标题： 银河系演化探测器发现的最紫外明亮星系的多样特性 显示英文标题

标题： The Diverse Properties of the Most Ultraviolet Luminous Galaxies Discovered by the Galaxy Evolution Explorer

摘要： 我们报告了通过将银河系演化探测器（GALEX）调查与斯隆数字天空调查第三数据发布相匹配所选择的一组紫外线明亮星系（UVLGs）的特性。在0.0<z<0.3范围内由GALEX检测到的25362个星系中，有215个星系在1530埃（观测波长）处的L>2x10^10 L_solar。这一群体的特性与紫外线表面亮度密切相关。我们发现，紫外线表面亮度较低的星系主要是包含老恒星和年轻恒星种群混合的大螺旋系统，而高表面亮度的星系主要由紧凑的星暴系统组成。在表面亮度与光度的关系、大小与光度的关系、质量-金属丰度关系和其他参数方面，紧凑的UVLGs明显偏离了整个星系样本所确立的趋势。具有最高表面亮度的紧凑UVLGs子集（“超紧凑UVLGs”）具有与更高红移的Lyman Break Galaxies显著相似的特征。它们比典型的本地紫外线明亮星暴星系和蓝致密矮星系要明亮得多。它们的金属丰度系统性地低于相同恒星质量的正常星系，表明它们化学演化程度较低。在所有这些方面，它们是Lyman Break Galaxies的最佳本地类比。 显示英文摘要

摘要： We report on the properties of a sample of ultraviolet luminous galaxies (UVLGs) selected by matching the Galaxy Evolution Explorer (GALEX) Surveys with the Sloan Digital Sky Survey Third Data Release. Out of 25362 galaxies between 0.0<z<0.3 detected by GALEX, there are 215 galaxies with L>2x10^10 L_solar at 1530 Angstroms (observed wavelength). The properties of this population are well correlated with ultraviolet surface brightness. We find that the galaxies with low UV surface brightness are primarily large spiral systems with a mixture of old and young stellar populations, while the high surface brightness galaxies consist primarily of compact starburst systems. In terms of the behavior of surface brightness with luminosity, size with luminosity, the mass-metallicity relation, and other parameters, the compact UVLGs clearly depart from the trends established by the full sample of galaxies. The subset of compact UVLGs with the highest surface brightness (``supercompact UVLGs'') have characteristics that are remarkably similar to Lyman Break Galaxies at higher redshift. They are much more luminous than typical local ultraviolet-bright starburst galaxies and blue compact dwarf galaxies. They have metallicities that are systematically lower than normal galaxies of the same stellar mass, indicating that they are less chemically evolved. In all these respects, they are the best local analogs for Lyman Break Galaxies.