4.7 Article

A strong and broad Fe line in the XMM-Newton spectrum of the new X-ray transient and black hole candidate XTEJ1652-453

期刊

出版社

OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2010.17661.x

关键词

accretion, accretion discs; black hole physics; stars: individual: XTEJ1652-453; X-rays: binaries

资金

  1. EU [2009-237722]
  2. STFC [ST/G001588/1] Funding Source: UKRI
  3. Science and Technology Facilities Council [ST/G001588/1] Funding Source: researchfish

向作者/读者索取更多资源

We observed the new X-ray transient and black hole candidate XTEJ1652-453 simultaneously with XMM-Newton and the Rossi X-ray Timing Explorer (RXTE). The observation was done during the decay of the 2009 outburst, when XTEJ1652-453 was in the hard-intermediate state. The spectrum shows a strong and broad Fe emission line with an equivalent width of similar to 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 similar to 4 gravitational radii. Assuming that the accretion disc is truncated at the radius of the innermost stable circular orbit, the black hole in XTEJ1652-453 has a spin parameter of similar to 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.

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