Fig. 4.
Spatial spectral index distribution in the SNR G51.04 calculated between 74 and 1400 MHz using the VLSSr and THOR + VGPS images. To create this spectral map, which has a resolution of 75″, the input images at 74 and 1400 MHz were masked at 3.5σ and 3σ of their respective noise levels. The superimposed contours correspond to the 74 MHz emission at levels 0.34, 0.58, and 0.78 Jy beam−1.
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