The Multi-object Spectroscopy Observation of Seven Interacting Galaxy Pairs: Metallicity Gradients and Star Formation Distributions

The Multi-object Spectroscopy Observation of Seven Interacting Galaxy Pairs: Metallicity Gradients and Star Formation Distributions
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七个相互作用星系对的多目标光谱观测:金属丰度梯度和恒星形成分布

DOI:
10.1088/1538-3873/ab6714
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发表时间:
2020-01
影响因子:
3.5
通讯作者:
Wu Hong
Wu Hong
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhang Bing-qing;Cao Chen;Xu Cong K.;Zhou Zhi-min;Wu Hong

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我们利用兴隆2.16米望远镜的多目标光谱系统研究了7对邻近相互作用星系的气相氧丰度梯度以及恒星形成活动的分布。基于发射线光度和流量比,我们估算了每个星系不同区域的气相金属丰度(log(O/H))、激发机制以及恒星形成率(SFRs)。我们样本中星系对线性拟合得到的log(O/H)平均径向斜率明显比孤立盘状星系的更平缓,而且相互作用星系的中心金属丰度要低得多。这支持了先前理论数值模拟和观测工作的预测及结果,这些研究表明星系相互作用引发的冷气体流入会稀释中心金属丰度。通过对恒星形成率面密度(σ(SFR))径向分布的分析,我们发现在我们的样本中,螺旋 - 螺旋(S + S)对中的星系在中心区域具有σ(SFR)峰值,且外部区域的恒星形成率比中心区域低。另一方面,对于螺旋 - 椭圆(S + E)对中的两个螺旋星系(Arp142和J0338 + 2120),它们在核外区域都具有相对较高的σ(SFR)。这可能暗示成对星系的恒星形成分布与其伴星系的形态有关。
We use the Multi-Object Spectroscopy system of Xinglong 2.16 m telescope to study the gradients of gas-phase oxygen abundance and the distributions of star formation activities of seven nearby interacting galaxy pairs. On the basis of emission line luminosities and flux ratios, we estimate the gas-phase metallicities (log(O/H)), excitation mechanisms, and star formation rates (SFRs) of different regions in each galaxy. The average radial slope of log(O/H) from linear fitting of galaxy pairs in our sample is significantly flatter than that of isolated disk galaxies, also the central metallicity is much lower for interacting galaxies. This supports the predictions and results of previous theoretical numerical simulations and observational works which show the cold gas inflows induced by galaxy interactions can dilute the central metallicity. From the analysis of the radial distribution of SFR surface densities (sigma(SFR)), we find that, in our sample, galaxies in Spiral-Spiral (S+S) pairs have peak sigma(SFR) at the center region and lower SFRs at the outer parts than that at the center. On the other hand, for two spirals in Spiral-Elliptical (S+E) pairs (Arp142 and J0338+2120), they both have relatively higher (sigma(SFR)) in their off-nuclei regions. This may hint a dependence of star formation distributions for paired galaxies on their companion morphologies.
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