The Dark Energy Camera captured the entirety of RCW 86, the remnant of humanity's first recorded supernovae, in a new image.
Ancient records of celestial events can also be uncertain because of confusion between supernovae and comets. In the Hou Han shu, there’s no record of the guest star moving, and the location the Chinese recorded agrees with the position of RCW 86, the debris ring from the SN. Modern astronomers are pretty sure the Hou Han shu recorded SN 185, especially since modern high-tech observations help confirm it.
But astronomers didn’t know all that at first. They had to figure it all out, and RCW 86 was misleading because of its size.. That type of supernova would take about 10,000 years to form the remnant we see today. So astronomers weren’t certain that RCW 86 was associated with SN 185. The timing was way off by over 8,000 years.
This study corrected RCW 86’s age to about 2,000 years old, right in line with SN 185. “Finally,” the authors of the 2006 paper wrote, “we show that the derived shock velocity strengthens the case that RCW 86 is the remnant of SN 185.” In a Type Ia supernova, a white dwarf draws matter from a companion star until its mass hits a limit which leads to collapse and then an explosion. Credit: NASA
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