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

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

2000-01-31

arxiv.org/abs/astro-ph/0001536v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, formatted with emulateapj, submitted to ApJL

Scientific paper

10.1086/312589

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 ~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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