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RCW 86 (Supernova Remnant)


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RCW 86
Supernova Remnant (超新星残骸)
SNR

別名 (Other names)
SN 185

星座 (Constellation)

コンパス座 (Cir) (Circinus)

ケンタウルス座 (Cen) (Centaurus)

距離 (Distance)
8,200光年 (8,200 light-years)

SN 185(エスエヌ185)は、ケンタウルス座で185年12月7日に観測された超新星。
超新星残骸はHII領域RCW 86およびX線天体ケンタウルス座X-1 (Cen X-1) です。
天球上での位置はケンタウルス座アルファ星のそばで、コンパス座との境界に近い。

中国の天文学者が客星として観測した記録が歴史書『後漢書』に残っており、記録が見つかっている最古の超新星です。RCW 86と位置が一致していたが、RCW 86の年代推定が約1万年とずれがあったため、同定には疑問が残っていた。しかし、2006年、X線天文学衛星XMM-Newtonとチャンドラのデータをもとにした研究により、2000年という一致した年代が得られ、現在ではこの同定が広く受け入れられている。

RCW 86 is a supernova remnant located 8,200 light years from the Earth in the constellation Centaurus.

RCW 86 (Supernova Remnant) : Picture

RCW 86: Historical Supernova Remnant
RCW 86: Historical Supernova Remnant
(C) X-ray: XMM-Newton, Chandra / IR: WISE, Spitzer
In 185 AD, Chinese astronomers recorded the appearance of a new star in the Nanmen asterism - a part of the sky identified with Alpha and Beta Centauri on modern star charts. The new star was visible for months and is thought to be the earliest recorded supernova. This multiwavelength composite image from orbiting telescopes of the 21st century, XMM-Newton and Chandra in X-rays, and Spitzer and WISE in infrared, shows RCW 86, understood to be the remnant of that stellar explosion. The false-color view traces interstellar gas heated by the expanding supernova shock wave at X-ray energies (blue and green) and interstellar dust radiating at cooler temperatures in infrared light (yellow and red). An abundance of the element iron and lack of a neutron star or pulsar in the remnant suggest that the original supernova was Type Ia. Type Ia supernovae are thermonuclear explosions that destroy a white dwarf star as it accretes material from a companion in a binary star system. Shock velocities measured in the X-ray emitting shell and infrared dust temperatures indicate that the remnant is expanding extremely rapidly into a remarkable low density bubble created before the explosion by the white dwarf system. Near the plane of our Milky Way Galaxy, RCW 86 is about 8,200 light-years away and has an estimated radius of 50 light-years.

RCW 86: Historical Supernova Remnant
RCW 86: Historical Supernova Remnant
(C) Jacco Vink (Univ. Utrecht) et al., XMM-Newton: ESA Chandra: NASA / CXC

RCW 86 RCW 86
RCW 86
(C) NASA/ESA
RCW 86
(C) NASA/ESA
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RCW 86 (Supernova Remnant) : Movie

RCW 86 in 60 Seconds
In 185 A.D., Chinese astronomers noted a "guest star" that mysteriously appeared in the sky and stayed for about 8 months.
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「ウィキペディア(wikipedia):フリー百科事典」より文章引用。
SN 185. (2013, April 9). In Wikipedia.
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