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|Title:||Radio-loudness in black hole transients: evidence for an inclination effect||Authors:||MOTTA, Sara Elisa
Fender, R. P.
|Issue Date:||2018||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||478||Issue:||4||First Page:||5159||Abstract:||Accreting stellar-mass black holes appear to populate two branches in a radio:X-ray luminosity plane. We have investigated the X-ray variability properties of a large number of black hole low-mass X-ray binaries, with the aim of unveiling the physical reasons underlying the radio-loud/radio-quiet nature of these sources, in the context of the known accretion-ejection connection. A reconsideration of the available radio and X-ray data from a sample of black hole X-ray binaries confirms that being radio-quiet is the more normal mode of behaviour for black hole binaries. In the light of this we chose to test, once more, the hypothesis that radio-loudness could be a consequence of the inclination of the X-ray binary. We compared the slope of the `hard-line' (an approximately linear correlation between X-ray count rate and rms variability, visible in the hard states of active black holes), the orbital inclination, and the radio-nature of the sources of our sample. We found that high-inclination objects show steeper hard-lines than low-inclination objects, and tend to display a radio-quiet nature (with the only exception of V404 Cyg), as opposed to low-inclination objects, which appear to be radio-loud(er). While in need of further confirmation, our results suggest that - contrary to what has been believed for years - the radio-loud/quiet nature of black-hole low-mass X-ray binaries might be an inclination effect, rather than an intrinsic source property. This would solve an important issue in the context of the inflow-outflow connection, thus providing significant constraints to the models for the launch of hard-state compact jets.||URI:||http://hdl.handle.net/20.500.12386/29137||URL:||https://academic.oup.com/mnras/article-abstract/478/4/5159/5032375?redirectedFrom=fulltext||ISSN:||0035-8711||DOI:||10.1093/mnras/sty1440||Bibcode ADS:||2018MNRAS.478.5159M||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Jan 18, 2021
checked on Jan 18, 2021
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