Neutron Stars and Supernovae

Recall that, at least theoretically, a type II supernova explosion leaves a massive core of neutrons behind.

this should make a neutron star.
or else, if it is too massive, it could make a black hole.

Is there any evidence that supernovae are associated with neutron stars?

1)Crab Pulsar

Recall the Crab nebula, the remnant of a supernova that exploded in 1054 AD (minus the light travel time).

One can look for a neutron star at the center. There is one. It has a period of 0.033 s = 33 ms, with one strong pulse and one weak pulse each period.

The pulses are seen in radio emissions (as always for pulsars).
It is also seen in visible light.
- The star winks on twice each 33 ms.
It is also seen in X-rays.

2)Vela Pulsar

The Gum Nebula in the constellation Vela is another supernova remnant. It also contains a pulsar, with a period of 89 ms. It can also be seen in X-ray, optical, and radio wavelenghts.

Davison E. Soper, Institute of Theoretical Science, University of Oregon, Eugene OR 97403 USA soper@bovine.uoregon.edu