Testing relativistic accretion disk models with GRO J1655-40

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00571139" target="_blank" >RIV/67985815:_____/23:00571139 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/23:10468704
Result on the web
<a href="https://doi.org/10.1002/asna.20230019" target="_blank" >https://doi.org/10.1002/asna.20230019</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/asna.20230019" target="_blank" >10.1002/asna.20230019</a>

Result language
angličtina
Original language name
Testing relativistic accretion disk models with GRO J1655-40
Original language description
Black hole X-ray binaries are ideal environments to test the accretion phenomena in the presence of strong gravitational potentials. KERRBB held an important place in the X-ray spectral continuum method for measuring the black hole spin modeling the emission from the innermost regions of the accretion disk. In this work, we present the results of X-ray spectral analysis using publicly available RXTE data of GRO J1655-40 obtained during the 2005 outburst with the two relativistic accretion disk models, KERRBB and KYNBB. Our analysis showed that both models provide identical results with black hole spin measurements, disk temperature, and disk luminosity when the inner edge of the accretion disk is set at the innermost stable circular orbit (ISCO) for the same accretion rates. We could not obtain reasonable fits for similar to 89% of the observations with a fixed black hole spin value at a(*) = 0.7 using both models. Allowing the spin parameter to vary improved the fit statistic significantly with reduced chi(2) values being reduced from10 to 100 to below 2. Both models revealed black hole spin values varying between 0.52 < a(*) < 0.94, which can be interpreted as a variable inner edge of the disk throughout different accretion states.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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