KMOS红移一光谱巡天（KROSS）：z ~ 1处的Tully-Fisher关系
The KMOS Redshift One Spectroscopic Survey (KROSS): The Tully-Fisher Relation at z ~ 1
摘要：
本文给出了584个星系子样本的恒星质量（$M_{*}$）和K-校正的$K$ -波段绝对星等（$M_{K}$）Tully-Fisher关系（TFR）。我们模拟的速度场的KROSS星系和提取的旋转速度，$V_{80}$在半径等于椭圆的长轴包含80%的总集成H $α$流量。KROSS的大样本量使我们能够选择210个具有良好测量旋转速度的星系。我们从这个样本中提取另外56个星系旋转支持，使用严格的标准$V_{80}/σ> 3$，其中$σ$是通量加权平均速度色散。我们发现该子样本的$M_{K}$和$M_{*}$ TFR分别为$M_{K} / \rm{mag}= (-7.3 \pm 0.9) \times [(\log(V_{80}/\rm{km\ s^{-1}})-2.25]- 23.4 \pm 0.2$和$\log(M_{*} / M_{\odot})= (4.7 \pm 0.4) \times [(\log(V_{80}/\rm{km\ s^{-1}}) - 2.25] + 10.0 \pm 0.3$。我们发现在过去的$\sim $ 80亿年中，$-0.41 \pm 0.08$ dex的$M_{*}$ TFR零点的演化。然而，我们在同一时期内没有测量到$M_{K}$ TFR零点的演变。我们的结论是，旋转支撑的星系，一个给定的动力学质量有较小的恒星质量在$z \sim 1$比现在的一天，但发出同样数量的$K$波段的光。KROSS的能力，区分，使用积分场光谱与KMOS，这些星系之间的旋转支持和那些不解释为什么我们的研究结果是不一致的，与以前的研究没有相同的能力。
英文摘要：
We present the stellar mass ($M_{*}$), and K-corrected $K$-band absolute magnitude ($M_{K}$) Tully-Fisher relations (TFRs) for sub-samples of the 584 galaxies spatially resolved in H$α$ emission by the KMOS Redshift One Spectroscopic Survey (KROSS). We model the velocity field of each of the KROSS galaxies and extract a rotation velocity, $V_{80}$ at a radius equal to the major axis of an ellipse containing 80% of the total integrated H$α$ flux. The large sample size of KROSS allowed us to select 210 galaxies with well measured rotation speeds. We extract from this sample a further 56 galaxies that are rotationally supported, using the stringent criterion $V_{80}/σ> 3$, where $σ$ is the flux weighted average velocity dispersion. We find the $M_{K}$ and $M_{*}$ TFRs for this sub-sample to be $M_{K} / \rm{mag}= (-7.3 \pm 0.9) \times [(\log(V_{80}/\rm{km\ s^{-1}})-2.25]- 23.4 \pm 0.2$ , and $\log(M_{*} / M_{\odot})= (4.7 \pm 0.4) \times [(\log(V_{80}/\rm{km\ s^{-1}}) - 2.25] + 10.0 \pm 0.3$, respectively. We find an evolution of the $M_{*}$ TFR zero-point of $-0.41 \pm 0.08$ dex over the last $\sim $8 billion years. However, we measure no evolution in the $M_{K}$ TFR zero-point over the same period. We conclude that rotationally supported galaxies of a given dynamical mass had less stellar mass at $z \sim 1$ than the present day, yet emitted the same amounts of $K$-band light. The ability of KROSS to differentiate, using integral field spectroscopy with KMOS, between those galaxies that are rotationally supported and those that are not explains why our findings are at odds with previous studies without the same capabilities.
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