银河动物园中的极环星系
Polar Ring Galaxies in the Galaxy Zoo
摘要:
我们报告了斯隆数字巡天(SDSS)数据库中银河动物园项目确定的16个候选极环星系(PRG)的观测结果。SDSS Stripe 82数据库中有五个星系的深度图像,而为了达到类似的深度,我们用1.8米的梵蒂冈先进技术望远镜观察了其余的星系。我们得到了主成分和环成分的积分星等和u-r颜色,并给出了7个天体的连续减影Hα+[NII]图像。我们提出了一个基本的形态和环境分析的星系,并讨论了它们的属性与其他类型的早型星系的比较。后续的光度和分光观测将有助于确认这些系统的运动学性质,并对其恒星星族进行更详细的分析。
英文摘要:
We report observations of 16 candidate polar ring galaxies (PRGs) identified by the Galaxy Zoo project in the Sloan Digital Sky Survey (SDSS) database. Deep images of five galaxies are available in the SDSS Stripe82 database, while to reach similar depth we observed the remaining galaxies with the 1.8-m Vatican Advanced Technology Telescope. We derive integrated magnitudes and u-r colours for the host and ring components and show continuum-subtracted Hα+[NII] images for seven objects. We present a basic morphological and environmental analysis of the galaxies and discuss their properties in comparison with other types of early-type galaxies. Follow-up photometric and spectroscopic observations will allow a kinematic confirmation of the nature of these systems and a more detailed analysis of their stellar populations.
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