Starformation and stellar populations in nearby galaxies

在Calar Alto天文台进行的观测有以下目标：1)我们建议通过宽带滤光器的光度研究来推导低表面亮度星系（LSBs）样本的结构和恒星组成。这将使我们能够解决这类星系的起源和演化问题。2)光学成像和近红外成像将用于研究盘状星系中心区域的恒星群，以揭示棒状星系和凸起部分之间的相互作用。H_alpha窄带成像和射电连续体测量的比较将使我们能够在更大的尺度上研究盘状星系的恒星形成，并寻找磁场结构与实际恒星形成区域的相关性。研究盘状星系的最外层为我们提供了一个独特的实验室，可以在更安静的环境中表征恒星的形成。这将通过拍摄面朝星系截断区域的非常深的宽带图像来完成，迄今为止只在边朝几何中观察到。

Observations to be conducted at Calar Alto Observatory have the following goals:1) We propose to derive the structure and stellar composition for a sample of low surface brightness galaxies (LSBs) by means of a photometric study in broadband filters. This will enable us to address the problem of the origin and evolution for this class of galaxies.2) Imaging at optical and NIR wavelengths will be used to study the stellar population of the central regions in disk galaxies in order to reveal the interplay between a bar and the bulge component. 3) The comparison of H_alpha narrowband imaging and radio-continuum measurements will allow us to examine the star-formation on larger scales in disk galaxies and to search for a correlation of magnetic field structures with actual regions of star formation.4) Studying the very outer parts of disk galaxies provide us a unique laboratory to characterise star formation in a more quiescent environment. This will be done by taking very deep broadband images of the truncation region of face-on galaxies hitherto only observed in the edge-on geometry.