Non‐geodesic corrections to mass‐spin estimates for Galactic microquasars implied by quasiperiodic oscillation models

We study frequencies of axisymmetric and non‐axisymmetric epicyclic modes of accretion disk oscillations and explore the influence of pressure forces present in the disk. We utilize both approximate analytic methods and methods dealing with exact numerical solutions. Our investigation implies conseq...

Full description

Saved in:
Bibliographic Details
Published in:Astronomische Nachrichten 2019-01, Vol.340 (1-3), p.112-115
Main Authors: Kotrlová, A., Šrámková, E., Török, G., Goluchová, K., Horák, J., Straub, O.
Format: Article
Language:English
Subjects:
accretion
Accretion disks
Approximation
Astronomical models
Astrophysics
binaries
black hole physics
Microquasars
Numerical methods
Oscillations
Physics
X‐rays
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We study frequencies of axisymmetric and non‐axisymmetric epicyclic modes of accretion disk oscillations and explore the influence of pressure forces present in the disk. We utilize both approximate analytic methods and methods dealing with exact numerical solutions. Our investigation implies consequences for estimations of black hole spin in the three Galactic microquasars, namely GRS 1915+105, GRO J1655‐40, and XTE J1550‐564, which have been carried out based on several models of 3:2 high‐frequency quasiperiodic oscillations (QPOs). In the particular case of 3:2 epicyclic resonance model, the presence of pressure forces affects the predicted QPO frequencies only slightly when a < 0.9. On the contrary, when a > 0.9, the influence of pressure forces is nonnegligible. Our findings indicate that for several models this influence can be quite significant even for low values of spin.
ISSN:0004-6337
1521-3994
DOI:10.1002/asna.201913572