论文标题
搜索使用苜蓿选择的矮人星系来搜索极端金属差的星系
Searches for Extremely Metal Poor Galaxies using ALFALFA-selected Dwarf Galaxies
论文作者
论文摘要
我们提出了一项研究，对苜蓿盲hi调查中选择的附近矮星系。该项目的主要目的是利用一种非标准选择方法，希望检测先前未识别的极贫困（XMP）星系。这项研究是由于最近发现了两个XMP星系$ - $ LEO P和LEONCINO $ - $ - 它们最初是通过Alfalfa调查找到的。我们已经为42个矮人系统获得了窄带H $α$图像，其中许多位于双鱼座超级群的局部空隙中。 11个最佳候选者的光谱导致确定了十个系统的金属丰度。尽管发现一个系统（AGC 123350）的氧气丰度（O/H）+12 = 7.46或$ \ sim $ 6 \％\％太阳能。我们样品中的一个星系的亮度表现出很高的氧气丰度，这表明它可能具有潮汐起源。
We present a study of nearby dwarf galaxies selected from the ALFALFA blind HI survey. A primary goal of the project was to utilize a non-standard selection method with the hope of detecting previously unrecognized extremely metal-poor (XMP) galaxies. The study was motivated by the recent discovery of two XMP galaxies $-$ Leo P and Leoncino $-$ which were both originally found via the ALFALFA survey. We have obtained narrowband H$α$ images for 42 dwarf systems, many of which are located in the local void in front of the Pisces-Perseus Supercluster. Spectra for eleven of the best candidates resulted in the determination of metal abundances for ten of the systems. None were found to be extremely metal poor, although one system (AGC 123350) was found to have an oxygen abundance of log(O/H)+12 = 7.46, or $\sim$6\% solar. One of the galaxies in our sample exhibits a high oxygen abundance for its luminosity, suggesting the possibility that it may have a tidal origin.
