIT) Haystack Observatory, Off Route 40, Westford, Massachusetts 01886, USA
Douglas C.-J. Bock: CARMA, PO Box 968, Big Pine, California 93513-0968, USA
Geoffrey C. Bower: University of California Berkeley, 601 Campbell, Berkeley, California 94720-3411 USA
Richard Chamberlin: Caltech Submillimeter Observatory, 111 Nowelo Street, Hilo, Hawai’i 96720, USA
Gary R. Davis: James Clerk Maxwell Telescope, Joint Astronomy Centre, 660 North A’ohoku Place University Park, Hilo, Hawaii 96720, USA
Thomas P. Krichbaum: Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
James Lamb: OVRO, California Institute of Technology, 100 Leighton Lane, Big Pine, California 93513-0968, USA
Holly Maness: University of California Berkeley, 601 Campbell, Berkeley, California 94720-3411 USA
Arthur E. Niell: Massachusetts Institute of Technology (MIT) Haystack Observatory, Off Route 40, Westford, Massachusetts 01886, USA
Alan Roy: Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Peter Strittmatter: Arizona Radio Observatory, Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson Arizona 85721-0065, USA
Daniel Werthimer: University of California Berkeley, Space Sciences Laboratory, Berkeley, California 94720-7450, USA
Alan R. Whitney: Massachusetts Institute of Technology (MIT) Haystack Observatory, Off Route 40, Westford, Massachusetts 01886, USA
David Woody: OVRO, California Institute of Technology, 100 Leighton Lane, Big Pine, California 93513-0968, USA

Nature, 2008, vol. 455, issue 7209, 78-80

Abstract: Black hole physics: A new window on the Galactic Centre Using Very Long Baseline Interferometry (VLBI) at the relatively short radio wavelength of 1.3 mm, a new intrinsic size estimate has been obtained for Sagittarius A*, the supermassive black hole candidate at the centre of the Milky Way. The resulting lower limit on the size of Sgr A* is less than the predicted size of the event horizon of the presumed black hole, suggesting that Sgr A* emissions centre not on the black hole itself but on the surrounding accretion flow. VLBI observations of the Galactic Centre at around 1.3 mm, less influenced by interstellar scattering than those made at longer wavelengths, open a new window onto black-hole physics that will become even more sensitive as new VLBI stations are built.

Date: 2008
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DOI: 10.1038/nature07245

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