Detection of the intrinsic size of Sagittarius A* through closure amplitude imaging

被引：167
作者：
Bower, GC
Falcke, H
Herrnstein, RM
Zhao, JH
Goss, WM
Backer, DC
机构：
[1] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Radio Astron Lab, Berkeley, CA 94720 USA
[3] ASTRON, Radio Observ Westerbork, NL-7990 AA Dwingeloo, Netherlands
[4] Univ Nijmegen, Dept Astron, NL-6500 GL Nijmegen, Netherlands
[5] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[6] Columbia Univ, Dept Astron, New York, NY 10027 USA
[7] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[8] Natl Radio Astron Observ, Array Operat Ctr, Socorro, NM 87801 USA
来源：
SCIENCE | 2004年 / 304卷 / 5671期
关键词：
D O I：
10.1126/science.1094023
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
We have detected the intrinsic size of Sagittarius A*, the Galactic center radio source associated with a supermassive black hole, showing that the short-wavelength radio emission arises from very near the event horizon of the black hole. Radio observations with the Very Long Baseline Array show that the source has a size of 24 +/- 2 Schwarzschild radii at 7-millimeter wavelength. In one of eight 7-millimeter epochs, we also detected an increase in the intrinsic size of 60(-17)(+25)%. These observations place a lower limit to the mass density of Sagittarius A* of 1.4 x 10(4) solar masses per cubic astronomical unit.
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收藏
页码：704 / 708
页数：5
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