Astronomy Picture of the Day_Cape Breton_Nova Scotia

10 Nov

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RCW 86: Historical Supernova Remnant
Credit: X-ray: XMM-Newton, Chandra / IR: WISE, Spitzer

Explanation: 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, show supernova remnant RCW 86, understood to be the remnant of that stellar explosion. The false-color view shows 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.

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Posted by on 10/11/2011 in Uncategorized


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4 responses to “Astronomy Picture of the Day_Cape Breton_Nova Scotia

  1. Anonymous

    10/11/2011 at 6:27 pm

    Incredible! Is this the same one the Chinese astronomers found in 185 AD?

  2. Tom MacDonald

    10/11/2011 at 9:06 pm

    Hi John-dunno-funny cause someone sent me an email asking me basically the same question

  3. Anonymous

    10/11/2011 at 10:25 pm

    Thanks Tom!

  4. Tom MacDonald

    10/11/2011 at 10:41 pm

    K guy-love hearing from peeps when they enjoy


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