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Fig. 4.


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X-ray surface brightness profile (0.4−2.3 keV) in the relic (red) and “non-relic” (black) wedges. The detector and sky backgrounds, including stray light, which is shown by the blue dashed line, have been subtracted. Here, the relic wedge corresponds to 318−336° (counted from the west), while the non-relic wedge covers 0−270°. For the non-relic wedge, the data from the all-sky survey were used. A prominent “bump” at 40−60′ in the relic wedge is due to the gas of the NGC 4839 group. A steep gradient at ∼80′ is seen in the relic wedge (red crosses). Beyond this radius, the surface brightness in the relic wedge matches approximately the mean surface brightness of Coma in other directions.

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