arXiv 0810.22452008-10-13astro-ph

zCOSMOS红移巡天：星系物理性质的三维分类立方体和双峰性

The zCOSMOS redshift survey: the three-dimensional classification cube and bimodality in galaxy physical properties

M. Mignoli, G. Zamorani, M. Scodeggio, A. Cimatti, C. Halliday, S. J. Lilly, L. Pozzetti, D. Vergani, C. M. Carollo, T. Contini, O. Le Fevre, V. Mainieri, A. Re… 展开作者

M. Mignoli, G. Zamorani, M. Scodeggio, A. Cimatti, C. Halliday, S. J. Lilly, L. Pozzetti, D. Vergani, C. M. Carollo, T. Contini, O. Le Fevre, V. Mainieri, A. Renzini, S. Bardelli, M. Bolzonella, A. Bongiorno, K. Caputi, G. Coppa, O. Cucciati, S. de la Torre, L. de Ravel, P. Franzetti, B. Garilli, A. Iovino, P. Kampczyk, J. -P. Kneib, C. Knobel, K. Kovac, F. Lamareille, J. -F. Le Borgne, V. Le Brun, C. Maier, R. Pello, Y. Peng, E. Perez Montero, E. Ricciardelli, C. Scarlata, J. D. Silverman, M. Tanaka, L. Tasca, L. Tresse, E. Zucca, U. Abbas, D. Bottini, P. Capak, A. Cappi, P. Cassata, M. Fumana, L. Guzzo, A. Leauthaud, D. Maccagni, C. Marinoni, H. J. McCracken, P. Memeo, B. Meneux, P. Oesch, C. Porciani, R. Scaramella, N. Scoville

备注：: 11 pages, Accepted for publication in A&A
DOI：: 10.1051/0004-6361:200810520

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摘要：

目标。我们调查三个主要的光学星系观测（光谱特性，颜色和形态）之间的关系，利用COSMOS/zCOSMOS调查提供的数据集。本文的目的是定义一个简单的星系分类立方体，使用精心挑选的样本约1000个星系。方法.使用中分辨率光谱的第一个1 k zCOSMOS明亮的样品，光学光度学的斯巴鲁/COSMOS观测，和来自ACS成像的形态测量，我们分析了星系人口的属性到z~1。应用三个简单的分类方案（光谱，光度和形态），我们确定了两个主要的星系类型，这似乎是联系在一起的双峰星系人口。这三个参数分类构成了“分类立方体”的轴。结果一个非常好的协议之间存在的分类光谱数据（静止/恒星形成星系）和基于颜色（红/蓝星系）。第三个参数（形态）是不太好的相关性与前两个：事实上，一个很好的相关性之间的光谱分类和基于形态分析（早期/晚期型星系）的实现后，部分补充的形态分类与额外的颜色信息。最后，分析样本中所有星系的3D分布，我们发现大约85%的星系显示出完全一致的分类，要么是静止的，红色的，以膨胀为主的星系（~20%），要么是恒星形成的，蓝色的，以盘为主的星系（~65%）。这些结果意味着星系双峰性在形态、颜色和占优势的恒星星族方面都是一致的，至少在z~1范围内是这样。

英文摘要：

Aims. We investigate the relationships between three main optical galaxy observables (spectral properties, colours, and morphology), exploiting the data set provided by the COSMOS/zCOSMOS survey. The purpose of this paper is to define a simple galaxy classification cube, using a carefully selected sample of around 1000 galaxies. Methods. Using medium resolution spectra of the first 1k zCOSMOS-bright sample, optical photometry from the Subaru/COSMOS observations, and morphological measurements derived from ACS imaging, we analyze the properties of the galaxy population out to z~1. Applying three straightforward classification schemes (spectral, photometric, and morphological), we identify two main galaxy types, which appear to be linked to the bimodality of galaxy population. The three parametric classifications constitute the axes of a "classification cube". Results. A very good agreement exists between the classification from spectral data (quiescent/star-forming galaxies) and that based on colours (red/blue galaxies). The third parameter (morphology) is less well correlated with the first two: in fact a good correlation between the spectral classification and that based on morphological analysis (early-/late-type galaxies) is achieved only after partially complementing the morphological classification with additional colour information. Finally, analyzing the 3D-distribution of all galaxies in the sample, we find that about 85% of the galaxies show a fully concordant classification, being either quiescent, red, bulge-dominated galaxies (~20%) or star-forming, blue, disk-dominated galaxies (~65%). These results imply that the galaxy bimodality is a consistent behaviour both in morphology, colour and dominant stellar population, at least out to z~1.

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