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|Title:||Geometrical constraints on the origin of timing signals from black holes||Authors:||Motta, Sara. E.
BELLONI, Tomaso Maria Melchiorre
|Issue Date:||2015||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||447||Issue:||2||First Page:||2059||Abstract:||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-C QPOs 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.||Acknowledgments:||SEM acknowledges Peggy Varniere, Lucy Heil and Erik Kuulkers for useful comments and discussion on this work. SEM and MH acknowledge support from the ESA research fellowship programme and from the ESAC Faculty. SEM also acknowledges the Observatory of Rome and Brera for hospitality. TMD and PC acknowledge support from the ESAC Faculty and ESA for hospitality. TMB and SEM acknowledge support from INAF PRIN 2012-6. TMD acknowledges funding via an EU Marie Curie Intra-European Fellowship under contract no. 2011-301355. PC acknowledges support by a Marie Curie FP7-Reintegration-Grants under contract no. 2012-322259. This research has made use of data obtained from the High Energy Astrophysics Science Archive Research Center (HEASARC), provided by NASA's Goddard Space Flight Center.||URI:||http://hdl.handle.net/20.500.12386/25210||URL:||https://academic.oup.com/mnras/article/447/2/2059/2593782||ISSN:||0035-8711||DOI:||10.1093/mnras/stu2579||Bibcode ADS:||2015MNRAS.447.2059M||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Sep 23, 2020
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