Testing relativistic accretion disk models with GRO J1655-40

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216208:11320/23:10468704

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Testing relativistic accretion disk models with GRO J1655-40

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Testing relativistic accretion disk models with GRO J1655-40

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Astronomische Nachrichten

ISSN

0004-6337

e-ISSN

1521-3994

Svazek periodika

344

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

e20230019

Kód UT WoS článku

000923565400001

EID výsledku v databázi Scopus

2-s2.0-85147337254