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V4641 Sagittarii : ウィキペディア英語版 | V4641 Sagittarii
V4641 Sagittarii (V4641 Sgr) is a variable X-ray binary star system in the constellation Sagittarius. It is the source of one of the fastest superluminal jets in our galaxy. In 1999 a violent X-ray outburst revealed it to contain a black hole.〔(【引用サイトリンク】url=http://www.nrao.edu/pr/2000/v4641/ )〕 At the time, it was considered to be the closest known black hole to Earth, at a distance of approximately . Later observations showed it to be at least 15 times farther away.〔(A Black Hole in the Superluminal Source SAX J1819.3-2525 (V4641 SGR) ), 2001: "Finally, we find a distance in the range 7.40 ≤ d ≤ 12.31 kpc (90% confidence), which is at least a factor of ≈ 15 larger than the initially assumed distance of ≈ 1,600 light-years/500 pc."〕 ==References==
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