A relativistic funnel scattering model with variable bulk velocity reproduces the ~23% hard-state and ~12% soft-state polarization in Cygnus X-3 at low inclination using half-opening angles of 13-16 degrees.
Irradiation of an Accretion Disc by a Jet: General Properties and Implications for Spin Measurements of Black Holes
3 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
X-ray irradiation of the accretion disc leads to strong reflection features, which are then broadened and distorted by relativistic effects. We present a detailed, general relativistic approach to model this irradiation for different geometries of the primary X-ray source. These geometries include the standard point source on the rotational axis as well as more jet-like sources, which are radially elongated and accelerating. Incorporating this code in the relline model for relativistic line emission, the line shape for any configuration can be predicted. We study how different irradiation geometries affect the determination of the spin of the black hole. Broad emission lines are produced only for compact irradiating sources situated close to the black hole. This is the only case where the black hole spin can be unambiguously determined. In all other cases the line shape is narrower, which could either be explained by a low spin or an elongated source. We conclude that for all those cases and independent of the quality of the data, no unique solution for the spin exists and therefore only a lower limit of the spin value can be given.
fields
astro-ph.HE 3years
2026 3representative citing papers
IXPE measures 7.9% polarization in 4U 1822-37 with energy dependence and eclipse variation consistent with scattering in an extended corona at high inclination.
Fe Kα lines from accreting black holes are produced mostly outside 10 gravitational radii due to radial ionization gradients, allowing broad profiles without high spin.
citing papers explorer
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Relativistic Scattering in the Funnel of Cygnus X-3
A relativistic funnel scattering model with variable bulk velocity reproduces the ~23% hard-state and ~12% soft-state polarization in Cygnus X-3 at low inclination using half-opening angles of 13-16 degrees.
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The first IXPE view of the eclipsing ADC source 4U 1822-37
IXPE measures 7.9% polarization in 4U 1822-37 with energy dependence and eclipse variation consistent with scattering in an extended corona at high inclination.
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Simulation-Based Prediction of Black Hole Fe K$\alpha$ Line Profiles
Fe Kα lines from accreting black holes are produced mostly outside 10 gravitational radii due to radial ionization gradients, allowing broad profiles without high spin.