Open Access

Fig. 10.

image

Observed flux from M51 XT-1 as compared with model predictions for a 1.4 M neutron star (red curve) and a 10 M black hole (green curve). Black points correspond to Swift data and blue points to Chandra or XMM-Newton observations (courtesy of M. Brigthman, see also Brightman et al. 2020).

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