Chandra probes the X-ray variability of M51 ULX-7: evidence of propeller transition and X-ray dips on orbital periods
作者： F. Koliopanos , F. Haberl , H. P. Earnshaw , M. Brightman , G. Vasilopoulos
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摘要: We report on the temporal properties of ULX pulsar M51 ULX-7 inferred from analysis 2018-2020 Swift/XRT monitoring data and archival Chandra obtained over a period 33 days in 2012. find an extended low flux state, which might be indicative propeller transition, lending further support to interpretation that NS is rotating near equilibrium. Alternatively, this off state could related variable super-orbital period. Moreover, we discovery periodic dips X-ray light curve are associated with binary orbital The presence implies configuration where plane closer edge orientation, thus demonstrates favorable geometries not necessary order observe pulsars.These characteristics similar those seen prototypical pulsars like Her X-1 SMC or other NGC 5907 ULX1.
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