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천문우주과학 연구동향

천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

은하계 중심으로부터 유래한 강력한 소용돌이에 의한 가열과 냉각 작용

Turbulent heating in galaxy clusters brightest in X-rays
  • 작성자 : KASI
  • 작성일 : 2014-11-06
  • 조회수 : 3345
  • 저자I. Zhuravleva, E. Churazov. et al.
  • Absract

     

     

    The hot (107 to 108 kelvin),X-ray-emitting intraclustermedium(ICM) is the dominant baryonic constituent of clusters of galaxies. In the cores of many clusters, radiative energy losses from the ICM occur on timescalesmuch shorter than the age of the system.Unchecked, this cooling would lead to massive accumulations of cold gas and vigorous star formation, in contradiction to observations. Various sources of energy capable of compensating for these cooling losses have been proposed, themost promising being heating by the supermassive black holes in the central galaxies, through inflation of bubbles of relativisticplasma.Regardless of the original source of energy, the question of how this energy is transferred to the ICM remains open. Here we present a plausible solution to this question based on deepX-raydata anda newdata analysismethod that enable us to evaluate directly the ICM heating rate fromthe dissipation of turbulence. We find that turbulent heating is sufficient to offset radiative cooling and indeed appears to balance it locally at each radius—it may therefore be the key element in resolving the gas cooling problem in cluster cores and, more universally, in the atmospheres of X-rayemitting, gas-rich systems on scales from galaxy clusters to groups and elliptical galaxies.


  • 게재정보NATURE(2014.11.06)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v515/n7525/pdf/nature13830.pdf
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