The KMOS Deep Survey (KDS) - I. Dynamical measurements of typical star-forming galaxies at z ≃ 3.5
The KMOS Deep Survey (KDS) - I. Dynamical measurements of typical star-forming galaxies at z ≃ 3.5
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DOI：
10.1093/mnras/stx1366
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发表时间：
2017-04
影响因子：
4.8
通讯作者：
O. Turner;M. Cirasuolo;C. Harrison;R. McLure;J. Dunlop;A. M. Swinbank;H. Johnson;D. Sobral;
中科院分区：
文献类型：
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作者：
O. Turner;M. Cirasuolo;C. Harrison;R. McLure;J. Dunlop;A. M. Swinbank;H. Johnson;D. Sobral;
本文介绍了KMOS（K波段多目标摄谱仪）深度巡天（KDS）的动力学测量结果，KDS由77个典型的恒星形成星系组成，质量范围为9.0 1），z $\simeq $3.5，样本平均V$_{C}$/{\sigma}$_{int}$值远小于低红移。在仔细选择了多个历元的可比恒星形成样本后，我们发现旋转占主导地位的分数随红移的z$^{-0.2}$依赖性而演化。旋转主导的KDS星系没有显示出明显的偏离局部旋转速度-恒星质量（即V${C}$-M${\星星}$）关系，尽管由于色散主导的部分增加，有一小部分星系处于该关系中。这些意见是一致的一个简单的平衡模型的图片，在高红移星系中的随机运动，提高气体分数的组合，吸积效率，特定的恒星形成率和恒星反馈，并可能提供显着的压力支持对银河系盘尺度上的重力。
We present dynamical measurements from the KMOS (K-band Multi-Object Spectrograph) Deep Survey (KDS), which is comprised of 77 typical star-forming galaxies at z $\simeq$ 3.5 in the mass range 9.0 1), with the sample average V$_{C}$/{\sigma}$_{int}$ value much smaller than at lower redshift. After carefully selecting comparable star-forming samples at multiple epochs, we find that the rotation-dominated fraction evolves with redshift with a z$^{-0.2}$ dependence. The rotation-dominated KDS galaxies show no clear offset from the local rotation velocity-stellar mass (i.e. V$_{C}$-M$_{\star}$) relation, although a smaller fraction of the galaxies are on the relation due to the increase in the dispersion-dominated fraction. These observations are consistent with a simple equilibrium model picture, in which random motions are boosted in high redshift galaxies by a combination of the increasing gas fractions, accretion efficiency, specific star-formation rate and stellar feedback and which may provide significant pressure support against gravity on the galactic disk scale.