Infrared imaging and polarimetric observations of the pulsar wind nebula in SNR G21.5-0.9

Abstract

We present infrared observations of the supernova remnant G21.5-0.9 with the Very Large Telescope, the Canada-France-Hawaii Telescope and the Spitzer Space Telescope. Using the VLT/ISAAC camera equipped with a narrow-band [FeII] 1.64um filter the entire pulsar wind nebula in SNR G21.5-0.9 was imaged. This led to detection of iron line-emitting material in the shape of a broken ring-like structure following the nebula's edge. The detected emission is limb-brightened. We also detect the compact nebula surrounding PSR J1833-1034, both through imaging with the CFHT/AOB-KIR instrument (K' band) and the IRAC camera (all bands) and also through polarimetric observations performed with VLT/ISAAC (Ks band). The emission from the compact nebula is highly polarised with an average value of the linear polarisation fraction $P_L^{avg}\simeq 0.47$, and the swing of the electric vector across the nebula can be observed. The infrared spectrum of the compact nebula can be described as a power law of index ${\alpha }_{IR}=0.7\pm 0.3$, and suggests that the spectrum flattens between the infrared and X-ray bands.

11 pages, 13 figures, accepted by A&A; more detailed discussion of the reduction and analysis of the narrow-band imaging data added in Sect. 2.4, which results in the change of the structure of Fig.4; uncertainty of the infrared power-law index re-estimated, results in updating Fig.6; minor changes in Sect. 4.2 to estimates of X-ray fluxes and their uncertainties and also to the radio upper limit

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