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arXiv 2104.03099astro-ph.GA
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ALPINE-ALMA [ CII ]巡天:z~4.4-5.9大质量恒星形成星系的运动学多样性和旋转

The ALPINE-ALMA [CII] Survey: Kinematic Diversity & Rotation in Massive Star Forming Galaxies at z~4.4-5.9

G. C. Jones, D. Vergani, M. Romano, M. Ginolfi, Y. Fudamoto, M. Bethermin, S. Fujimoto, B. C. Lemaux, L. Morselli, P. Capak, P. Cassata, A. Faisst, O. Le Fevre,… 展开作者

G. C. Jones, D. Vergani, M. Romano, M. Ginolfi, Y. Fudamoto, M. Bethermin, S. Fujimoto, B. C. Lemaux, L. Morselli, P. Capak, P. Cassata, A. Faisst, O. Le Fevre, D. Schaerer, J. D. Silverman, Lin Yan, M. Boquien, A. Cimatti, M. Dessauges-Zavadsky, E. Ibar, R. Maiolino, F. Rizzo, M. Talia, G. Zamorani

摘要:

虽然z~3以下星系的运动学已经被详细地描述过,但只有少数高红移星系(z>4)被这样研究过。阿塔卡马大型毫米/亚毫米阵列(ALMA)早期[CII]大型研究计划(ALPINE)观测到了118个恒星形成的主序星星系的统计显著样本,在[CII] 158 μ m发射中z=4.4-5.9,使此类观测的数量增加了近10倍。这些来源的初步定性分类揭示了运动学类型的多样性(即,旋转器、合并器和分散主导系统)。在这项工作中,我们补充了初始分类应用定量分析的ALPINE数据:倾斜环模型(TRM)拟合代码(3DBarolo),形态分类(Gini-M20),和一组磁盘识别标准。在75个[CII]检测到的ALPINE星系中,有29个以足够的显著性和空间分辨率检测到,以允许TRM拟合和推导形态学和运动学参数。这29个来源构成了ALPINE样本的高质量子集(M_*>10^9.5Msol)。我们强大的分类14这些来源(6个旋转,5个合并,和三个分散为主的系统),其余的来源表现出复杂的行为。通过对z>4静止帧的G-M_(20)的FIR和[CII]数据的首次研究,我们发现单靠我们的1”~ 6 kpc分辨率数据不足以区分星系类型。我们比较了这6个ALPINE旋光子和两个先前探测到的z~4-6非透镜主序星的自转曲线和动力学质量分布,发现它们的自转速度很高(~50- 250 km/s),自转曲线形状也很多样。

英文摘要:

While the kinematics of galaxies up to z~3 have been characterized in detail, only a handful of galaxies at high redshift (z>4) have been examined in such a way. The Atacama Large Millimeter/submillimeter Array (ALMA) Large Program to INvestigate [CII] at Early times (ALPINE) survey observed a statistically significant sample of 118 star-forming main sequence galaxies at z=4.4-5.9 in [CII]158um emission, increasing the number of such observations by nearly 10x. A preliminary qualitative classification of these sources revealed a diversity of kinematic types (i.e., rotators, mergers, and dispersion-dominated systems). In this work, we supplement the initial classification by applying quantitative analyses to the ALPINE data: a tilted ring model (TRM) fitting code (3DBarolo), a morphological classification (Gini-M20), and a set of disk identification criteria. Of the 75 [CII]-detected ALPINE galaxies, 29 are detected at sufficient significance and spatial resolution to allow for TRM fitting and the derivation of morphological and kinematic parameters. These 29 sources constitute a high-mass subset of the ALPINE sample (M_*>10^9.5Msol). We robustly classify 14 of these sources (six rotators, five mergers, and three dispersion-dominated systems); the remaining sources showing complex behaviour. By exploring the G-M20 of z>4 rest-frame FIR and [CII] data for the first time, we find that our 1"~6kpc resolution data alone are insufficient to separate galaxy types. We compare the rotation curves and dynamical mass profiles of the six ALPINE rotators to the two previously detected z~4-6 unlensed main sequence rotators, finding high rotational velocities (~50-250km/s) and a diversity of rotation curve shapes.

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