MISC

2010年3月

Measuring spin of a supermassive black hole at the Galactic centre - implications for a unique spin

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Y. Kato
  • ,
  • M. Miyoshi
  • ,
  • R. Takahashi
  • ,
  • H. Negoro
  • ,
  • R. Matsumoto

403
1
開始ページ
L74
終了ページ
L78
記述言語
英語
掲載種別
DOI
10.1111/j.1745-3933.2010.00818.x
出版者・発行元
WILEY-BLACKWELL PUBLISHING, INC

We determine the spin of a supermassive black hole in the context of disc-seismology by comparing newly detected quasi-periodic oscillations (QPOs) of radio emission in the Galactic centre, Sagittarius A* (Sgr A*), as well as infrared and X-ray emissions with those of the Galactic black holes. We find that the spin parameters of black holes in Sgr A* and in Galactic X-ray sources have a unique value of approximate to 0.44 which is smaller than the generally accepted value for supermassive black holes, suggesting evidence for the angular momentum extraction of black holes during the growth of supermassive black holes. Our results demonstrate that the spin parameter approaches the equilibrium value where spin-up via accretion is balanced by spin-down via the Blandford-Znajek mechanism regardless of its initial spin. We anticipate that measuring the spin of black holes by using QPOs will open a new window for exploring the evolution of black holes in the Universe.

Web of Science ® 被引用回数 : 41

リンク情報
DOI
https://doi.org/10.1111/j.1745-3933.2010.00818.x
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000276351600016&DestApp=WOS_CPL
ID情報
  • DOI : 10.1111/j.1745-3933.2010.00818.x
  • ISSN : 0035-8711
  • Web of Science ID : WOS:000276351600016

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