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A possible interpretation for the apparent differences in LFQPO types in microquasars
Varniere P., Tagger M., Rodriguez J.
Astronomy and Astrophysics 545 (2012) A40 - http://hal.archives-ouvertes.fr/hal-00736618
Physique/Astrophysique/Phénomènes cosmiques de haute energie
Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
A possible interpretation for the apparent differences in LFQPO types in microquasars
P. Varniere1, M. Tagger, J. Rodriguez2, 3
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
http://www.apc.univ-paris7.fr/
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
France
2 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
CEA : DSM/IRFU
France
3 :  AIM - UMR 7158 - Astrophysique Interactions Multi-échelles
http://irfu.cea.fr/Sap/
CNRS : UMR7158 – INSU – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
AIM - UMR 7158, Service d'astrophysique, CEA/Saclay, Orme des Merisiers F-91191 GIF SUR YVETTE CEDEX
France
APC - ADAMIS
Aims: In most microquasars, low-frequency quasi-periodic oscillations (LFQPO) have been classified into three types (A, B and C depending on the peak distribution in the power density spectra and the shape of the noise) but no explanationhas been proposed yet. The accretion-ejection instability (AEI) was presented in 1999 as a possible explanation for the fast varying LFQPO that occur most often. Here we look at a possible generalization to explain the characteristics of the other two LFQPO types. Methods: It was recently shown that when the disk approaches its last stable orbit, the AEI is markedly affected by relativistic effects. We focus on the characteristics of the LFQPO that would result from the relativistic AEI and compare them with the different LFQPO types. Results: The effects of relativity on the AEI seem to be able to explain most of the characteristics of the three types of LFQPO within one formalism.
Anglais
14/09/2012

Astronomy and Astrophysics (Astron. Astrophys.)
Publisher EDP Sciences
ISSN 0004-6361 (eISSN : 1432-0756)
internationale
Articles dans des revues avec comité de lecture
09/2012
545
A40

X-rays: binaries – instabilities – accretion – accretion disks
accepted by A&A

Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1209.3118