Environment, morphology and stellar populations of bulgeless low surface brightness galaxies
Environment, morphology and stellar populations of bulgeless low surface brightness galaxies
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DOI：
10.1051/0004-6361/201525796
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
X. Shao;K. Disseau;Y. Yang;F. Hammer;M. Puech;M. Rodrigues;Y. Liang;L. Deng
中科院分区：
文献类型：
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作者：
X. Shao;K. Disseau;Y. Yang;F. Hammer;M. Puech;M. Rodrigues;Y. Liang;L. Deng
基于斯隆数字巡天 DR 7，我们研究了红移范围为 0.024 至 0.04 且 $M_r$ $\leq$ $-18.8$ 的体积有限样本中无球核低表面亮度 (LSB) 星系的环境、形态和恒星种群。局部密度参数$\Sigma_5$用于追踪它们的环境。我们发现，对于无球核星系，表面亮度不依赖于环境。对不同环境中的无球核LSB星系和具有不同形态的无球核LSB星系的恒星群进行了比较。低密度区域LSB星系的恒星种群与高密度区域LSB星系的恒星种群相似。不规则的 LSB 星系比规则的 LSB 星系拥有更多的年轻恒星，并且金属含量也更贫乏。这些结果表明，LSB 星系的演化可能是由它们的动态（包括合并）驱动的，而不是由它们的大尺度环境驱动的。
Based on the Sloan Digital Sky Survey DR 7, we investigate the environment, morphology and stellar population of bulgeless low surface brightness (LSB) galaxies in a volume-limited sample with redshift ranging from 0.024 to 0.04 and $M_r$ $\leq$ $-18.8$. The local density parameter $\Sigma_5$ is used to trace their environments. We find that, for bulgeless galaxies, the surface brightness does not depend on the environment. The stellar populations are compared for bulgeless LSB galaxies in different environments and for bulgeless LSB galaxies with different morphologies. The stellar populations of LSB galaxies in low density regions are similar to those of LSB galaxies in high density regions. Irregular LSB galaxies have more young stars and are more metal-poor than regular LSB galaxies. These results suggest that the evolution of LSB galaxies may be driven by their dynamics including mergers rather than by their large scale environment.