How rapidly do neutron stars spin at birth?

Details How rapidly do neutron stars spin at birth? How rapidly do neutron stars spin at birth?

2008-11-21

arxiv.org/abs/0811.3605v1

Astronomy and Astrophysics

Astrophysics

to appear in the proceedings of the 10th Asian-Pacific Regional IAU Meeting (APRIM 2008), Kunming, China, Aug 2008

Scientific paper

We have studied the X-ray properties of ageing historical core-collapse supernovae in nearby galaxies, using archival data from Chandra, XMM-Newton and Swift. We found possible evidence of a young X-ray pulsar in SN 1968D and in few other sources, but none more luminous than ~ a few 10^{37} erg/s. We compared the observational limits to the X-ray pulsar luminosity distribution with the results of Monte Carlo simulations for a range of birth parameters. We conclude that a pulsar population dominated by periods <~ 40 ms at birth is ruled out by the data.

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