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Cutoff in the hard X-ray spectra of the ultraluminous X-ray sources HoIX X-1 and M82 X-1

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Abstract

Using data from the XMM-Newton and INTEGRAL observatories, we have detected a cutoff at energies above 10 keV in the X-ray spectra of the ultraluminous X-ray sources HoIX X-1 and M82 X-1. The spectra obtained can be described by amodel of Comptonization of radiation in a gas cloud of moderate temperature (kT ∼ 2–3 keV) and high optical depth (τ ∼ 15–25). Such conditions can be fulfilled during supercritical accretion of matter onto a stellar-mass black hole accompanied by a strong gas outflow. The results of this work confirm the existence of a spectral state specific to ultraluminous X-ray sources, which is unlike any of the known spectral states in normal X-ray binaries.

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Authors and Affiliations

  1. Space Research Institute, Russian Academy of Sciences, Moscow, Russia

    S. Yu. Sazonov, A. A. Lutovinov & R. A. Krivonos

  2. Space Sciences Laboratory, University of California, Berkeley, USA

    R. A. Krivonos

Authors
  1. S. Yu. Sazonov
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  2. A. A. Lutovinov
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  3. R. A. Krivonos
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Correspondence to S. Yu. Sazonov.

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Original Russian Text © S.Yu. Sazonov, A.A. Lutovinov, R.A. Krivonos, 2014, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2014, Vol. 40, Nos. 2–3, pp. 83–92.

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Sazonov, S.Y., Lutovinov, A.A. & Krivonos, R.A. Cutoff in the hard X-ray spectra of the ultraluminous X-ray sources HoIX X-1 and M82 X-1. Astron. Lett. 40, 65–74 (2014). https://doi.org/10.1134/S1063773714030062

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  • DOI: https://doi.org/10.1134/S1063773714030062

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