The role of radiation and halo mergers in Pop III star formation
The role of radiation and halo mergers in Pop III star formation
复制标题
辐射和晕合并在 Pop III 恒星形成中的作用
DOI:
10.1093/mnras/stad3167
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发表时间:
2023
影响因子:
4.8
通讯作者:
Turk, Matthew J.
中科院分区:
文献类型:
--
作者:
Correa Magnus, Lilia;Smith, Britton D.;Khochfar, Sadegh;O’Shea, Brian W.;Wise, John H.;Norman, Michael L.;Turk, Matthew J.
We present a study of the co-evolution of a population of primordial star-forming minihaloes at Cosmic Dawn. In this study, we highlight the influence of individual Population III stars on the ability of nearby minihaloes to form sufficient molecular hydrogen to undergo star formation. In the absence of radiation, we find the minimum halo mass required to bring about collapse to be ∼105M⊙, this increases to ∼106M⊙after two stars have formed. We find an inverse relationship between halo mass and the time required for it to recover its molecular gas after being disrupted by radiation from a nearby star. We also take advantage of the extremely high resolution to investigate the effects of major and minor mergers on the gas content of star-forming minihaloes. Contrary to previous claims of fallback of supernova ejecta, we find minihaloes evacuated after hosting Pop III stars primarily recover gas through mergers with undisturbed haloes. We identify an intriguing type of major merger between recently evacuated haloes and gas-rich ones, finding that these ‘mixed’ mergers accelerate star formation instead of suppressing it like their low-redshift counterparts. We attribute this to the gas-poor nature of one of the merging haloes resulting in no significant rise in temperature or turbulence and instead inducing a rapid increase in central density and hydrostatic pressure. This constitutes a novel formation pathway for Pop III stars and establishes major mergers as potentially the primary source of gas, thus redefining the role of major mergers at this epoch.
DOI:
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发表时间:
--
期刊:
影响因子:
--
作者:
通讯作者:
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影响因子:
0.5
作者:
S. Faber;E. Dishoeck;J. Kormendy
通讯作者:
J. Kormendy