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천문우주과학 연구동향

천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

광학적 주기성을 가진 퀘이사에서 초거대 블랙홀 쌍성계 존재 가능성

A possible close supermassive black-hole binary in a quasar with optical periodicity
  • 작성자 : KASI
  • 작성일 : 2015-02-06
  • 조회수 : 2565
  • 저자Matthew J. Graham, S. G. Djorgovski,Daniel Stern et al,.
  • Absract

     

    Quasars have long been known to be variable sources at all wavelengths. Their optical variability is stochastic and can be due to a variety of physical mechanisms; it is also well-described statistically in terms of a damped random walk model. The recent availability of large collections of astronomical time series of flux measurements offers new data sets for a systematic exploration of quasar variability. Here we report the detection of a strong, smooth periodic signal in the optical variability of the quasar PG 1302−102 with a mean observed period of 1,884 ± 88 days. It was identified in a search for periodic variability in a data set of light curves for 247,000 known, spectroscopically confirmed quasars with a temporal baseline of about 9 years. Although the interpretation of this phenomenon is still uncertain, the most plausible mechanisms involve a binary system of two supermassive black holes with a subparsec separation. Such systems are an expected consequence of galaxy mergers and can provide important constraints on models of galaxy formation and evolution. 

     


  • 게재정보NATURE에 게재(2015.02.05)된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v518/n7537/full/nature14143.html
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