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An Approach Detecting the Event Horizon of Sgr A*
Makoto Miyoshi, Seiji Kameno, Jose K. Ishituka +3
Imaging the vicinity of a black hole is one of the ultimate goals of VLBI astronomy. The closest massive black hole, Sgr A*, located at the Galactic center, is the leading candidat…
VLBI Observations of SiO Masers around AH Scorpii
Xi Chen, Zhi-Qiang Shen
We report the first Very Long Baseline Array (VLBA) observations of 43 GHz v=1, J=1-0 SiO masers in the circumstellar envelope of the M-type semi-regular supergiant variable star A…
A Modified Synchrotron Model for Knots in the M87 Jet
Wen-Po Liu, Zhi-Qiang Shen
For explaining the broadband spectral shape of knots in the M87 jet from radio through optical to X-ray, we propose a modified synchrotron model that considers the integrated effec…
Black Hole Shadow Image and Visibility Analysis of Sagittarius A*
Lei Huang, Mike Cai, Zhi-Qiang Shen +1
The compact dark objects with very large masses residing at the centres of galaxies are believed to be black holes. Due to the gravitational lensing effect, they would cast a shado…
Phase-reference VLBI Observations of the Compact Steep-Spectrum Source 3C 138
Zhi-Qiang Shen, L. -L. Shang, D. -R. jiang +2
We investigate a phase-reference VLBI observation that was conducted at 15.4 GHz by fast switching VLBA antennas between the compact steep-spectrum radio source 3C 138 and the quas…
High-resolution Millimeter-VLBI Imaging of Sgr A*
Zhi-Qiang Shen
We present the highest resolution VLBI imaging observations of Sgr A* made at both 7 and 3.5 mm. These data reveal wavelength-dependent intrinsic sizes with an intrinsic emitting r…