The properties of a large volume-limited sample of face-on low surface brightness disk galaxies  

作　　者：Guo-Hu Zhong Yan-Chun Liang Feng-Shan Liu Francois Hammer Karen Disseau Li-Cai Deng 

机构地区：[1]National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China [2]Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academyof Sciences, Beijing 100012, China [3]Graduate University of Chinese Academy of Sciences, Beijing 100049, China [4]GEPI, Observatoire de Paris-Meudon, 92195 Meudonl France [5]College of Physical Science and Technology, Shenyang Normal University, Shenyang 110034,China [6]Univ Paris Diderot, Sorbonne Paris Cit6, GEPI, UMR8111 CNRS, Observatoire de Paris,F-92190 Meudon, France

出　　处：《Research in Astronomy and Astrophysics》2012年第11期1486-1498,共13页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 10933001, 10973006, 10973015 and 10673002);the National Basic Research Program of China (973 Program; Nos. 2007CB815404 and 2007CB815406);the Young Researcher Grant of National Astronomical Observatories, Chinese Academy of Sciences

摘　　要：We select a large volume-limited sample of low surface brightness galax- ies （LSBGs, 2021） to investigate in detail their statistical properties and their dif- ferences from high surface brightness galaxies （HSBGs, 3639）. The distributions of stellar masses of LSBGs and HSBGs are nearly the same and they have the same me- dian values. Thus this volume-limited sample has good completeness and is further removed from the effect of stellar masses on their other properties when we compare LSBGs to HSBGs. We found that LSBGs tend to have lower stellar metallicities and lower effective dust attenuations, indicating that they have lower dust than HSBGs. The LSBGs have relatively higher stellar mass-to-light ratios, higher gas fractions, lower star forming rates （SFRs）, and lower specific SFRs than HSBGs. Moreover, with the decreasing surface brightness, gas fraction increases, but the SFRs and spe- cific SFRs decrease rapidly for the sample galaxies. This could mean that the star formation histories between LSBGs and HSBGs are different, and HSBGs may have stronger star forming activities than LSBGs.We select a large volume-limited sample of low surface brightness galax- ies （LSBGs, 2021） to investigate in detail their statistical properties and their dif- ferences from high surface brightness galaxies （HSBGs, 3639）. The distributions of stellar masses of LSBGs and HSBGs are nearly the same and they have the same me- dian values. Thus this volume-limited sample has good completeness and is further removed from the effect of stellar masses on their other properties when we compare LSBGs to HSBGs. We found that LSBGs tend to have lower stellar metallicities and lower effective dust attenuations, indicating that they have lower dust than HSBGs. The LSBGs have relatively higher stellar mass-to-light ratios, higher gas fractions, lower star forming rates （SFRs）, and lower specific SFRs than HSBGs. Moreover, with the decreasing surface brightness, gas fraction increases, but the SFRs and spe- cific SFRs decrease rapidly for the sample galaxies. This could mean that the star formation histories between LSBGs and HSBGs are different, and HSBGs may have stronger star forming activities than LSBGs.

关 键 词：GALAXIES fundamentalparameters--galaxies general--galaxies statis-tics -- galaxies stellar content 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TM923.4[自动化与计算机技术—计算机科学与技术]