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천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

은하단 충돌에서 암흑 물질의 무중력 상호 작용

The nongravitational interactions of dark matter in colliding galaxy clusters
  • 작성자 : KASI
  • 작성일 : 2015-03-31
  • 조회수 : 2433
  • 저자David Harvey, Richard Massey et al.,
  • Absract

     

     

    Collisions between galaxy clusters provide a test of the nongravitational forces acting on dark matter. Dark matter’s lack of deceleration in the “bullet cluster” collision constrained its self-interaction cross section σDM/m < 1.25 square centimeters per gram (cm2/g) [68% confidence limit (CL)] (σDM, self-interaction cross section; m, unit mass of dark matter) for long-ranged forces. Using the Chandra and Hubble Space Telescopes, we have now observed 72 collisions, including both major and minor mergers. Combining these measurements statistically, we detect the existence of dark mass at 7.6σ significance. The position of the dark mass has remained closely aligned within 5.8 ± 8.2 kiloparsecs of associated stars, implying a self-interaction cross section σDM/m < 0.47 cm2/g (95% CL) and disfavoring some proposed extensions to the standard model.

     


  • 게재정보SCIENCE(2015.03.27)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.sciencemag.org/content/347/6229/1462.abstract
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