IAU00793
Presentation type requested: EITHER
OPTICAL AND NEAR-INFRARED STUDIES OF NEARBY GALAXIES
Zhengyi Shao
Shanghai Astronomical Observatory

A sample of nearby galaxies, with both SDSS (EDR) and 2MASS (2nd release) photometric data available, has been established. Then the SED of these galaxies with 8 bands covers both optical and near-infrared regions. By using the Galaxy Isochrone Synthesis Spectral Evolution Library (GISSEL 01), the observational SEDs can be compared to the models to measure their age and metallicity of the domain luminous components for individual galaxies. It was found that, according to the current observational uncertainty, the age and metallicity of the nearby galaxy could be constrained in a quite small region. The relative error will be less than 10% for a galaxy with 8 Gy old and it’s metallicity to be 0.02 (solar). The distribution of ages and metallicities for different types of galaxies can be separated significantly. Furthermore, the stellar formation history and color gradient of very near galaxies are discussed.

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