LOFAR high-band antenna observations of the Perseus cluster - The discovery of a giant radio halo

Open Access

Fig. 6

X-ray ROSAT PSPC 0.1–2.4 keV image (Voges et al. 1999) overlaid with 144 MHz LOFAR radio contours. The radio contours are from the 26″ and 80″ resolution images, with the emission from compact sources subtracted in the latter one. Radio contours are logarithmically spaced, starting at 5σ_rms and 2.5σ_rms, respectively. The dashed circle indicates R₅₀₀ (Urban et al. 2014).

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