论文标题
大规模静止和星形星系的速度分散功能为0.6 $ <$ <$ z $ \ leq $ 1.0
The Velocity Dispersion Function for Massive Quiescent and Star-Forming Galaxies at 0.6 $<$ z $\leq$ 1.0
论文作者
论文摘要
我们介绍了恒星速度分散函数（VDF）的第一个直接光谱测量，用于$ 0.6 <z \ leq 1.0 $，以大规模静止和恒星形成星系。在此分析中，我们使用了公共大型早期星系人口普查（LEGA-C）调查的高S/N光谱的恒星速度分散体的单个测量值。我们报告了VDF在此红移范围内的静态和恒星形成星系的显着稳定性，尽管我们注意到恒星形成星系的数量密度较弱。我们将两个VDF与局部和中间红移的先前直接和推断测量值进行了比较，并且需要在所有时期对恒星形成星系的先前测量对星形成星系的测量受到限制。我们强调的是，这项工作是第一个直接推向低星速度分散体（$σ_\ star> 100 $ km s $^{ - 1} $）并扩展到星形的星系。我们在很大程度上与从老板测得的高尾尾相一致，我们发现VDF从Lega-C，$ z \ sim0.8 $的中间红移到今天保持不变。
We present the first direct spectroscopic measurement of the stellar velocity dispersion function (VDF) for massive quiescent and star-forming galaxies at $0.6 < z \leq 1.0$. For this analysis we use individual measurements of stellar velocity dispersion from high-S/N spectra from the public Large Early Galaxy Astrophysics Census (LEGA-C) survey. We report a remarkable stability of the VDF for both quiescent and star-forming galaxies within this redshift range, though we note the presence of weak evolution in the number densities of star-forming galaxies. We compare both VDFs with previous direct and inferred measurements at local and intermediate redshifts, with the caveat that previous measurements of the VDF for star-forming galaxies are poorly constrained at all epochs. We emphasize that this work is the first to directly push to low-stellar velocity dispersion ($σ_\star > 100$ km s$^{-1}$) and extend to star-forming galaxies. We are largely consistent with the high-sigma tail measured from BOSS, and we find that the VDF remains constant from the median redshift of LEGA-C, $z\sim0.8$, to the present day.
