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A classification of the X-ray and radio states of Cyg X-3 and their long-term correlations

Szostek, Anna ; Zdziarski, Andrzej A. ; McCollough, Michael L.

Monthly notices of the Royal Astronomical Society, 2008-08, Vol.388 (3), p.1001-1010 [Periódico revisado por pares]

Oxford, UK: Blackwell Publishing Ltd

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  • Título:
    A classification of the X-ray and radio states of Cyg X-3 and their long-term correlations
  • Autor: Szostek, Anna ; Zdziarski, Andrzej A. ; McCollough, Michael L.
  • Assuntos: accretion ; accretion discs ; accretion, accretion discs ; Astronomy ; Astrophysics ; binaries: general ; Earth, ocean, space ; Exact sciences and technology ; Radio astronomy ; radio continuum: stars ; Spectrum analysis ; stars: individual: Cyg X-3 ; X-rays ; X-rays: binaries ; X-rays: stars
  • É parte de: Monthly notices of the Royal Astronomical Society, 2008-08, Vol.388 (3), p.1001-1010
  • Notas: ark:/67375/HXZ-7KH69R1M-X
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  • Descrição: We present a detailed classification of the X-ray states of Cyg X-3 based on the spectral shape and a new classification of the radio states based on the long-term correlated behaviour of the radio and soft X-ray light curves. We find a sequence of correlations, starting with a positive correlation between the radio and soft X-ray fluxes in the hard spectral state, changing to a negative one at the transition to soft spectral states. The temporal evolution can be in either direction on that sequence, unless the source goes into a very weak radio state, from which it can return only following a major radio flare. The flare decline is via relatively bright radio states, which results in a hysteresis loop on the flux–flux diagram. We also study the hard X-ray light curve, and find its overall anticorrelation with the soft X-rays. During major radio flares, the radio flux responds exponentially to the level of a hard X-ray high-energy tail. We also specify the detailed correspondence between the radio states and the X-ray spectral states. We compare our results to those of black hole and neutron star binaries. Except for the effect of strong absorption and the energy of the high-energy break in the hard state, the X-ray spectral states of Cyg X-3 closely correspond to the canonical X-ray states of black hole binaries. Also, the radio/X-ray correlation closely corresponds to that found in black hole binaries, but it significantly differs from that in neutron star binaries. Overall, our results strongly support the presence of a black hole in Cyg X-3.
  • Editor: Oxford, UK: Blackwell Publishing Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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