A large sample of low surface brightness disc galaxies from the SDSS – I. The sample and the stellar populations
A large sample of low surface brightness disc galaxies from the SDSS – I. The sample and the stellar populations
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DOI：
10.1111/j.1365-2966.2008.13972.x
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发表时间：
2008-09
影响因子：
4.8
通讯作者：
G. Zhong;Y. Liang;F. Liu;F. Hammer;J. Hu;X. Y. Chen;L. Deng;B. Zhang
中科院分区：
文献类型：
--
作者：
G. Zhong;Y. Liang;F. Liu;F. Hammer;J. Hu;X. Y. Chen;L. Deng;B. Zhang
我们提出了一个大样本（12 282）的近面对低表面亮度（LSB）盘星系的SDSS-DR 4的主要星系样本中选择的属性。这些性质包括B波段中心表面亮度μ 0（B）、标度、积分星等、颜色和距离D。该样品的μ 0（B）值为22 ~ 24.5 mag arcsec-2，中值为22.42 mag arcsec-2，星盘尺度为2 ~ 19 kpc。它们非常明亮，M B的值为-18 ~-23等，中值为-20.08等。log h与M B、log h与log D、log D与M B之间存在明显的相关性。然而，μ 0（B）与log h、颜色等没有明显的相关性，颜色与log h的相关性虽然存在，但很弱。光学-光学和光学-近红外颜色-颜色图都表明，它们中的大多数都有年轻和年老的恒星种群。它们也满足颜色-星等关系，这表明较亮的星系通常倾向于更红。通过与具有较高表面亮度（HSB）（μ 0（B）为18.5 ~ 22 mag arcsec-2）的近面盘星系对照样本的比较，发现在给定的光度或距离下，观测到的LSB星系往往具有较大的标度。根据表面亮度将低、高强度超导体分为两个亚组，可以逐渐看出这些趋势。提取了一个体积有限的子样本来检查表面亮度的不完整性。唯一具有明显变化的性质关系是log h与μ 0（B）的关系，其在该子样本中显示相关性。
We present the properties of a large sample (12 282) of nearly face-on low surface brightness (LSB) disc galaxies selected from the main galaxy sample of SDSS-DR4. These properties include B-band central surface brightness μ 0 (B), scalelengths h, integrated magnitudes, colours and distances D. This sample has μ 0 (B) values from 22 to 24.5 mag arcsec -2 with a median value of 22.42 mag arcsec -2 , and disc scalelengths ranging from 2 to 19 kpc. They are quite bright with M B taking values from -18 to -23 mag with a median value of -20.08 mag. There exist clear correlations between log h and M B , log h and log D, log D and M B . However, no obvious correlations are found between μ 0 (B) and log h, colours, etc. The correlation between colours and log h is weak even though it exists. Both the optical-optical and optical-NIR colour-colour diagrams indicate that most of them have a mixture of young and old stellar populations. They also satisfy colour-magnitude relations, which indicate that brighter galaxies tend generally to be redder. The comparison between the LSBGs and a control sample of nearly face-on disc galaxies with higher surface brightness (HSB) with μ 0 (B) from 18.5 to 22 mag arcsec -2 show that, at a given luminosity or distance, the observed LSB galaxies tend to have larger scalelengths. These trends could be seen gradually by dividing both the LSBGs and HSBGs into two subgroups according to surface brightness. A volume-limited subsample was extracted to check the incompleteness of surface brightness. The only one of the property relations having an obvious change is the relation of log h versus μ 0 (B), which shows a correlation in this subsample.