论文标题
Simba中Baryonic Tully-Fisher关系的红移演变
The redshift evolution of the baryonic Tully-Fisher relation in Simba
论文作者
论文摘要
Baryonic Tully-Fisher关系（BTFR）是限制星系演化模型的重要工具。由于21 cm HI的排放研究在很大程度上仅限于低红移，因此对BTFR的红移演变的研究较少。即将进行的Laduma调查（查看Meerkat阵列的遥远宇宙）将解决此问题。作为准备Laduma，我们使用Simba-Hires（25 H $^{ - 1} $ MPC）$^{3} $运行的Simba流体动力学星系模拟模拟（25 H $^{ - 1} $ MPC）$从星系旋转曲线（$ v _ {$ v _ {\ rm flat} $）$ 50s（$ v _ {\ rm flat} $ wids（$ w pluts）（$ v _） $ w _ {\ rm 20} $）在三种不同的红移（$ z $ = 0、0.5和1）处。使用这些度量，以及暗物质速度分散和光晕质量，我们考虑了Simba星系BTFR的红移演化。我们发现，Laduma将成功地检测BTFR的弱红移演化，但前提是辅助数据用于区分散落形态的星系。 $ w _ {\ rm 20} $光谱线宽度与$ w _ {\ rm 50} $相比，散布较低和更明显的红移进化。我们还将这些旋转速度度量与跨红移和星系形态的暗物质速度分散相提并论。我们发现旋转速度和暗物质光环质量之间的红移弱演变，并为估计来自HI光谱线宽度的星系的暗物质光环质量提供了拟合。这项与SIMBA的研究展示了即将进行的，深层SKA探路者调查（如Laduma）的重要性，并提供了与HI旋转速度测量中BTFR和Galaxy暗物质含量相比的预测。
The baryonic Tully-Fisher relation (BTFR) is an important tool for constraining galaxy evolution models. As 21-cm HI emission studies have been largely restricted to low redshifts, the redshift evolution of the BTFR is less studied. The upcoming LADUMA survey (Looking At the Distant Universe with the MeerKAT Array) will address this. As preparation for LADUMA, we use the Simba hydrodynamical galaxy formation simulation from the Simba-hires (25 h$^{-1}$ Mpc)$^{3}$ run to generate rotational velocity measures from galaxy rotation curves ($V_{\rm flat}$) and HI spectral line profile widths ($W_{\rm 50}$ and $W_{\rm 20}$) at three different redshifts ($z$ = 0, 0.5, and 1). Using these measures, together with the dark matter velocity dispersion and halo mass, we consider the redshift evolution of the BTFR of Simba galaxies. We find that LADUMA will be successful in detecting weak redshift evolution of the BTFR, provided that auxiliary data is used to distinguish galaxies with disky morphologies. $W_{\rm 20}$ spectral line widths give lower scatter and more pronounced redshift evolution compared to $W_{\rm 50}$. We also compare these rotational velocity measures to the dark matter velocity dispersion across redshift and galaxy morphology. We find weak redshift evolution between rotational velocity and the dark matter halo mass, and provide fits for estimating a galaxy's dark matter halo mass from HI spectral line widths. This study with Simba showcases the importance of upcoming, deep SKA pathfinder surveys such as LADUMA, and provides predictions to compare with redshift evolution of the BTFR and galaxy dark matter content from HI rotational velocity measures.
