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Doughnut strikes sandwich: the geometry of hot medium in accreting black hole X-ray binaries

Poutanen, Juri ; Veledina, Alexandra ; Zdziarski, Andrzej A.

Astronomy and astrophysics (Berlin), 2018-06, Vol.614, p.A79 [Periódico revisado por pares]

Heidelberg: EDP Sciences

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  • Título:
    Doughnut strikes sandwich: the geometry of hot medium in accreting black hole X-ray binaries
  • Autor: Poutanen, Juri ; Veledina, Alexandra ; Zdziarski, Andrzej A.
  • Assuntos: Accretion ; accretion discs ; black hole physics ; Circular orbits ; Cold ; Corona ; Deposition ; Energy conservation ; Ionization ; Orbital stability ; Photons ; Reprocessing ; Spectra ; stars: individual: GX 339-4 ; X ray binaries ; X ray stars ; X-rays: binaries ; X-rays: stars
  • É parte de: Astronomy and astrophysics (Berlin), 2018-06, Vol.614, p.A79
  • Notas: e-mail: juri.poutanen@utu.fi
    bibcode:2018A%26A...614A..79P
    istex:362454401BB7C0C9A1DAC3190A9491099E783ADB
    ark:/67375/80W-TPTG1FTF-Q
    dkey:10.1051/0004-6361/201732345
    publisher-ID:aa32345-17
    href:https://www.aanda.org/articles/aa/abs/2018/06/aa32345-17/aa32345-17.html
  • Descrição: We study the effects of the mutual interaction of hot plasma and cold medium in black hole binaries in their hard spectral state. We consider a number of different geometries. In contrast to previous theoretical studies, we use a modern energy-conserving code for reflection and reprocessing from cold media. We show that a static corona above an accretion disc extending to the innermost stable circular orbit produces spectra not compatible with those observed. They are either too soft or require a much higher disc ionization than that observed. This conclusion confirms a number of previous findings, but disproves a recent study claiming an agreement of that model with observations. We show that the cold disc has to be truncated in order to agree with the observed spectral hardness. However, a cold disc truncated at a large radius and replaced by a hot flow produces spectra which are too hard if the only source of seed photons for Comptonization is the accretion disc. Our favourable geometry is a truncated disc coexisting with a hot plasma either overlapping with the disc or containing some cold matter within it, also including seed photons arising from cyclo-synchrotron emission of hybrid electrons, i.e. containing both thermal and non-thermal parts.
  • Editor: Heidelberg: EDP Sciences
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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