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Fig. 11

image

η against spectral index (α). Only the pixels that are in the area marked by the dashed circle in Fig. 10 are taken into account, thus the influence of source AA is excluded. The criterion of non-thermal emission, α = −0.1, is shown with a vertical dashed line, while the criterion of stimulated RRL emission, η = 1, is shown as a horizontal dashed line. These two orthogonal lines divide the whole αη space into four quadrants. For each quadrant, the number of pixels within it as a percentage of the number of all the pixels is written. The points with error bars crossing the α = −0.1 or η = 1 lines are colored gray and neglected in the statistics.

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