Geodesic Model of HF QPOs Tested for Black Holes in Spacetimes Reflecting the Effect of Surrounding ...

@article{65742,
   author = {Stuchlík, Zdeněk and Vrba, Jaroslav},
   article_location = {GB - Spojené království Velké Británie a},
   article_number = {2},
   doi = {http://dx.doi.org/10.3847/1538-4357/ac7f27},
   keywords = {quasi-periodic oscillations;cosmological constant;naked singularities;geodesic motion;Keplerian accretion disks},
   language = {eng},
   issn = {0004-637X},
   journal = {Astrophysical Journal},
   title = {Geodesic Model of HF QPOs Tested for Black Holes in Spacetimes Reflecting the Effect of Surrounding Dark Matter},
   url = {https://iopscience.iop.org/article/10.3847/1538-4357/ac7f27},
   volume = {935},
   year = {2022}
}

TY  - JOUR
ID  - 65742
AU  - Stuchlík, Zdeněk - Vrba, Jaroslav
PY  - 2022
TI  - Geodesic Model of HF QPOs Tested for Black Holes in Spacetimes Reflecting the Effect of Surrounding Dark Matter
JF  - Astrophysical Journal
VL  - 935
IS  - 2
SP  - "91-1"-"91-31"
EP  - "91-1"-"91-31"
SN  - 0004637X
KW  - quasi-periodic oscillations;cosmological constant;naked singularities;geodesic motion;Keplerian accretion disks
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/ac7f27
N2  - Using the simple but robust model of a shell of dark matter (DM) around a Schwarzschild black hole (BH), represented by the mass ratio of the shell and BH Delta M/M, the shell extension Delta r (s) and its inner radius r (s), we study the influence of DM on the spacetime structure and geodesic motion, and provide a classification of the BH+DM shell spacetimes according to the properties of the stable circular geodesics governing Keplerian disks. We focus our attention on the epicyclic motion around circular geodesics that can be related to observational phenomena in X-ray radiation from Keplerian accretion disks, assumed to be influenced by the DM shell only gravitationally. We give the frequencies of the orbital and epicyclic motions and discuss their properties in terms of the parameters governing the DM shell. Using the frequencies in relevant variants of the standard geodesic model of high-frequency quasiperiodic oscillations (HF QPOs), we test the role of DM by fitting the HF QPO data from some microquasars and active galactic nuclei with supermassive BHs where no variant of the geodesic model applied in the standard vacuum BH background is able to explain the data. We thus provide a robust review of the applicability of the geodesic model of HF QPOs, and also provide limits on the amount of DM around a BH. We demonstrate that the geodesic model could be well applied to most observations of active galactic nuclei, with strong restrictions on the amount of invisible matter around BHs.
ER  - 

STUCHLÍK, Zdeněk a Jaroslav VRBA. Geodesic Model of HF QPOs Tested for Black Holes in Spacetimes Reflecting the Effect of Surrounding Dark Matter. \textit{Astrophysical Journal}. GB - Spojené království Velké Británie a, 2022, roč.~935, č.~2, s.~''91-1''-''91-31'', 31 s. ISSN~0004-637X. Dostupné z: https://dx.doi.org/10.3847/1538-4357/ac7f27.