Fig. 1
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Smoothed colour Chandra image of the central 4 × 4 arcmin of Westerlund 1. Soft (0.5–2.0 keV), medium (2.0–4.0 keV), and hard (4–8.0 keV) X-ray photons are shown with red, green, and blue colours, respectively. Yellow circles show 19 out of the 20 detected WR stars. The WR star N is not depicted, as it is located ~4.5 arcmin south of the centre of the star cluster.
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