An Approach Detecting the Event Horizon of SgrA Abstract
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ALMA MEMO #499
An Approach Detecting the Event Horizon of SgrA*
Makoto Miyoshi, Seiji Kameno, Jose K. Ishitsuka
(National Astronomical Observatory, Mitaka, Tokyo, Japan)
Zhi-Qiang Shen
(Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai)
Rohta Takahashi
(Yukawa Institute for Theoretical Physics, Kyoto University, Japan)
Shinji Horiuchi
(Center for Astrophysics and Supercomputing, Swinburne University of Technology,Victoria, Australia)
2004-05-20
Keywords: black hole, event horizon, SgrA*, submillimeter VLBIImaging the vicinity of a black hole is one of the ultimate goals of VLBI astronomy. The closest massive black hole, SgrA*, located at the Galactic center is the leading candidate for such observations. Combined with recent VLBI recording technique and submillimeter radio engineering, we now have the sufficient sensitivity for the observations. Here we show performance simulations of submillimeter VLBI arrays for imaging SgrA*. Good images are obtained from submillimeter VLBI arrays in the southern hemisphere composed of more than 10 stations. We also note that even with a small array, we can estimate the shadow size and then the mass of black hole from visibility analysis. Now, all we need is to construct a submillimeter VLBI array in the southern hemisphere if we wish to unveil the black hole environment of SgrA*.
View a pdf version of ALMA Memo #499.
