论文标题
相互作用的星系簇中禁止磁盘星系的星形星系增强
Star Formation Enhancement in Barred Disk Galaxies in Interacting Galaxy Clusters
论文作者
论文摘要
最近的一项研究表明，可以通过星系簇的相互作用诱导条形，但是尚不清楚簇之间的相互作用与恒星形成的增强有关。我们从斯隆数字天空调查数据中检测到的105个星系簇中的星系簇在$ 0.015 <z <0.060 $中，以检查与其他不可能的连接相比，在16个相互作用的簇中是否可以增强16个相互作用的簇中的星形星系（$ f_ \ mathrm {sf} $）的比例。 $ f_ \ mathrm {sf} $ Enhancement和bar组形成在交互群集中。我们发现$ f_ \ mathrm {sf} $在交互群集中比非相互作用的簇中等（$ \ sim20 \％$）高，并且相互作用的簇中星形形成在相互作用的群集中的增强仅在中度磁盘盘中的磁盘为主的星系（$ 10^{10.0^{10.0^{10.0^{10.0^{10.0}）中。 m_ \ mathrm {star}/m _ {\ odot} <10^{10.4} $，而凸起的光比为$ \ le0.5 $）。我们还发现，在相互作用的簇中，中等质量磁盘主导的星系中$ f_ \ mathrm {sf} $的增强主要是由于禁止星系的数量增加。我们的结果表明，集群群集相互作用可以同时诱导磁盘星系中的条和恒星形成。
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.
