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arXiv 1802.07276astro-ph.GA
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z~2星系运动学的SINS/zC-SINF巡天:SINFONI自适应光学辅助数据和千秒秒尺度发射线性质

The SINS/zC-SINF survey of z~2 galaxy kinematics: SINFONI adaptive optics-assisted data and kiloparsec-scale emission line properties

N. M. Förster Schreiber, A. Renzini, C. Mancini, R. Genzel, N. Bouché, G. Cresci, E. K. S. Hicks, S. J. Lilly, Y. Peng, A. Burkert, C. M. Carollo, A. Cimatti, E… 展开作者

N. M. Förster Schreiber, A. Renzini, C. Mancini, R. Genzel, N. Bouché, G. Cresci, E. K. S. Hicks, S. J. Lilly, Y. Peng, A. Burkert, C. M. Carollo, A. Cimatti, E. Daddi, R. I. Davies, S. Genel, J. D. Kurk, P. Lang, D. Lutz, V. Mainieri, H. J. McCracken, M. Mignoli, T. Naab, P. Oesch, L. Pozzetti, M. Scodeggio, K. Shapiro Griffin, A. E. Shapley, A. Sternberg, S. Tacchella, L. J. Tacconi, S. Wuyts, G. Zamorani

摘要:

我们提出了35个恒星形成星系,最大的样本与深自适应光学辅助(AO)近红外积分场光谱在z~2的“ZH/zC-SINF AO调查”。在甚大望远镜上用SINFONI进行的观测,在~1.5 kpc的尺度上分辨了Ha和[NII]线的发射和运动学。在恒星质量、恒星形成率、静止光学颜色和大小方面,AO样品代表了其母恒星的视限样品,并探测了大质量的(M* ~ 2x10^9 - 3x10^11 Msun),活跃的恒星形成(SFR ~ 10-600 Msun/yr)是z~2星系群的一部分,其颜色((U-V)_rest ~ 0.15-1.5等)和半光半径(R_e,H ~ 1-8.5 kpc)范围很广。该样本与恒星形成星系的“主序列”在相同的红移范围内有很大的重叠,K_AB = 23等极限;它具有约0.3倍的高中值比SFR,约0.1等的蓝中值(U-V)_rest颜色,和约10%的中值静止光学尺寸。我们描述的意见,数据减少,并提取基本通量和运动学特性。与相同物体的可见受限数据集相比,AO数据通常具有3-4倍的分辨率和4-5倍的积分时间(长达23小时),在形态学和运动学方面揭示了更多的细节。现在完整的AO观测证实了大多数运动学分类的磁盘和通常升高磁盘速度分散先前报告的数据子集的基础上。我们得到典型的平坦或略负的径向[NII]/Ha梯度,没有显着的趋势与全球星系的属性,运动学性质,或AGN的存在。[NII]/Ha的方位角变化可以在几个来源中看到,并且与电离气体流出有关,可能还有更多贫金属的恒星形成团块或小伴星。[删节]

英文摘要:

We present the "SINS/zC-SINF AO survey" of 35 star-forming galaxies, the largest sample with deep adaptive optics-assisted (AO) near-infrared integral field spectroscopy at z~2. The observations, taken with SINFONI at the Very Large Telescope, resolve the Ha and [NII] line emission and kinematics on scales of ~1.5 kpc. In stellar mass, star formation rate, rest-optical colors and size, the AO sample is representative of its parent seeing-limited sample and probes the massive (M* ~ 2x10^9 - 3x10^11 Msun), actively star-forming (SFR ~ 10-600 Msun/yr) part of the z~2 galaxy population over a wide range in colors ((U-V)_rest ~ 0.15-1.5 mag) and half-light radii (R_e,H ~ 1-8.5 kpc). The sample overlaps largely with the "main sequence" of star-forming galaxies in the same redshift range to a similar K_AB = 23 magnitude limit; it has ~0.3 dex higher median specific SFR, ~0.1 mag bluer median (U-V)_rest color, and ~10% larger median rest-optical size. We describe the observations, data reduction, and extraction of basic flux and kinematic properties. With typically 3-4 times higher resolution and 4-5 times longer integrations (up to 23hr) than the seeing-limited datasets of the same objects, the AO data reveal much more detail in morphology and kinematics. The now complete AO observations confirm the majority of kinematically-classified disks and the typically elevated disk velocity dispersions previously reported based on subsets of the data. We derive typically flat or slightly negative radial [NII]/Ha gradients, with no significant trend with global galaxy properties, kinematic nature, or the presence of an AGN. Azimuthal variations in [NII]/Ha are seen in several sources and are associated with ionized gas outflows, and possible more metal-poor star-forming clumps or small companions. [Abridged]

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