论文标题
与星系动力学在小尺度上测试的丰度匹配
Abundance matching tested on small scales with galaxy dynamics
论文作者
论文摘要
我们对基于丰度匹配（AM）技术的流行模型预测的星系中恒星和总质量之间的关系进行了全面测试。我们使用``处女座星系星系的光谱和H波段成像''（Shivir）调查，用于190个处女座聚类星系的光度和动力学轮廓，以建立在同层半径$ R_ {23.5} $中测得的恒星和动力质量之间的关系。各种暗物质和星系缩放关系与Nihao套件的结果相结合，以根据这些观察到的数量重新铸造AM预测。我们的结果对暗物质概况的确切选择和对Baryon崩溃的响应的确切选择非常不敏感。我们发现，理论模型在恒星质量$ $（10^8 <m _*/m _*/m _ {\ odot} <2 \ 2 \ 2 \ 2 \ 2 \ times 10^{11}）中，在超过三个数量级上重现了观察到的恒星至中心质量关系（SHMR）的斜率和归一化。但是，所观察到的SHMR的散布超过了AM预测的散布，$ \ sim $ 5。对于具有恒星质量的系统，超过$ 5 \ times 10^{10} 〜M _ {\ odot} $，AM预测给定的动态质量的观察到的恒星质量。后一个偏移可能支持以前的这些大型星系中不同恒星初始质量功能的指示。总体而言，我们的结果支持AM预测在广泛的动态范围内的有效性。
We present a comprehensive test of the relation between stellar and total mass in galaxies as predicted by popular models based on abundance matching (AM) techniques. We use the ``Spectroscopy and H-band Imaging of Virgo cluster galaxies'' (SHIVir) survey with photometric and dynamical profiles for 190 Virgo cluster galaxies to establish a relation between the stellar and dynamical masses measured within the isophotal radius $r_{23.5}$. Various dark matter and galaxy scaling relations are combined with results from the NIHAO suite of hydrodynamical simulations to recast AM predictions in terms of these observed quantities. Our results are quite insensitive to the exact choice of dark matter profile and halo response to baryon collapse. We find that theoretical models reproduce the slope and normalization of the observed stellar-to-halo mass relation (SHMR) over more than three orders of magnitude in stellar mass $(10^8 < M_*/M_{\odot} < 2 \times 10^{11})$. However, the scatter of the observed SHMR exceeds that of AM predictions by a factor $\sim$5. For systems with stellar masses exceeding $5 \times 10^{10}~M_{\odot}$, AM overpredicts the observed stellar masses for a given dynamical mass. The latter offset may support previous indications of a different stellar initial mass function in these massive galaxies. Overall our results support the validity of AM predictions on a wide dynamical range.
