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Title:
The extended X-ray halo of the Crab-like SNR G21.5-0.9
Authors:
Warwick, R. S.; Bernard, J.-P.; Bocchino, F.; Decourchelle, A.; Ferrando, P.; Griffiths, R. G.; Haberl, F.; La Palombara, N.; Lumb, D.; Mereghetti, S.; Read, A. M.; Schaudel, D.; Schurch, N.; Tiengo, A.; Willingale, R.
Affiliation:
AA( Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK), AB(Institute d'Astrophysique Spatiale, Orsay, France), AC(Space Science Department, ESTEC, 2200 AG Noordwijk, The Netherlands), AD(Service d'Astrophysique, CEA Saclay, 91191 Gif-sur-Yvette, France), AE(Service d'Astrophysique, CEA Saclay, 91191 Gif-sur-Yvette, France), AF( Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK), AG(Max-Planck-Institut für extraterrestrische Physik, 85740, Garching, Germany), AH(Istituto di Fisica Cosmica ``G. Occhialini'', CNR, 20133 Milano, Italy), AI(Space Science Department, ESTEC, 2200 AG Noordwijk, The Netherlands), AJ(Istituto di Fisica Cosmica ``G. Occhialini'', CNR, 20133 Milano, Italy), AK(Max-Planck-Institut für extraterrestrische Physik, 85740, Garching, Germany), AL(Max-Planck-Institut für extraterrestrische Physik, 85740, Garching, Germany), AM( Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK), AN(XMM-SOC, Villafranca Satellite Tracking Station, 28080 Madrid, Spain), AO( Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK)
Publication:
Astronomy and Astrophysics, v.365, p.L248-L253 (2001) (A&A Homepage)
Publication Date:
01/2001
Origin:
EDP Sciences
A&A Keywords:
ISM: INDIVIDUAL (G21.5-0.9), SUPERNOVA REMNANTS, X-RAYS: ISM
DOI:
10.1051/0004-6361:20000224
Bibliographic Code:
2001A&A...365L.248W

Abstract

Recent XMM-Newton observations reveal an extended (r ~ 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.
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