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arXiv 1107.1966astro-ph.CO
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从SDSS选出的一个新的极环星系表

A new catalogue of polar-ring galaxies selected from the SDSS

Alexei Moiseev, Ksenia Smirnova, Aleksandrina Smirnova, Vladimir Reshetnikov

摘要:

极环星系(PRG)是一类独特的河外天体,可以研究与星系形成和演化有关的广泛问题,并研究其暗晕的性质。PRG的研究进展受到少数已知的这种类型的对象的限制。到目前为止,我们只能将大约20个运动学证实的星系归属于这一类别,大多数来自Whitmore等人(1990)的星表。我们提出了一个新的PRG目录的基础上,原来的银河动物园项目的结果。基于星系动物园的初步分类,我们查看了斯隆数字巡天(SDSS)的40000多张图像,并选择了275个星系,包括在我们的目录中。我们的斯隆的极环目录(SPRC)包含70个星系,我们被归类为“最佳候选人”,其中我们预计有一个非常高的比例真正的PRG,和115个良好的PRG候选人。53个星系被归类为PRG相关天体。我们确定了37个星系,它们的假定极环几乎可以正面看到。SPRC天体平均比Whitmore等人的目录中的星系更暗,位置更远。尽管我们的目录中确实包括了几十个新的邻近候选PRG。新的目录显着增加了真正的PRG候选者的数量,并可能作为一个良好的基础,为进一步详细研究个别星系,并作为一个单独的对象类PRG的统计分析。我们进行了光谱观测的六个星系从SPRC在6米望远镜。在五个星系中证实了极环的存在,其中一个物体似乎是一对星系的投影。加上文献数据,我们已经可以从我们的目录中分类10个星系的运动学证实的PRG。

英文摘要:

(Abridged) Galaxies with polar rings (PRGs) are a unique class of extragalactic objects allowing to investigate a wide range of problems, linked with the formation and evolution of galaxies, and to study the properties of their dark haloes. The progress in the study of PRGs is constrained by a small number of known objects of this type. Up to date, we can only attribute about two dozens of kinematically-confirmed galaxies to this class, mostly from Whitmore et al. (1990) catalogue. We present a new catalogue of PRGs based on the results of the original Galaxy Zoo project. Based on the preliminary classification of the Galaxy Zoo, we viewed more than 40000 images of the Sloan Digital Sky Survey (SDSS) and selected 275 galaxies, included in our catalogue. Our Sloan-based Polar Ring Catalog (SPRC) contains 70 galaxies that we classified as "the best candidates", among which we expect to have a very high proportion of true PRGs, and 115 good PRG candidates. 53 galaxies are classified as PRG related objects.We identified 37 galaxies that have their presumed polar rings seen almost face-on. The SPRC objects are on the average fainter and located further away than the galaxies from the catalog by Whitmore et al., although our catalogue does include dozens of new nearby candidate PRGs. The new catalogue significantly increases the number of genuine PRG candidates, and may serve as a good basis both for the further detailed study of individual galaxies, and for the statistical analysis of PRGs as a separate class of objects. We performed spectroscopic observations of six galaxies from the SPRC at the 6-m telescope. The existence of polar rings was confirmed in five galaxies, and one object appeared to be a projection of a pair of galaxies. Adding the literature data, we can already classify 10 galaxies from our catalogue to the kinematically-confirmed PRGs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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