Controversy of the GRO J1655-40 black hole mass and spin estimates and its possible solutions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19240%2F16%3AN0000017" target="_blank" >RIV/47813059:19240/16:N0000017 - isvavai.cz</a>

Result on the web

<a href="http://iopscience.iop.org/article/10.3847/0004-637X/825/1/13/meta" target="_blank" >http://iopscience.iop.org/article/10.3847/0004-637X/825/1/13/meta</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/0004-637X/825/1/13" target="_blank" >10.3847/0004-637X/825/1/13</a>

Result language

angličtina

Original language name

Controversy of the GRO J1655-40 black hole mass and spin estimates and its possible solutions

Original language description

Estimates of the black hole mass M and the dimensionless spin a in the microquasar GRO J1655-40 implied by strong gravity effects related to the timing and spectral measurements are controversial, if the mass restriction determined by the dynamics related to independent optical measurements, $M_{opt} = (5.4 +/- 0.3) M_{circle dot}$, is applied. The timing measurements of twin high-frequency (HF) quasiperiodic oscillations (QPOs) with the frequency ratio 3:2 and the simultaneously observed low-frequency (LF) QPO imply spin in the range $a in (0.27-0.29)$ if models based on the frequencies of geodesic epicyclic motion are used to fit the timing measurements, and the correlated creation of the twin HF QPOs and the LF QPO at a common radius is assumed. On the other hand, the spectral continuum method implies $a in (0.65-0.75)$, and the Fe-line-profile method implies $a in (0.94-0.98)$. This controversy can be cured if we abandon the assumption of the occurrence of the twin HF QPOs and the simultaneously observed LF QPO at a common radius. We demonstrate that the epicyclic resonance model of the twin HF QPOs is able to predict the spin in agreement with the Fe-profile method, but no model based on the geodesic epicyclic frequencies can be in agreement with the spectral continuum method. We also show that the non-geodesic string loop oscillation model of twin HF QPOs predicts spin $a > 0.3$ under the optical measurement limit on the black hole mass, which is in agreement with both the spectral continuum and Fe-profile methods.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BN - Astronomy and celestial mechanics, astrophysics

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astrophysical Journal

ISSN

0004-637X

e-ISSN

—

Volume of the periodical

825

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

'13-1'-'13-9'

UT code for WoS article

000381930000013

EID of the result in the Scopus database

2-s2.0-84978284882