Stellar Populations and Dust Extinction in Disk Galaxies

这项提议的主要目的是研究大量附近盘状星系的恒星年龄和金属丰度梯度以及尘埃灭绝。样本星系的选择将涵盖广泛的参数，如核活动（非活动星系与活动星系），表面亮度（普通螺旋星系与LSB螺旋星系）和环境（星团与场）。我们要求用红外望远镜观测的近红外数据样本将与SALT/SALTICAM的深光学数据相补充。这些数据将使用辐射传输模型进行分析，包括对盘状星系中尘埃和恒星的三维分布的现实参数化，以及改进的进化综合模型。

The main aim of this proposal is to study stellar age and metallicity gradients and dust extinction for a large number of nearby disk galaxies. The sample galaxies will be selected to cover a wide range of parameters, such as nuclear activity (non-active galaxies versus active galaxies), surface brightness (normal spiral galaxies versus LSB spiral galaxies) and environment (cluster versus field). The sample of near infrared data which we request to observe with the IRSF will be complemented with deep optical data with the SALT/SALTICAM. These data will be analyzed using radiation transfer models, including a realistic parametrization of the 3D distribution of dust and stars in disk galaxies, and refined evolutionary synthesis models.