On the early evolution of massive star clusters: the case of cloud D1 and its embedded cluster in NGC 5253

On the early evolution of massive star clusters: the case of cloud D1 and its embedded cluster in NGC 5253
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论大质量星团的早期演化:以NGC 5253中的云D1及其嵌入星团为例

DOI:
10.1093/mnras/staa705
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发表时间:
2020
影响因子:
4.8
通讯作者:
Turner, Jean
Turner, Jean
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Silich, Sergiy;Tenorio-Tagle, Guillermo;Martínez-González, Sergio;Turner, Jean

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我们讨论了大质量星星团早期演化的理论模型,并将其与附近矮球状星系NGC 5253中被分子云D1高度遮蔽的年轻恒星团的阿尔马、射电和红外观测相对抗。我们发现,在D1集群的中心区域的大的湍流压力可能会导致个别风吹气泡达到压力约束之前遇到他们的邻居。在这种情况下,恒星风的能量被添加到单个大质量恒星周围的热冲击风气体口袋中,导致它们相遇并在不到105年的时间尺度内产生星团风。为了抑制云扩散的可能性,或者早期的负星星形成反馈,我们应该考虑可能来自主序前(PMS)低质量恒星通过其原恒星盘的光蒸发而产生的质量负载。每个PMS星星的质量负载率超过8 × 10− 9 M <$yr− 1,这是延长这个特殊星团中隐藏星星阶段所必需的。在这种状态下,母云保持相对不受干扰,而分子、光电离和热气体的口袋在恒星形成区域内共存。尽管如此,云D1和它的嵌入星团最有可能的情况是,单个大质量恒星周围的热冲击风应该在几百万年前合并,那时PMS星星原恒星盘消失,质量负载停止,使星团形成全球风。
We discuss a theoretical model for the early evolution of massive star clusters and confront it with the ALMA, radio, and infrared observations of the young stellar cluster highly obscured by the molecular cloud D1 in the nearby dwarf spheroidal galaxy NGC 5253. We show that a large turbulent pressure in the central zones of D1 cluster may cause individual wind-blown bubbles to reach pressure confinement before encountering their neighbours. In this case, stellar winds energy is added to the hot shocked wind pockets of gas around individual massive stars that leads them to meet and produce a cluster wind in time-scales less than 105yr. In order to inhibit the possibility of cloud dispersal, or the early negative star formation feedback, one should account for mass loading that may come, for example, from pre-main-sequence (PMS) low-mass stars through photoevaporation of their protostellar discs. Mass loading at a rate in excess of 8 × 10−9M⊙yr−1per each PMS star is required to extend the hidden star cluster phase in this particular cluster. In this regime, the parental cloud remains relatively unperturbed, while pockets of molecular, photoionized and hot gas coexist within the star-forming region. Nevertheless, the most likely scenario for cloud D1 and its embedded cluster is that the hot shocked winds around individual massive stars should merge at an age of a few million of years when the PMS star protostellar discs vanish and mass loading ceases that allows a cluster to form a global wind.
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