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A size of similar to 1 AU for the radio source Sgr A* at the centre of the Milky Way
文献类型：期刊论文
| 作者 | Shen, ZQ; Lo, KY; Liang, MC; Ho, PTP; Zhao, JH |
| 刊名 | NATURE
 |
| 出版日期 | 2005-11-03 |
| 卷号 | 438期号:7064页码:62-64 |
| 英文摘要 | Although it is widely accepted that most galaxies have supermassive black holes at their centres(1-3), concrete proof has proved elusive. Sagittarius A* (Sgr A*)(4), an extremely compact radio source at the centre of our Galaxy, is the best candidate for proof(5-7), because it is the closest. Previous very-long-baseline interferometry observations ( at 7 mm wavelength) reported that Sgr A* is similar to 2 astronomical units (AU) in size(8), but this is still larger than the 'shadow' ( a remarkably dim inner region encircled by a bright ring) that should arise from general relativistic effects near the event horizon of the black hole(9). Moreover, the measured size is wavelength dependent(10). Here we report a radio image of Sgr A* at a wavelength of 3.5 mm, demonstrating that its size is similar to 1 AU. When combined with the lower limit on its mass(11), the lower limit on the mass density is 6.5 x 10(21) M-. pc(-3) (where M-. is the solar mass), which provides strong evidence that Sgr A* is a supermassive black hole. The power-law relationship between wavelength and intrinsic size ( size proportional to wavelength(1.09)) explicitly rules out explanations other than those emission models with stratified structure, which predict a smaller emitting region observed at a shorter radio wavelength. |
| WOS标题词 | Science & Technology |
| 类目[WOS] | Multidisciplinary Sciences |
| 研究领域[WOS] | Science & Technology - Other Topics |
| 关键词[WOS] | SUPERMASSIVE BLACK-HOLE ; SAGITTARIUS-A ; GALACTIC-CENTER ; X-RAY ; NUCLEI ; MILLIMETER ; SPECTRUM ; MODELS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000232979000040 |
| 源URL | [http://119.78.226.72/handle/331011/19401]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Natl Radio Astron Observ, Charlottesville, VA 22903 USA 3.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA 4.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 5.Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan |
| 推荐引用方式 GB/T 7714 | Shen, ZQ,Lo, KY,Liang, MC,et al. A size of similar to 1 AU for the radio source Sgr A* at the centre of the Milky Way[J]. NATURE,2005,438(7064):62-64. |
| APA | Shen, ZQ,Lo, KY,Liang, MC,Ho, PTP,&Zhao, JH.(2005).A size of similar to 1 AU for the radio source Sgr A* at the centre of the Milky Way.NATURE,438(7064),62-64. |
| MLA | Shen, ZQ,et al."A size of similar to 1 AU for the radio source Sgr A* at the centre of the Milky Way".NATURE 438.7064(2005):62-64. |
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来源：上海天文台
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