Fig. 2
Left: ROSAT R45 (0.47–1.20 keV) band image around A2255 in Galactic coordinates. The two circles (r = 20′) indicate the locations of the A2255 (yellow) and OFFSET (white dashed) observations. Right: NXB-subtracted XIS spectrum of the OFFSET observation. The XIS BI (black) and FI (red) spectra are fitted with the sum of the CXB and the Galactic emission (apec + phabs(apec + powerlaw)). The CXB component is shown as a black curve, and the LHB and MWH emissions are indicated with green and blue curves, respectively.
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