We study the ages of a large sample ( 1,802 ) of nearly face-on disk low surface brightness galaxies ( LSBGs ) by using the evolutionary population synthesis ( EPS ) model PEGASE with exponential decreasing star formation rate to fit their multiwavelength spectral energy distributions ( SEDs ) from far-ultraviolet ( FUV ) to near-infrared ( NIR ) .
The derived ages of LSBGs are 1-5 Gyr for most of the sample no matter the constant or varying dust extinction is adopted , which are similar to most of the previous studies on smaller samples .
This means that these LSBGs formed their majority of stars quite recently .
However , a small part of the sample ( \sim 2-3 % ) have larger ages as 5-8 Gyr , meaning their major star forming process may occur earlier .
At the same time , a large sample ( 5,886 ) of high surface brightness galaxies ( HSBGs ) are selected and studied in the same method for comparisons .
The derived ages are 1-5 Gyr for most of the sample ( 97 % ) as well .
These may mean that probably these LSBGs have no much different star formation history from their HSBGs counterparts .
But we should notice that the HSBGs are about 0.2 Gyr younger generally , which could mean that the HSBGs may have more recent star forming activities than the LSBGs .