[asac][almanews] ALMA Memo 499 Released

[Stacy Oliver]

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 VLBI

 

Imaging 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. 

http://www.alma.nrao.edu/memos/html-memos/alma499/memo499.pdf

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