Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-11-13
Astronomy and Astrophysics
Astrophysics
6 pages. Accepted for publication in the Astronomy and Astrophysics Special Issue on 1st science with XMM-Newton
Scientific paper
10.1051/0004-6361:20000224
Recent XMM-Newton observations reveal an extended (150") low-surface brightness X-ray halo in the supernova remnant G21.5-0.9. The near circular symmetry, the lack of any limb brightening and the non-thermal spectral form, all favour an interpretation of this outer halo as an extension of the central synchrotron nebula rather than as a shell formed by the supernova blast wave and ejecta. The X-ray spectrum of the nebula exhibits a marked spectral softening with radius, with the power-law spectral index varying from Gamma = 1.63 +/- 0.04 in the core to Gamma = 2.45 +/- 0.06 at the edge of the halo. Similar spectral trends are seen in other Crab-like remnants and reflect the impact of the synchrotron radiation losses on very high energy electrons as they diffuse out from the inner nebula. A preliminary timing analysis provides no evidence for any pulsed X-ray emission from the core of G21.5-0.9.
Bernard J.-Ph.
Bocchino Fabrizio.
Decourchelle Anne
Ferrando Ph.
Griffiths Gareth R.
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