View source for W49B

{{Infobox supernova
| name = W49B <br/> SNR G043.3-00.2 <br/> 3C 398
| image = [[Image:Supernova Remnant W49B in x-ray, radio, and infrared.jpg|250px]]
| caption = The nebula W49B as imaged by the [[Chandra X-Ray Observatory]] (blue) and the [[Palomar Observatory|Palomar]] {{convert|200|in|m|adj=on}} telescope (red, green)
| epoch = [[J2000.0]] 
| type = S
| SNRtype = ?
| host = 
| constellation = [[Aquila (constellation)|Aquila]]
| ra =19<sup>h</sup> 11<sup>m</sup> 09<sup>s</sup>
| dec = +09° 06' 24''
| gal = 043.275 -00.190 
| discovery =  
| iauc = 
| mag_v = ? 
| distance = 26,000 [[light-year|ly]]
| notes =   
}}

'''W49B''' (also known as '''SNR G043.3-00.2''' or '''3C 398''') is a [[nebula]] resulting from a [[Type Ib and Ic supernovae|type Ib or Ic]] [[supernova]].<ref>[http://dx.doi.org/10.1088/0004-637X/764/1/50 "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</ref> 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]]<ref>[http://www.science20.com/news_articles/w49b_did_explosion_create_our_galaxys_youngest_black_hole-103633 W49B: Did An Explosion Create Our Galaxy&#039;s Youngest Black Hole?] February 13th 2013</ref> and may have produced a [[black hole]].<ref>[http://www.newscientist.com/blogs/shortsharpscience/2013/02/youngest-black-hole.html "Baby black hole is swaddled in a supernova remnant"] by Flora Graham, [[New Scientist]] on line, Feb. 15, 2013</ref>

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]]

==References==
{{reflist}}

==External links==
* (June 2, 2004) "[http://www.spaceref.com/news/viewpr.html?pid=14325 NASA Chandra Observation of Supernova W49B Supernova Points to Ancient Gamma Ray Burst]". [http://www.spaceref.com Spaceref.com].
* (September 19, 2006) "[http://arxiv.org/abs/astro-ph/0609533 A Near-Infrared and X-ray Study of W49B: A Wind Cavity Explosion]". {{DOI|10.1086/509311}}
* [http://web.archive.org/web/19970619012400/http://www.journals.uchicago.edu/ApJ/ The Astrophysical Journal]. {{ISSN|0004-637X}} & {{ISSN|0067-0049}}
* [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%402705717&Name=SNR%20G043.3-00.2 SIMBAD: SNR G043.3-00.2 -- SuperNova Remnant] 2013.02.15 CET 18:00:16
* [<!-- http://aladin.u-strasbg.fr/AladinPreview?-c=19+11+09%2B09+06.4&ident=SNR+G043.3-00.2&submit=Aladin+previewer -->http://aladin.u-strasbg.fr/java/alapre.pl?-c=W49B Image W49B] Aladin previewer
* [http://iopscience.iop.org/0004-637X/764/1/50 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}}
[[Category:Aquila (constellation)]]
[[Category:Supernova remnants]]
[[Category:Gamma-ray bursts]]
[[Category:3C objects|398]]

{{nebula-stub}}