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arXiv 2004.02204astro-ph.GA
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相互作用星系团中棒盘星系团的恒星形成增强

Star Formation Enhancement in Barred Disk Galaxies in Interacting Galaxy Clusters

Yongmin Yoon, Myungshin Im

摘要:

最近的一项研究表明,酒吧可以通过星系团的相互作用,但一直不清楚,如果酒吧的形成与星系团之间的相互作用的恒星形成的增强。我们研究了斯隆数字巡天观测数据中105个星系团的$0.015<z<0.060$,以检验16个相互作用星系团中的成星星系($f_\mathrm{sf}$)比例是否比其他非相互作用星系团中的成星星系比例有所增加,并探讨相互作用星系团中$f_\mathrm{sf}$的增加与棒形成之间的可能联系。我们发现,$f_\mathrm{sf}$是适度较高的($\sim20\%$)在相互作用的集群比非相互作用的集群和恒星形成的增强,在相互作用的集群中只发生在中等质量的磁盘为主的星系($10^{10.0} \le M_\mathrm{star}/M_{\odot} < 10^{10.4}$和膨胀的总光比为$\le0.5$)。我们还发现,在相互作用星系团中,中等质量盘控星系的$f_\mathrm{sf}$的增强主要是由于棒星系数目的增加。我们的结果表明,团-团相互作用可以同时诱导盘星系中的酒吧和恒星的形成。

英文摘要:

A recent study shows that bars can be induced via interaction of galaxy clusters, but it has been unclear if the bar formation by the interaction between clusters is related to the enhancement of star formation. We study galaxies in 105 galaxy clusters at $0.015<z<0.060$ detected from Sloan Digital Sky Survey data, in order to examine whether the fraction of star-forming galaxies ($f_\mathrm{sf}$) in 16 interacting clusters is enhanced compared with that of the other non-interacting clusters and to investigate the possible connection between the $f_\mathrm{sf}$ enhancement and the bar formation in interacting clusters. We find that $f_\mathrm{sf}$ is moderately higher ($\sim20\%$) in interacting clusters than in non-interacting clusters and that the enhancement of star formation in interacting clusters occurs only in moderate-mass disk-dominated galaxies ($10^{10.0} \le M_\mathrm{star}/M_{\odot} < 10^{10.4}$ and the bulge-to-total light ratio is $\le0.5$). We also find that the enhancement of $f_\mathrm{sf}$ in moderate-mass disk-dominated galaxies in interacting clusters is mostly due to the increase of the number of barred galaxies. Our result suggests that the cluster-cluster interaction can simultaneously induce bars and star formation in disk galaxies.

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