THE KMOS3D SURVEY: DESIGN, FIRST RESULTS, AND THE EVOLUTION OF GALAXY KINEMATICS FROM 0.7 ⩽ z ⩽ 2.7
THE KMOS3D SURVEY: DESIGN, FIRST RESULTS, AND THE EVOLUTION OF GALAXY KINEMATICS FROM 0.7 ⩽ z ⩽ 2.7
复制标题
DOI：
10.1088/0004-637x/799/2/209
复制
发表时间：
2014-09
期刊：
影响因子：
--
通讯作者：
E. Wisnioski;N. F. Schreiber;S. Wuyts;E. Wuyts;K. Bandara;D. Wilman;R. Genzel;R. Bender;R. Da
中科院分区：
文献类型：
--
作者：
E. Wisnioski;N. F. Schreiber;S. Wuyts;E. Wuyts;K. Bandara;D. Wilman;R. Genzel;R. Bender;R. Da
我们提出了KMOS3D巡天，这是一项对超过600个星系在0.7 - 1波段进行的新的积分场巡天，这意味着恒星形成的“主序”主要由两个红移区域的旋转星系组成。当考虑更严格的标准时，Hα运动学图表明，至少70%的已分解星系是盘状系统。我们高质量的KMOS数据证实了先前积分场光谱研究中报道的z≥0.7的速度色散升高。对于旋转为主的圆盘，平均固有速度色散从50 km s - 1at z ~ 2.3降低到25 km s - 1at z ~ 0.9，降低了2倍。结合现有的跨越z ~ 0-3的结果，我们表明，磁盘速度色散遵循的演化与边际稳定磁盘理论预测的速度色散对气体组分的依赖一致。
We present the KMOS3D survey, a new integral field survey of over 600 galaxies at 0.7 1, implying that the star-forming “main sequence” is primarily composed of rotating galaxies at both redshift regimes. When considering additional stricter criteria, the Hα kinematic maps indicate that at least ∼70% of the resolved galaxies are disk-like systems. Our high-quality KMOS data confirm the elevated velocity dispersions reported in previous integral field spectroscopy studies at z ≳ 0.7. For rotation-dominated disks, the average intrinsic velocity dispersion decreases by a factor of two from 50 km s−1at z ∼ 2.3 to 25 km s−1at z ∼ 0.9. Combined with existing results spanning z ∼ 0–3, we show that disk velocity dispersions follow an evolution that is consistent with the dependence of velocity dispersion on gas fractions predicted by marginally stable disk theory.