High resolution X-ray and radio images of the Crab-like supernova remnant G21.5-0.9

Astronomy and Astrophysics – Astronomy

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Image Resolution, Radio Sources (Astronomy), Supernova Remnants, X Ray Astronomy, Astronomical Maps, Astronomical Models, Brightness Temperature, High Resolution, Luminosity, Nebulae, Polarization

Scientific paper

The Crab-like supernova remnant G21.5-0.9 has been imaged at 6 cm wavelength with the VLA and between 0.1-4 keV with the Einstein Observatory. Both the X-ray and radio images show a centrally peaked distribution of extended emission with no indication of a pointlike component. In contrast, the linearly polarized radio emission is distributed in a ring with a distinct central minimum. The electric vectors of the polarized radio emission are oriented circumferentially. The data support a Crab-like model for G21.5-0.9, but one in which a lower percentage of the radiated flux is emitted as X-rays relative to the Crab Nebula.

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