棒型镓（SFB）中的恒星形成特性。I. NGC 7479的紫外-红外成像和光谱研究
Star Formation Properties in Barred Galaxies(SFB). I. Ultraviolet-to-Infrared Imaging and Spectroscopic Studies of NGC 7479
摘要：
大尺度条和微小的合并是星系长期演化的重要驱动力。利用银河系演化探测器的地面光学图像和光谱以及紫外数据和斯皮策空间望远镜的红外数据，对棒星系NGC 7479的恒星形成特性进行了多波长研究，该星系也具有明显的小合并特征。利用各种恒星形成示踪剂，我们发现在恒星棒和小合并的共同作用下，恒星形成活动主要发生在星系棒和臂上，而恒星形成速率从棒到盘是变化的。在光谱合成的帮助下，我们发现棒区在大约1亿年前发生了强烈的恒星形成，并且恒星棒的年龄可能是$\sim$ 10 Gyr。通过将我们的结果与Jogee等人的长期进化情景进行比较，我们认为，NGC 7479目前可能正处于长期演化的过渡阶段，它最终可能成为一个早型星系或亮红外星系。我们还注意到NGC 7479最近发生了可能的小合并事件，我们发现了两个小合并残留物的候选者。
英文摘要：
Large-scale bars and minor mergers are important drivers for the secular evolution of galaxies. Based on ground-based optical images and spectra as well as ultraviolet data from the Galaxy Evolution Explorer and infrared data from the Spitzer Space Telescope, we present a multi-wavelength study of star formation properties in the barred galaxy NGC 7479, which also has obvious features of a minor merger. Using various tracers of star formation, we find that under the effects of both a stellar bar and a minor merger, star formation activity mainly takes place along the galactic bar and arms, while the star formation rate changes from the bar to the disk. With the help of spectral synthesis, we find that strong star formation took place in the bar region about 100 Myr ago, and the stellar bar might have been $\sim$10 Gyr old. By comparing our results with the secular evolutionary scenario from Jogee et al., we suggest that NGC 7479 is possibly in a transitional stage of secular evolution at present, and it may eventually become an earlier type galaxy or a luminous infrared galaxy. We also note that the probable minor merger event happened recently in NGC 7479, and we find two candidates for minor merger remnants.
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