Here's is Winkler and Petre's published article, and Chandra press release:

• Direct Measurement of Neutron Star Recoil in the Oxygen-rich Supernova Remnant Puppis A,
  The Astrophysical Journal, 670:635-642, 2007 November 20 , P. Frank Winkler, Robert Petre (arxiv.org version)
• Chandra Discovers Cosmic Cannonball (November 28, 2007)

Do I understand correctly that:

• The "pulsar" has an "apparent lack of pulsations"?
• The oxygen-rich ejecta is characterised with filamentary structure and knots?
• The oxygen-rich cloud is ionized (negatively) and moving north-west. The neutron core ("presumed", RX J0822–4300) may have a hydrogen atmosphere (presumably ionized positively), and moving south-east. (see the Arxiv.org paper), though other papers suggest it is hydrogen deficient,[ref]

I also note that:

• The x-ray emission from the core is derived from the synchrotron process [ref]

__________________
Ian Tresman
plasma-universe.com