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arXiv 1407.0307astro-ph.GA
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研究邻近星系群中的矮星系:光谱和光度数据

Studying the dwarf galaxies in nearby groups of galaxies: spectroscopic and photometric data

U. Hopp, J. Vennik

摘要:

星系演化的相互作用驱动的转变可能是非常有效的星系群。矮星系与他们的浅的潜力,预计将反映相互作用最突出的可观察到的结构。这一系列论文的主要目的是建立一个数据库,以便研究集团相互作用对矮星系形态和恒星形成性质的影响。首先,我们提出了我们的选择规则的目标群体和目标矮生候选成员的形态选择方法。其次,介绍了HET的光谱后续观测。第三,我们应用自己的减少方法的基础上自适应滤波,以获得表面光度的候选人。光谱跟踪表明,矮星的识别成功率约为55%,而群成员的识别成功率约为33%。共提出了17个新的低表面亮度成员。对于所有的候选人,总的幅度,颜色和光分布参数的缩放关系的上下文中导出和讨论。指出了SDSS标准管线在这类暗天体表面光度测量中的不足。我们的结论是,我们的选择策略是相当有效的,以获得一个样本的暗淡,低表面亮度的成员组内的室女座超星系团。在这些X射线暗淡的光度标度关系,而孤立的群体并没有显着不同的星系内的本地体积。

英文摘要:

Galaxy evolution by interaction driven transformation is probably highly efficient in groups of galaxies. Dwarf galaxies with their shallow potential are expected to reflect the interaction most prominently in their observable structure. The major aim of this series of papers is to establish a data base which allows to study the impact of group interaction onto the morphology and star-forming properties of dwarf galaxies. Firstly, we present our selection rules for target groups and the morphological selection method of target dwarf member candidates. Secondly, the spectroscopic follow-up observations with the HET are present. Thirdly, we applied own reduction methods based on adaptive filtering to derive surface photometry of the candidates. The spectroscopic follow-up indicate a dwarf identification success rate of roughly 55%, and a group member success rate of about 33%. A total of 17 new low surface brightness members is presented. For all candidates, total magnitudes, colours, and light distribution parameters are derived and discussed in the context of scaling relations. We point out short comings of the SDSS standard pipeline for surface photometry for these dim objects. We conclude that our selection strategy is rather efficient to obtain a sample of dim, low surface brightness members of groups of galaxies within the Virgo super-cluster. The photometric scaling relation in these X-ray dim, rather isolated groups does not significantly differ from those of the galaxies within the Local Volume.

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