论文标题
部分可观测时空混沌系统的无模型预测
The Contribution of In-situ and Ex-situ Star Formation in Early-Type Galaxies: MaNGA versus IllustrisTNG
论文作者
论文摘要
We compare stellar mass surface density, metallicity, age, and line-of-sight velocity dispersion profiles in massive ($M_*\geq10^{10.5}\,\mathrm{M_\odot}$) present-day early-type galaxies (ETGs) from the MaNGA survey with simulated galaxies from the TNG100 simulation of the IllustrisTNG suite.我们发现漫画和TNG100 ETG的恒星质量表面密度曲线在形状和归一化之间都有很大的一致性。此外，TNG100再现了恒星金属性和年龄的形状，以及漫画ETG的速度分布分布的归一化。在比较漫画和TNG100之间的中央和卫星星系的恒星曲线时，我们通常还可以找到良好的一致性。一个例外是非常巨大（$ M _*\ gtrsim10^{11.5} \，\ Mathrm {M _ \ odot} $）中央星系的速度分散曲线，平均而言，TNG100在TNG100中平均高于Manga（$ \ \ \ 50 \ ymathrmmathrmmathrmmmathrmmmathrmmmatrm {我们研究了$ \ Mathit {in} $ - $ \ Mathit {situ} $和$ \ Mathit {ex} $ - $ \ $ \ Mathit {situ} $ start in TNG100中的径向配置文件，并讨论每个人群对观察到的漫画配置文件的贡献的程度。我们的分析对这样的想法有很大的支持，即当今宇宙中高质量（$ m _*\ gtrsim10^{11} \，\ mathrm {m_ \ odot} $）Etgs Etgs是由合并驱动的进化所标记的主要合并所标记的主要合并标记的结果，该主要合并倾向于趋于同一性的后代群体，而该商品均可依次使用Quenlar serellar selellar sellar的商人。
We compare stellar mass surface density, metallicity, age, and line-of-sight velocity dispersion profiles in massive ($M_*\geq10^{10.5}\,\mathrm{M_\odot}$) present-day early-type galaxies (ETGs) from the MaNGA survey with simulated galaxies from the TNG100 simulation of the IllustrisTNG suite. We find an excellent agreement between the stellar mass surface density profiles of MaNGA and TNG100 ETGs, both in shape and normalisation. Moreover, TNG100 reproduces the shapes of the profiles of stellar metallicity and age, as well as the normalisation of velocity dispersion distributions of MaNGA ETGs. We generally also find good agreement when comparing the stellar profiles of central and satellite galaxies between MaNGA and TNG100. An exception is the velocity dispersion profiles of very massive ($M_*\gtrsim10^{11.5}\,\mathrm{M_\odot}$) central galaxies, which, on average, are significantly higher in TNG100 than in MaNGA ($\approx50\,\mathrm{km\,s^{-1}}$). We study the radial profiles of $\mathit{in}$-$\mathit{situ}$ and $\mathit{ex}$-$\mathit{situ}$ stars in TNG100 and discuss the extent to which each population contributes to the observed MaNGA profiles. Our analysis lends significant support to the idea that high-mass ($M_*\gtrsim10^{11}\,\mathrm{M_\odot}$) ETGs in the present-day Universe are the result of a merger-driven evolution marked by major mergers that tend to homogenise the stellar populations of the progenitors in the merger remnant.
