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arXiv 2110.09201astro-ph.GAastro-ph.SR
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会聚星系流中大质量星团的光电离形成

The formation of massive stellar clusters in converging galactic flows with photoionisation

C. L. Dobbs, T. J. R. Bending, A. R. Pettitt, M. R. Bate

摘要:

我们已经进行了模拟的团簇形成沿两个地区的螺旋臂从全球银河系模拟,包括光电离反馈。一个区域的特点是强烈的收敛流,另一个代表一个更典型的螺旋臂区域。我们发现,更大规模的集群能够形成在较短的时间尺度的区域具有强烈的收敛流。集群之间的合并是频繁的情况下,强收敛流,使大规模集群的形成。我们比较了在模拟中形成的等效集群和没有电离。光电离并不阻止大量团簇形成,但可以看出限制了团簇的质量。平均而言,质量减少了约20%,但我们看到从电离到导致质量减少50%的差异很小的大范围。光电离也能够清除Myr时间尺度上星团附近的气体,这可以产生半径更大的星团,这些星团被更大质量的恒星晕包围。我们发现,电离反馈有更多的影响,在我们的第二个区域,这是不太密集,并具有较强的收敛流。

英文摘要:

We have performed simulations of cluster formation along two regions of a spiral arm taken from a global Milky Way simulation, including photoionising feedback. One region is characterised by strongly converging flows, the other represents a more typical spiral arm region. We find that more massive clusters are able to form on shorter timescales for the region with strongly converging flows. Mergers between clusters are frequent in the case of the strongly converging flows and enable the formation of massive clusters. We compare equivalent clusters formed in simulations with and without ionisation. Photoionisation does not prevent massive cluster formation, but can be seen to limit the masses of the clusters. On average the mass is reduced by around 20%, but we see a large spread from ionisation having minimal difference to leading to a 50% reduction in mass. Photoionisation is also able to clear out the gas in the vicinity of the clusters on Myr timescales, which can produce clusters with larger radii that are surrounded by more massive stellar halos. We find that the ionising feedback has more impact in our second region which is less dense and has less strongly converging flows.

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