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Title:
The expansion and radio spectral index of G21.5-0.9: is PSR J1833-1034 the youngest pulsar?
Authors:
Bietenholz, M. F.; Bartel, N.
Affiliation:
AA(Hartebeesthoek Radio Observatory, PO Box 443, Krugersdorp, 1740, South Africa; Department of Physics and Astronomy, York University, Toronto, M3J 1P3, Ontario, Canada), AB(Department of Physics and Astronomy, York University, Toronto, M3J 1P3, Ontario, Canada)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 386, Issue 3, pp. 1411-1416. (MNRAS Homepage)
Publication Date:
05/2008
Origin:
MNRAS
MNRAS Keywords:
supernova remnants
DOI:
10.1111/j.1365-2966.2008.13058.x
Bibliographic Code:
2008MNRAS.386.1411B

Abstract

We report on new 5-GHz Very Large Array (VLA) radio observations of the pulsar-powered supernova remnant G21.5-0.9. These observations have allowed us to make a high-quality radio image of this remnant with a resolution of ~0.7 arcsec. It has a filamentary structure similar to that seen in the Crab Nebula. Radio structure suggestive of the torus seen around the Crab pulsar is tentatively identified. We also compared the new image with one taken ~15 yr earlier at 1.5 GHz, both to find the expansion speed of the remnant and to make a spectral index image. Between 1991 and 2006, we find that the average expansion rate of the remnant is 0.11 +/- 0.02 per cent yr-1, corresponding, for a distance of 5 kpc, to a speed of 910 +/- 160kms-1 with respect to the centre of the nebula. Assuming undecelerated expansion, this expansion speed implies that the age of G21.5-0.9 is 870+200-150 yr, which makes PSR J1833-1034 one of the youngest, if not the youngest, known pulsars in the Galaxy.
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