2001A&A...365L.248W


Query : 2001A&A...365L.248W

2001A&A...365L.248W - Astronomy and Astrophysics, volume 365, L248-253 (2001/1-1)

The extended X-ray halo of the Crab-like SNR G21.5-0.9.

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. and WILLINGALE R.

Abstract (from CDS):

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 Γ=1.63±0.04 in the core to Γ=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.

Abstract Copyright:

Journal keyword(s): ISM: individual (G21.5-0.9) - supernova remnants - X-rays: ISM

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SNR G130.7+03.1 SNR 02 05 37.0 +64 49 42           ~ 577 4
2 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4908 1
3 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5767 4
4 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1238 1
5 SNR G347.3-00.5 SNR 17 12 27 -39 41.2     12.27     ~ 642 1
6 SNR G021.5-00.9 SNR 18 33 33.612 -10 34 07.69           ~ 407 1
7 SNR G074.9+01.2 SNR 20 16 01.8 +37 12 53           ~ 169 2

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2021.08.06-00:06:09

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