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arXiv 2201.10576astro-ph.GA
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VANDELS和LEGA-C联合研究：从$\mathbf{\textit{z} = 0.6}$到$\mathbf{\textit{z} = 1.3}$静止星系大小、恒星质量和年龄的演化

A combined VANDELS and LEGA-C study: the evolution of quiescent galaxy size, stellar mass and age from $\mathbf{\textit{z} = 0.6}$ to $\mathbf{\textit{z} = 1.3}$

M. L. Hamadouche, A. C. Carnall, R. J. McLure, J. S. Dunlop, D. J. McLeod, F. Cullen, R. Begley, M. Bolzonella, F. Buitrago, M. Castellano, O. Cucciati, A. Font… 展开作者

M. L. Hamadouche, A. C. Carnall, R. J. McLure, J. S. Dunlop, D. J. McLeod, F. Cullen, R. Begley, M. Bolzonella, F. Buitrago, M. Castellano, O. Cucciati, A. Fontana, A. Gargiulo, M. Moresco, L. Pozzetti, G. Zamorani

备注：
14 pages, 9 figures, submitted to MNRAS
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摘要：

我们研究恒星的质量，大小和年龄之间的关系在静态人口，使用两个质量完整的光谱样品与$\mathrm{log_{10}}(M_{\star}/\mathrm{M_{\odot}})>10.3$，从范德尔在$1.0<z<1.3$，和LEGA-C在$0.6<z<0.8$。使用稳健的D $_{n}$ 4000值，我们证明了众所周知的“缩小”特征已经通过$z\simeq1.1$就位，对于VANDELS和LEGA-C，在$\simeq$ 1 dex质量间隔内，D $_{n}$ 4000通过$\simeq0.1$增加。然后，我们继续调查的演变的静态星系恒星质量-尺寸关系从$z\simeq1.1$ $z\simeq0.7$。我们发现，在$\mathrm{log_{10}}(M_{\star}/\mathrm{M_{\odot}})=10.5$时，中位尺寸增加了一个$1.9\pm{0.1}$的因子，并看到了该关系变平的初步证据，分别发现VANDELS和LEGA-C的$α=0.72\pm0.06$和$α=$ $0.56\pm0.04$的斜率。最后，我们将样本分成高于和低于我们拟合的质量-尺寸关系的星系，以研究尺寸和D $_{n}$ 4000之间的相关性。对于LEGA-C，我们看到了一个明显的差异，在固定的恒星质量下，较大的星系具有较小的D $_{n}$ 4000。由于VANDELS样本的模糊性和较小的数量，我们无法确认在$z\simeq1.1$是否存在类似的关系。我们考虑恒星年龄或金属丰度的差异是否最有可能驱动这种尺寸为D的$_{n}$ 4000关系，发现任何金属丰度差异都不太可能完全解释观察到的偏移，这意味着较小的星系必须比较大的星系更老。我们发现所观察到的演变的大小，质量和D $_{n}$ 4000整个$\simeq2$陀螺仪从$z\sim1.1$ $z\sim0.7$可以解释一个简单的玩具模型中，范德尔星系被动地演变，同时经历了一系列轻微的合并。

英文摘要：

We study the relationships between stellar mass, size and age within the quiescent population, using two mass-complete spectroscopic samples with $\mathrm{log_{10}}(M_{\star}/\mathrm{M_{\odot}})>10.3$, taken from VANDELS at $1.0<z<1.3$, and LEGA-C at $0.6<z<0.8$. Using robust D$_{n}$4000 values, we demonstrate that the well-known 'downsizing' signature is already in place by $z\simeq1.1$, with D$_{n}$4000 increasing by $\simeq0.1$ across a $\simeq$ 1 dex mass interval for both VANDELS and LEGA-C. We then proceed to investigate the evolution of the quiescent galaxy stellar mass-size relation from $z\simeq1.1$ to $z\simeq0.7$. We find the median size increases by a factor of $1.9\pm{0.1}$ at $\mathrm{log_{10}}(M_{\star}/\mathrm{M_{\odot}})=10.5$, and see tentative evidence for flattening of the relation, finding slopes of $α=0.72\pm0.06$ and $α=$ $0.56\pm0.04$ for VANDELS and LEGA-C respectively. We finally split our sample into galaxies above and below our fitted mass-size relations, to investigate how size and D$_{n}$4000 correlate. For LEGA-C, we see a clear difference, with larger galaxies found to have smaller D$_{n}$4000 at fixed stellar mass. Due to the faintness and smaller numbers of the VANDELS sample, we cannot confirm whether a similar relation exists at $z\simeq1.1$. We consider whether differences in stellar age or metallicity are most likely to drive this size-D$_{n}$4000 relation, finding that any metallicity differences are unlikely to fully explain the observed offset, meaning smaller galaxies must be older than their larger counterparts. We find the observed evolution in size, mass and D$_{n}$4000 across the $\simeq2$ Gyr from $z\sim1.1$ to $z\sim0.7$ can be explained by a simple toy model in which VANDELS galaxies evolve passively, whilst experiencing a series of minor mergers.

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