A likely inclination dependence in the non-linear variability of quasi-periodic oscillations from black hole binaries

被引:11
作者
Arur, K. [1 ]
Maccarone, T. J. [1 ]
机构
[1] Texas Tech Univ, Dept Phys & Astron, Lubbock, TX 79409 USA
关键词
methods: statistical; X-rays: binaries; X-RAY BINARIES; ACCRETION-EJECTION INSTABILITY; QPO; COMPONENTS; EVOLUTION; BEHAVIOR;
D O I
10.1093/mnras/stz2784
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a systematic analysis of the effects of orbital inclination angle on the non-linear variability properties of type-B and type-C quasi-periodic oscillations (QPOs) from black hole binaries. We use the bicoherence, a measure of phase coupling at different Fourier frequencies for our analysis. We find that there is a likely inclination-dependent change in the non-linear properties of type-C QPOs as the source transitions from a hard intermediate state to a soft intermediate state. High inclination (edge-on) sources show a change from a 'web' to a 'cross' pattern, while the low inclination (face-on) sources show a change from a 'web' to a 'hypotenuse' pattern. We present a scenario of a moderate increase in the optical depth of the Comptonizing region as a possible explanation of these effects. The bicoherence of type-B QPOs do not exhibit any measurable inclination dependence.
引用
收藏
页码:313 / 323
页数:11
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