Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..968..340s&link_type=abstract
ASTROPHYSICS OF COMPACT OBJECTS: International Conference on Astrophysics of Compact Objects. AIP Conference Proceedings, Volum
Astronomy and Astrophysics
Astrophysics
1
Galactic Center, Bar, Circumnuclear Matter, And Bulge, Black Holes, Radio, Microwave, Interferometry
Scientific paper
The nonthermal radio source Sgr A* at the Galactic center has been known to be extremely compact since its discovery. Following a brief introduction to its size measurements (including its discovery, interstellar scattering effect and its elongated structure), we describe the detection of an intrinsic size of only 1 AU for Sgr A*. When combined with the mass estimate of Sgr A*, these size measurements provide strong evidence that Sgr A* is a super-massive black hole. Results from the simulation of the black hole shadow image and the corresponding visibility analysis indicate that future sub-millimeter VLBI experiments are critical and promising to probe the Galactic center black hole. High quality multi-epoch radio interferometric images of Sgr A* with a wavelength coverage from long centimeter to short millimeter are needed in order to pursue the two-dimensional structure for the scattering angle and the intrinsic source structure, and the corresponding size variation.
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