HEAPOW: Multicolor Crab (2018 Mar 19)
The Crab Nebula, Messier 1, is the remnant of a stellar explosion that was seen by Chinese astronomers in AD 1054, on the fourth of July. The remnant was first called the "Crab" after a poor drawing of the Nebula by William Parsons, the Third Earl of Rosse, which showed a suspiciously crab-like morphology. The image above shows a new high-resolution multiwavelength image of the nebula, which, admittedly, is quite a bit different from Lord Rosse's drawing. This composite image shows in astounding detail the shape of the ionized gas and dust ejected by or produced in the explosion. It also shows in detail the ongoing interaction between this material and the highly-magnetized pulsar at the center of the nebula. This pulsar is a rapidly spinning neutron star, the compressed core of the massive star which ran out of nuclear fuel, collapsed, and exploded. This image above shows X-ray emission in blue and white (as seen by the Chandra X-ray Observatory), an optical image in purple (from the Hubble Space Telescope), and an infrared image in pink from the Spitzer Space Telescope. The Crab is a favorite source of high-energy astrophysicists especially, since X-ray and Gamma-ray emission produced by the pulsar and in the nebula provides an important example of how stars explode and how their remnants evolve. It is also a bright, extended, steady source, and is an important object for calibrating high energy satellite telescopes. Although it's usually a steady source of emission, sometimes the Crab misbehaves.
CXC: Crab Nebula: A Crab Walks Through Time
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