Kvaziperiodické oscilace v mikrokvasarech a Sgr A: měření spinu černých děr

Kód výsledku v IS VaVaI

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Nalezeny alternativní kódy

RIV/47813059:19240/05:#0000798

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

QPOs in microquasars and Sgr A: measuring the black hole spin

Popis výsledku v původním jazyce

In all four microquasars which show double peak kHz QPOs, the ratio of the two frequencies is 3:2. This strongly supports the suggestion that twin peak kHz QPOs are due to a resonance between some modes of accretion disk oscillations. Here, we stress that its to observations of the hypothetical resonances between vertical and radial epicyclic frequencies (particulary of the parametric resonance) give an accurate estimate of the spin for the three microquasars with known mass. Measurement of double peakQPOs frequencies in the Galaxy centre seems also to be consistent with the 3:2 ratio established by previous observations in microquasars, however the SgrA data are rather diffcult for the same exact analysis. If confirmed, the 3:2 ratio of double peak QPOs in Sgr A would be of a fundamental importance for the black hole accretion theory and the precise measurement could help to solve the question of QPOs nature.

Název v anglickém jazyce

QPOs in microquasars and Sgr A: measuring the black hole spin

Popis výsledku anglicky

In all four microquasars which show double peak kHz QPOs, the ratio of the two frequencies is 3:2. This strongly supports the suggestion that twin peak kHz QPOs are due to a resonance between some modes of accretion disk oscillations. Here, we stress that its to observations of the hypothetical resonances between vertical and radial epicyclic frequencies (particulary of the parametric resonance) give an accurate estimate of the spin for the three microquasars with known mass. Measurement of double peakQPOs frequencies in the Galaxy centre seems also to be consistent with the 3:2 ratio established by previous observations in microquasars, however the SgrA data are rather diffcult for the same exact analysis. If confirmed, the 3:2 ratio of double peak QPOs in Sgr A would be of a fundamental importance for the black hole accretion theory and the precise measurement could help to solve the question of QPOs nature.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BE - Teoretická fyzika

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2005

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

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Svazek periodika

326

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

4

Strana od-do

856-860

Kód UT WoS článku

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EID výsledku v databázi Scopus

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