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W49B (also known as SNR G043.3-00.2 or 3C 398) is a nebula resulting from a type Ib or Ic supernova.〔("The Galactic Supernova Remnant W49B Likely Originates from a Jet-driven, Core-collapse Explosion" ) by Laura A. Lopez et al. 2013 Astrophysical Journal 764 50〕 If the supernova was visible from Earth it would have been seen around 1000 AD (the remnant "is about a thousand years old") which may have produced a gamma-ray burst〔(W49B: Did An Explosion Create Our Galaxy's Youngest Black Hole? ) February 13th 2013〕 and may have produced a black hole.〔("Baby black hole is swaddled in a supernova remnant" ) by Flora Graham, New Scientist on line, Feb. 15, 2013〕 W49B is barrel-shaped and located roughly 26,000 light-years from Earth. Recent findings indicate infrared "rings" (about 25 light-years in diameter) around the "barrel", and also indicate intense X-ray radiation coming from nickel and iron along its axis. The star that created this nebula is thought to have formed from a dense dust cloud before throwing off hot, gaseous rings, creating a bubble, and exploding. ==See also== * Westerhout 49 (W49) * Black hole * List of supernova remnants 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「W49B」の詳細全文を読む スポンサード リンク
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