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Sgr A*: Observations, Models, and Imaging of the event horizon with VLBI

Published online by Cambridge University Press:  13 May 2016

Heino Falcke ,
Sera Markoff ,
Peter L. Biermann ,
Thomas P. Krichbaum ,
Fulvio Melia ,
Eric Agol  and
Geoffrey Bower
Heino Falcke
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121, Bonn, Germany
Sera Markoff
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121, Bonn, Germany
Peter L. Biermann
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121, Bonn, Germany
Thomas P. Krichbaum
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121, Bonn, Germany
Fulvio Melia
Affiliation:
Physics Department and Steward Observatory, The University of Arizona, Tucson, AZ 85721
Eric Agol
Affiliation:
Theoretical Astrophysics, Caltech MS 130-33, 1200 E. California Blvd., Pasadena, CA 91125
Geoffrey Bower
Affiliation:
Radio Astronomy Laboratory, University of California, Berkeley, CA 94720

Abstract

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We show and discuss results and prospects of high-resolution imaging of the supermassive black hole candidate Sgr A*. We also briefly review the latest observational and theoretical progress for this source. The latest millimeter-VLBI observations show compact radio emission from within a region of about 15 Schwarzschild radii. This compact component is most likely responsible for the so-called sub-mm bump in the spectrum and perhaps even for the recently discovered circular polarization discovered up to 43 GHz and some X-ray emission through synchrotron self-Compton emission. Most importantly, however, the sub-mm emission from Sgr A* opens the door to observe, for the first time, the event horizon of a black hole directly with VLBI at sub-mm wavelengths.

Type
The Inner Regions of Galaxies
Information
Symposium - International Astronomical Union , Volume 205: Galaxies and their Constituents at the Highest Angular Resolutions , 2001 , pp. 28 - 31
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

Aitken, D. K., Greaves, J., Chrysostomou, A., et al. 2000, ApJ, 534, L173.Google Scholar
Backer, D. C., & Sramek, R. A. 1999, ApJ, 524, 805.Google Scholar
Baganoff, F., et al., L. 2000, ApJ, submitted.Google Scholar
Beckert, T., & Duschl, W. J. 1997, A&A, 328, 95.Google Scholar
Bower, G. C. 2000, GCNEWS, 11, 4.Google Scholar
Bower, G. C., Falcke, H., & Backer, D. C. 1999, ApJ, 523, L29.Google Scholar
Cash, W., Shipley, A., Osterman, S., & Jay, M. 2000, Nature, 407, 160.CrossRefGoogle Scholar
Doeleman, S., Shen, Z.-Q., Rogers, A. E. E., et al. 2000, ApJ, submitted.Google Scholar
Eckart, A., & Genzel, R. 1997, MNRAS, 284, 576.Google Scholar
Falcke, H., Goss, W. M., Matsuo, H., et al. 1998, ApJ, 499, 731.Google Scholar
Falcke, H., Mannheim, K., & Biermann, P. L. 1993, A&A, 278, L1.Google Scholar
Falcke, H., & Markoff, S. 2000, A&A, 362, 113.Google Scholar
Falcke, H., Melia, F., & Agol, E. 2000, ApJ, 528, L13.Google Scholar
Ghez, A. M., Klein, B. L., Morris, M., & Becklin, E. E. 1998, ApJ, 509, 678.Google Scholar
Krichbaum, T. P., Graham, D. A., Witzel, A., et al. 1998, A&A, 335, L106.Google Scholar
Melia, F. 1992, ApJ, 387, L25.Google Scholar
Melia, F., & Falcke, H. 2001, ARA&A, 39, submitted.Google Scholar
Melia, F., Liu, S., & Coker, R. 2000, ApJ Letters, in press.Google Scholar
Narayan, R., Mahadevan, R., Grindlay, J. E., et al. 1998, ApJ, 492, 554.Google Scholar
Rantakyro, F. T., et al. 1998, A&AS, 131, 451.Google Scholar
Reid, M. J., Readhead, A. C. S., Vermeulen, R. C., et al. 1999, ApJ, 524, 816.Google Scholar
Wardle, J. F. C., & Homan, D. C. 2000, in “Particles and Fields in Radio Galaxies”, ASP Conference Series, in press.Google Scholar