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arXiv 2409.05064astro-ph.GA
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环境效应是塑造恒星形成S0星系的关键因素

Environmental effects as a key factor in shaping star-forming S0 galaxies

Pei-Bin Chen, Junfeng Wang, Yan-Mei Chen, Xiao-Yu Xu, Tian-Wen Cao

AI总结:

本文基于71个SDSS-IV MaNGA SFS0对比高低密度环境,发现环境虽不改变整体结构,却影响恒星形成聚集、气体盘收缩及局域恒星形成强度。

摘要:

透镜星系(S0)的起源可分为两大类:低密度环境(LDE)中的“小并合”和高密度环境(HDE)中的“褪色旋涡星系”。S0演化中的过渡阶段,即恒星形成透镜星系(SFS0),可作为分析不同星系类型之间转变以及恒星形成(SF)熄灭所涉及复杂过程的重要探针。我们试图发现不同环境对SFS0的整体性质和空间分辨物理量的影响。我们从SDSS-IV MaNGA巡天中选出71个SFS0,其中包括23个位于HDE中的SFS0(SFS0s_HE)和48个位于LDE中的SFS0(SFS0s_LE)。我们通过研究整体性质、聚集指数以及导出物理量的径向轮廓,考察了环境效应。SFS0所处环境的不同并未导致整体性质(例如Sérsic指数)出现任何显著差异。通过计算CI_Hα/cont,我们观察到不同环境可能造成不同的SF聚集程度。具体而言,受外部气体并合或内流影响的SFS0s_LE表现出更向中心聚集的SF(即更大的CI_Hα/cont)。这一趋势进一步得到CI_SFR,Hα的支持,该指数只考虑星系的气体盘。这一观测结果与在HDE中受冲压剥离影响的星系所观测到的气体盘收缩相符。此外,它们的Σ_SFR或分辨sSFR具有可比性。平均而言,SFS0s_LE在这两个量上都显示出显著更高的值。最后,观测到的D_n4000和气相金属丰度梯度与其假定起源很好地对应。然而,我们并未在SFS0s_LE中发现显著更低的气相金属丰度。(有删节)

英文摘要:

The origins of lenticular galaxies (S0s) can be classified into two main categories: ``minor mergers" in low-density environments (LDEs) and ``faded spirals" in high-density environments (HDEs). The transitional phase in the evolution of S0s, namely, star-forming lenticular galaxies (SFS0s), can serve as an important probe for analyzing the complex processes involved in the transformation between different galaxy types and the quenching of star formation (SF). We attempt to find the impact of different environments on the global properties and spatially resolved quantities of SFS0s. We selected 71 SFS0s from the SDSS-IV MaNGA Survey, comprising 23 SFS0s in HDEs (SFS0s$\_$HE) and 48 SFS0s in LDEs (SFS0s$\_$LE). We examined the effects of the environment, by studying the global properties, concentration index, and radial profiles of the derived quantities. The varied environments of SFS0s do not lead to any significant difference in global properties (e.g., S$\acute{\rm e}$rsic index). By calculating $CI_{\rm H_α/cont}$, we observe that different environments may cause varying concentrations of SF. Specifically, SFS0s$\_$LE, affected by external gas mergers or inflow, exhibit a more centrally concentrated SF (i.e., larger $CI_{\rm H_α/cont}$). This trend is further supported by $CI_{\rm SFR, H_α}$, which only considers the gas disk of the galaxy. This observation is aligned with the observed shrinking of gas disks in galaxies affected by ram-pressure stripping in HDEs. Furthermore, their $Σ_{\rm SFR}$ or resolved sSFR are comparable. On average, SFS0s$\_$LE display significantly higher values for both quantities. Finally, the observed D$_{\rm n}4000$ and gas-phase metallicity gradient correspond well to their assumed origins. However, we did not find a significantly lower gas-phase metallicity in SFS0s$\_$LE. Abridged

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