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ABSTRACT  We observed the new X‐ray transient and black hole candidate XTE J 1652− 453 simultaneously with  XMM–Newton  and the  Rossi X‐ray Timing Explorer  ( RXTE ). The observation was done during the decay of the 2009 outburst, when XTE J 1652− 453 was in the hard‐intermediate state. The spectrum shows a strong and broad Fe emission line with an equivalent width of ∼450 eV. The profile is consistent with that of a line being produced by reflection off the accretion disc, broadened by relativistic effects close to the black hole. The best‐fitting inner radius of the accretion disc is ∼4 gravitational radii. Assuming that the accretion disc is truncated at the radius of the innermost stable circular orbit, the black hole in XTE J 1652− 453 has a spin parameter of ∼0.5. The power spectrum of the  RXTE  observation has an additional variability component above 50 Hz, which is typical for the hard‐intermediate state. No coherent quasi‐periodic oscillations at low frequency are apparent in the power spectrum, which may imply that we view the system at a rather low inclination angle.

A strong and broad Fe line in the XMM–Newton spectrum of the new X‐ray transient and black hole candidate XTE J1652−453