XMM-Newton reveals a tumbling neutron star


XMM-Newton image of pulsar 'RX J0720.4-3125'
 
This XMM-Newton X-ray image shows the portion of the sky around the pulsar named 'RX J0720.4-3125', which is the central bright object appearing in red.

This spinning star has been observed by XMM-Newton over a few years, and has shown an unexpected variation in the observed thermal emission. According to astronomers, this effect is not due to a real variation in temperature, but instead to a changing viewing geometry. The pulsar is most probably a slowly tumbling star, which exposes different areas of the surface over time.

Animation of rotating and 'thumbling' neutron star
 
This animation shows a rotating and precessing neutron star with two hot polar caps.



Release date: 20 April 2006