B3-VLA CSS样品。VII:WSRT偏振观测和周围法拉第介质性质的再研究
The B3-VLA CSS sample. VII: WSRT Polarisation Observations and the Ambient Faraday Medium Properties Revisited
摘要:
我们提出了新的偏振观测在13厘米,获得使用Westerbork合成射电望远镜(WSRT),65个来源,从B3-VLA样品紧凑陡谱源。这些新的数据与我们的VLA偏振数据相结合,在3.6,6和,21厘米,在以前的文件。由于WSRT的多通道频率能力,这些新的13厘米观测能够更可靠地确定综合旋转措施,以及波长的去极化行为。新的数据与我们之前使用的去极化模型不一致,我们提出了一个替代模型,似乎工作正常。我们还修改了我们以前的模型的外部法拉第屏,其依赖于源红移。
英文摘要:
We present new polarisation observations at 13 cm, acquired using the Westerbork Synthesis Radio Telescope (WSRT), of 65 sources, from the B3-VLA sample of Compact Steep-Spectrum sources. These new data are combined with our VLA polarisation data, at 3.6, 6 and, 21 cm, presented in a previous paper. Due to the multi-channel frequency capabilities of the WSRT, these new 13 cm observations enable a more reliable determination of integrated Rotation Measures, and of depolarisation behaviour with wavelength. The new data are inconsistent with the depolarisation models that we used earlier, and we propose an alternative model which seems to work properly. We also revise our previous model for the external Faraday screen, and its dependence on the source redshift.
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