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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Geometrical constraints on the origin of timing signals from black holes
Monthly Notices of the Royal Astronomical Society, Volume 447, No. 2, Year 2015
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Description
We present a systematic study of the orbital inclination effects on black hole transients fast time-variability properties. We have considered all the black hole binaries that have been densely monitored by the Rossi X-ray Timing Explorer satellite. We find that the amplitude of low-frequency quasi-periodic oscillations (QPOs) depends on the orbital inclination. type-C QPOs are stronger for nearly edge-on systems (high inclination), while type-B QPOs are stronger when the accretion disc is closer to face-on (low inclination). Our results also suggest that the noise associated with type-CQPOs is consistent with being stronger for low-inclination sources, while the noise associated with type-B QPOs seems inclination independent. These results are consistent with a geometric origin of the type-C QPOs-for instance arising from relativistic precession of the inner flow within a truncated disc-while the noise would correspond to intrinsic brightness variability from mass accretion rate fluctuations in the accretion flow. The opposite behaviour of type-B QPOs-stronger in low-inclinations sources-supports the hypothesis that type-B QPOs are related to the jet, the power of which is the most obvious measurable parameter expected to be stronger in nearly face-on sources. © 2015 The Authors.
Authors & Co-Authors
Motta, Sara Elisa
Spain, Madrid
European Space Astronomy Centre
Casella, Piergiorgio
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Henze, Martin
Spain, Madrid
European Space Astronomy Centre
Muñoz-Darías, Teodoro
United Kingdom, Oxford
University of Oxford
Sanna, Andrea
Italy, Cagliari
Università Degli Studi Di Cagliari
Fender, Robert P.
United Kingdom, Oxford
University of Oxford
Belloni, Tomaso M.
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Statistics
Citations: 121
Authors: 7
Affiliations: 4
Identifiers
Doi:
10.1093/mnras/stu2579
ISSN:
00358711