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천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

뱀자리 남쪽 성단 내에 존재하는 매우 젊은 원시 은하계 클러스터 내에서의 분자 아웃 플로우

Episodic molecular outflow in the very young protostellar cluster Serpens South
  • 작성자 : KASI
  • 작성일 : 2015-11-23
  • 조회수 : 2467
  • 저자Adele L. Plunkett, Héctor G. Arce et al.,
  • Absract

     

     

    The loss of mass from protostars, in the form of a jet or outflow, is a necessary counterpart to protostellar mass accretion. Outflow ejection events probably vary in their velocity and/or in the rate of mass loss. Such ‘episodic’ ejection events have been observed during the class 0 protostellar phase (the early accretion stage), and continue during the subsequent class I phase that marks the first one million years of star formation. Previously observed episodic-ejection sources were relatively isolated; however, the most common sites of star formation are clusters. Outflows link protostars with their environment and provide a viable source of the turbulence that is necessary for regulating star formation in clusters, but it is not known how an accretion-driven jet or outflow in a clustered environment manifests itself in its earliest stage. This early stage is important in establishing the initial conditions for momentum and energy transfer to the environment as the protostar and cluster evolve. Here we report that an outflow from a young, class 0 protostar, at the hub of the very active and filamentary Serpens South protostellar cluster, shows unambiguous episodic events. The 12C16O (J = 2−1) emission from the protostar reveals 22 distinct features of outflow ejecta, the most recent having the highest velocity. The outflow forms bipolar lobes—one of the first detectable signs of star formation—which originate from the peak of 1-mm continuum emission. Emission from the surrounding C18O envelope shows kinematics consistent with rotation and an infall of material onto the protostar. The data suggest that episodic,
    accretion-driven outflow begins in the earliest phase of protostellar evolution, and that the outflow remains intact in a very clustered environment, probably providing efficient momentum transfer for
    driving turbulence.​


  • 게재정보NATURE(2015.11.05)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v527/n7576/pdf/nature15702.pdf
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