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The Extended X-ray Halo of the Crab-like SNR G21.5-0.9 | | R.S. Warwick
; J-P. Bernard
; F. Bocchino
; A. Decourchelle
; P. Ferrando
; R.G. Griffiths
; F. Haberl
; N. La Palombara
; D. Lumb
; S. Mereghetti
; A.M. Read
; D. Schaudel
; N. Schurch
; A. Tiengo
; R. Willingale
; | | Date: |
13 Nov 2000 | | Subject: | astro-ph | | Affiliation: | University of Leicester. England., Institute d’Astrophysique Spatiale. France., ESTEC. The Netherlands., Service d’Astrophysique. France., Max-Planck-Institut fur extraterrestrische Physik. Germany., Istituto di Fisica Cosmica ``G.Oc | | Abstract: | 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. | | Source: | arXiv, astro-ph/0011245 | | Services: | Forum | Review | PDF | Favorites | |
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