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. 2000 Apr 10;533(1):L29-L32.
doi: 10.1086/312589.

Chandra Observations of the Crab-like Supernova Remnant G21.5-0.9

P Slane, Y Chen, NS Schulz, FD Seward, JP Hughes, BM Gaensler

Chandra Observations of the Crab-like Supernova Remnant G21.5-0.9

P Slane et al. Astrophys J. .

Abstract

Chandra observations of the Crab-like supernova remnant G21.5-0.9 reveal a compact central core and spectral variations indicative of synchrotron burn-off of higher energy electrons in the inner nebula. The central core is slightly extended, perhaps indicating the presence of an inner wind-shock nebula surrounding the pulsar. No pulsations are observed from the central region, yielding an upper limit of approximately 40% for the pulsed fraction. A faint outer shell may be the first evidence of the expanding ejecta and blast wave formed in the initial explosion, indicating a composite nature for G21.5-0.9.

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