Journal Article

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

Beike Hiemstra, Mariano Méndez, Chris Done, María Díaz Trigo, Diego Altamirano and Piergiorgio Casella

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 1, pages 137-150
Published in print February 2011 | ISSN: 0035-8711
Published online January 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17661.x
A strong and broad Fe line in the XMM–Newton spectrum of the new X-ray transient and black hole candidate XTE J1652−453

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We observed the new X-ray transient and black hole candidate XTE J1652−453 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 J1652−453 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 J1652−453 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.

Keywords: accretion, accretion discs; black hole physics; stars: individual: XTE J1652−453; X-rays: binaries

Journal Article.  12592 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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