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arXiv 0903.1872astro-ph.COastro-ph.GA
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z ~ 2成星半导体的The SINS survey:SINFONI积分场谱

The SINS survey: SINFONI Integral Field Spectroscopy of z ~ 2 Star-forming Galaxies

N. M. Forster Schreiber, R. Genzel, N. Bouche, G. Cresci, R. Davies, P. Buschkamp, K. Shapiro, L. J. Tacconi, E. K. S. Hicks, S. Genel, A. E. Shapley, D. K. Erb… 展开作者

N. M. Forster Schreiber, R. Genzel, N. Bouche, G. Cresci, R. Davies, P. Buschkamp, K. Shapiro, L. J. Tacconi, E. K. S. Hicks, S. Genel, A. E. Shapley, D. K. Erb, C. C. Steidel, D. Lutz, F. Eisenhauer, S. Gillessen, A. Sternberg, A. Renzini, A. Cimatti, E. Daddi, J. Kurk, S. Lilly, X. Kong, M. D. Lehnert, N. Nesvadba, A. Verma, H. McCracken, N. Arimoto, M. Mignoli, M. Onodera

摘要:

本文介绍了用SINFONI对高红移星系的巡天观测。观测到80个天体,探测到63个天体,这是对z~1-3恒星形成星系的空间分辨气体运动学、形态学和物理性质的最大调查。我们描述了目标的选择,观察和数据减少。然后,我们将重点放在62个剩余UV/光学选择源的“Halpha样本”上,在1.3<z<2.6处,我们主要针对Halpha和[NII]发射线。只有30%的样品有以前的近红外光谱观测。总的来说,Halpha样本涵盖了质量log(M*/Msun)>~10的恒星形成星系在z~1.5-2.5的合理代表,由于安全光学红移的要求,与纯K选择样本相比,有些偏向于更蓝的系统。样本跨越两个数量级的恒星质量和绝对和特定的恒星形成率,中值约为log(M*/Msun)= 10.5,70 Msun/yr和3/Gyr。电离气体的分布和运动学的空间分辨尺度范围从1.5 kpc的自适应光学辅助观测到典型的4-5 kpc的可见有限的数据。Halpha形态往往是不规则的和/或聚集的。大约三分之一是旋转主导的湍流盘,另外三分之一包括致密和速度色散主导的物体,其余的星系是明确的相互作用/合并系统;旋转主导系统的比例在样本的更大部分中增加。Halpha光度和等效宽度表明,相对于大部分恒星,HII区域的尘埃衰减平均大约高出两倍,并且当前和过去的平均恒星形成率相当。[摘要]

英文摘要:

We present the SINS survey with SINFONI of high redshift galaxies. With 80 objects observed and 63 detected, SINS is the largest survey of spatially resolved gas kinematics, morphologies, and physical properties of star-forming galaxies at z~1-3. We describe the selection of the targets, the observations, and the data reduction. We then focus on the "SINS Halpha sample" of 62 rest-UV/optically-selected sources at 1.3<z<2.6 for which we targeted primarily the Halpha and [NII] emission lines. Only 30% of this sample had previous near-IR spectroscopic observations. As a whole, the SINS Halpha sample covers a reasonable representation of massive log(M*/Msun)>~10 star-forming galaxies at z~1.5-2.5, with some bias towards bluer systems compared to pure K-selected samples due to the requirement of secure optical redshift. The sample spans two orders of magnitude in stellar mass and in absolute and specific star formation rates, with median values of approximately log(M*/Msun) = 10.5, 70 Msun/yr, and 3/Gyr. The ionized gas distribution and kinematics are spatially resolved on scales ranging from 1.5 kpc for adaptive optics assisted observations to typically 4-5 kpc for seeing-limited data. The Halpha morphologies tend to be irregular and/or clumpy. About one-third are rotation-dominated yet turbulent disks, another third comprises compact and velocity dispersion-dominated objects, and the remaining galaxies are clear interacting/merging systems; the fraction of rotation-dominated systems increases among the more massive part of the sample. The Halpha luminosities and equivalent widths suggest on average roughly twice higher dust attenuation towards the HII regions relative to the bulk of the stars, and comparable current and past-averaged star formation rates. [Abridged]

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