This movie from NASA's Chandra X-ray Observatory shows a fast moving jet of particles produced by a rapidly rotating neutron star , and may provide new insight into the nature of some of the densest matter in the universe.
The star of this movie is the Vela pulsar, a neutron star that was formed when a massive star collapsed. The Vela pulsar is about 1,000 light years
from Earth, spans about 12 miles in diameter, and makes over 11
complete rotations every second, faster than a helicopter rotor. As the
pulsar whips around, it spews out a jet of charged particles that race
out along the pulsar's rotation axis at about 70% of the speed of light. In this still image from the movie, the location of the pulsar and the 0.7-light-year-long jet are labeled.
Labeled Vela Pulsar Jet
The Chandra data shown in the movie, containing 8 images obtained
between June and September 2010, suggest that the pulsar may be slowly
wobbling, or precessing, as it spins. The shape and the motion of the
Vela jet look strikingly like a rotating helix, a shape that is
naturally explained by precession, as shown in this animation.
If the evidence for precession of the Vela pulsar is confirmed, it
would be the first time that a jet from a neutron star has been found to
be precessing in this way.
One possible cause of precession for a spinning neutron star is that
it has become slightly distorted and is no longer a perfect sphere. This
distortion might be caused by the combined action of the fast rotation
and "glitches", sudden increases of the pulsar's rotational speed due to
the interaction of the superfluid core of the neutron star with its
crust.
A paper describing these results will be published in The Astrophysical Journal on January 10, 2013. This is the second Chandra movie of the Vela pulsar,
with the original having been released in 2003. The first Vela movie
contained shorter, unevenly spaced observations so that the changes in
the jet were less pronounced and the authors did not argue that
precession was occurring. However, based on the same data, Avinash
Deshpande of Arecibo Observatory in Puerto Rico and the Raman Research
Institute in Bangalore, India, and the late Venkatraman Radhakrishnan,
argued in a 2007 paper that the Vela pulsar might be precessing.
The Earth also precesses as it spins, with a period of about 26,000
years. In the future Polaris will no longer be the "north star" and
other stars will take its place. The period of the Vela precession is
much shorter and is estimated to be about 120 days.
Wide field Optical and X-ray
The supernova that formed the Vela pulsar exploded over 10,000 years ago. This optical image from the Anglo-Australian Observatory's UK Schmidt telescope shows the enormous apparent size of the supernova remnant formed by the explosion. The full size of the remnant is about eight degrees across, or about 16 times the angular size of the moon. The square near the center shows the Chandra image with a larger field-of-view than used for the movie, with the Vela pulsar in the middle.
| Fast Facts for Vela Pulsar Jet: | |||
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| Scale : | Movie is 4.8 x 3.6 arcmin (1.4 x 1.0 light years) | ||
| Category : | Neutron Stars/X-ray Binaries | ||
| Coordinates (J2000) : | RA 08h 35m 20.60s | Dec -45° 10' 35.00" | ||
| Constellation : | Vela | ||
| Observation Date : | 8 pointings between Jul 2009 and Sep 2010 | ||
| Observation Time : | 89 hours (3 days, 17 hours) | ||
| Obs. ID : | 10135-10139, 12073-12075 | ||
| Instrument : | ACIS | ||
| Color Code : | X-ray (Blue) | ||
