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Chandra X-ray Image of RX J0822-4300 in Puppis A
(Credit: NASA/CXC/Middlebury College/F.Winkler et al.)

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RX J0822-4300 in Puppis A:
Chandra Discovers Cosmic Cannonball


RX J0822-4300 in Puppis A
Credit: Chandra: NASA/CXC/Middlebury College/F.Winkler et al; ROSAT: NASA/GSFC/S.Snowden et al.; Optical: NOAO/AURA/NSF/Middlebury College/F.Winkler et al.

This graphic shows a wide-field view of the Puppis A supernova remnant along with a close-up image of the neutron star, known as RX J0822-4300, that is moving at a blistering pace. The larger field-of-view is a composite of X-ray data from the ROSAT satellite (pink) and optical data (purple), from the Cerro Tololo Inter-American Observatory 0.9-meter telescope, which highlights oxygen emission. Astronomers think Puppis A was created when a massive star ended its life in a supernova explosion about 3,700 years ago, forming an incredibly dense object called a neutron star and releasing debris into space.

The neutron star was ejected by the explosion. The inset box shows two observations of this neutron star obtained with the Chandra X-ray Observatory over the span of five years, between December 1999 and April 2005. By combining how far it has moved across the sky with its distance from Earth, astronomers determined the cosmic cannonball is moving at over 3 million miles per hour, one of the fastest moving stars ever observed. At this rate, RX J0822-4300 is destined to escape from the Milky Way after millions of years, even though it has only traveled about 20 light years so far.

The results from this study suggest the supernova explosion was lop-sided, kicking the neutron star in one direction and much of the debris from the explosion in the other. The estimated location of the explosion is shown in a labeled version of the composite image. The direction of motion of the cannonball, shown by an arrow, is in the opposite direction to the overall motion of the oxygen debris, seen in the upper left. In each case, the arrows show the estimated motion over the next 1,000 years. The oxygen clumps are believed to be massive enough so that momentum is conserved in the aftermath of the explosion, as required by fundamental physics.


Fast Facts for RX J0822-4300 in Puppis A:
Credit  Chandra: NASA/CXC/Middlebury College/F.Winkler et al; ROSAT: NASA/GSFC/S.Snowden et al.; Optical: NOAO/AURA/NSF/Middlebury College/F.Winkler et al.
Scale  Inset is 14.5arcsec across
Category  Neutron Stars/X-ray Binaries, Supernovas & Supernova Remnants
Coordinates (J2000)  RA 08h 23m 08.16s | Dec -42° 41' 41.40"
Constellation  Puppis
Observation Date  12/21/1999 and 04/25/2005
Observation Time  14 hours
Obs. ID  749, 4612
Color Code  X-ray (Pink); Optical (Purple)
Instrument  HRC
Distance Estimate  About 7,000 light years
References F. Winkler et al.,2007,ApJ,670, 635
Release Date  November 28, 2007