arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1409.3283astro-ph.GA
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扩展的室女星系团星表

The Extended Virgo Cluster Catalog

Suk Kim, Soo-Chang Rey, Helmut Jerjen, Thorsten Lisker, Eon-Chang Sung, Youngdae Lee, Jiwon Chung, Mina Pak, Wonhyeong Yi, Woong Lee

摘要:

我们提出了一个新的星系目录中更广泛的区域的室女星系团,根据斯隆数字巡天(SDSS)数据发布7。扩展的室女星系团星表(EVCC)的面积为725 deg^2或60.1 Mpc^2。它比经典的室女星系团星表(VCC)的足迹大5.2倍,达到了室女星系团维里半径的3.5倍。我们选择了1324个径向速度小于3000 km ^-1的光谱目标星系。此外,265个在SDSS光谱巡天中遗漏但在NASA河外星系数据库中有可用红移的星系也包括在内。我们的选择过程总共获得了1589个星系,其中676个星系不包括在VCC中。通过与星系团坍落模型的红移比较,确定了确定的和可能的星系团成员。我们采用了两个独立的和互补的星系分类方案:传统的形态分类的基础上的视觉检查的光学图像和星系的光谱特征的表征。SDSS u,g,r,i和z通带测光的所有EVCC星系进行使用源提取器。我们比较了EVCC星系与VCC星系的形态,空间分布和光度函数。EVCC定义了一个全面的星系样本,涵盖了更广泛的星系密度范围,与室女星系团的内部区域有很大的不同。它将成为今后在扩大的室女星系团区域进行星系演化研究的基础,补充正在进行和计划进行的各种波长的室女星系团调查。

英文摘要:

We present a new catalog of galaxies in the wider region of the Virgo cluster, based on the Sloan Digital Sky Survey (SDSS) Data Release 7. The Extended Virgo Cluster Catalog (EVCC) covers an area of 725 deg^2 or 60.1 Mpc^2. It is 5.2 times larger than the footprint of the classical Virgo Cluster Catalog (VCC) and reaches out to 3.5 times the virial radius of the Virgo cluster. We selected 1324 spectroscopically targeted galaxies with radial velocities less than 3000 kms^-1. In addition, 265 galaxies that have been missed in the SDSS spectroscopic survey but have available redshifts in the NASA Extragalactic Database are also included. Our selection process secured a total of 1589 galaxies of which 676 galaxies are not included in the VCC. The certain and possible cluster members are defined by means of redshift comparison with a cluster infall model. We employed two independent and complementary galaxy classification schemes: the traditional morphological classification based on the visual inspection of optical images and a characterization of galaxies from their spectroscopic features. SDSS u, g, r, i, and z passband photometry of all EVCC galaxies was performed using Source Extractor. We compare the EVCC galaxies with the VCC in terms of morphology, spatial distribution, and luminosity function. The EVCC defines a comprehensive galaxy sample covering a wider range in galaxy density that is significantly different from the inner region of the Virgo cluster. It will be the foundation for forthcoming galaxy evolution studies in the extended Virgo cluster region, complementing ongoing and planned Virgo cluster surveys at various wavelengths.

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