W49B

W49B SNR G043.3-00.2 3C 398
250px The nebula W49B as imaged by the Chandra X-Ray Observatory (blue) and the Palomar 200-inch (5.1 m) telescope (red, green)
Observation data (Epoch J2000.0)
Supernova type	S
Remnant type	?
Constellation	Aquila
Right ascension	19h 11m 09s
Declination	+09° 06' 24
Galactic coordinates	043.275 -00.190
Peak magnitude (V)	?
Distance	26,000 ly

W49B (also known as SNR G043.3-00.2 or 3C 398) is a nebula resulting from a type Ib or Ic supernova. 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 and may have produced a black hole.

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

External links

• (June 2, 2004) "NASA Chandra Observation of Supernova W49B Supernova Points to Ancient Gamma Ray Burst". Spaceref.com.
• (September 19, 2006) "A Near-Infrared and X-ray Study of W49B: A Wind Cavity Explosion". doi:10.1086/509311
• The Astrophysical Journal. ISSN 0004-637X & ISSN 0067-0049
• SIMBAD: SNR G043.3-00.2 -- SuperNova Remnant 2013.02.15 CET 18:00:16
• Image W49B Aladin previewer
• The Galactic Supernova Remnant W49B Likely Originates from a Jet-driven, Core-collapse Explosion - Abstract - The Astrophysical Journal - IOPscience, Issue 1 (2013 February 10) doi:10.1088/0004-637X/764/1/50