阁楼上的幽灵：绘制S0星系NGC 5102的恒星内容
Ghosts in the Attic: Mapping the Stellar Content of the S0 Galaxy NGC 5102
摘要：
利用加拿大-法国-夏威夷望远镜的WIRCam和MegaCam获得的图像研究了邻近S 0星系NGC 5102中恒星的空间分布。除了探测器元件之间的间隙外，整个星系都是在r'和i'测量的，而J和Ks的数据则延伸到6 kpc（7个磁盘尺度长度）。星盘上有一小部分M_V < -3.5的7000万年前的主序星，其中大部分位于星系的南半部。C星与明亮的M巨星的比例与过去1 Gyr内恒星形成率的总体增加一致。在0.1 - 2 Gyr期间的恒星形成活动比过去的1亿年更加集中。盘的结构在5 kpc（5.5盘尺度长度）附近发生变化。RSG和明亮的AGB星沿着长轴的南部被追踪到14 kpc（15.6标度长度）的半径，而在东南短轴的16 kpc投影距离处也有明亮的AGB星。在星系中心的西边，有一大片AGB星，对着一个弧分。有人认为，这是一个伴星星系的残余物，引发了过去的恒星形成活动。
英文摘要：
The spatial distribution of stars in the nearby S0 galaxy NGC 5102 is investigated using images obtained with WIRCam and MegaCam on the Canada-France-Hawaii Telescope. With the exception of gaps between detector elements, the entire galaxy is surveyed in r' and i', while the J and Ks data extend out to 6 kpc (7 disk scale lengths). A modest population of main sequence (MS) stars with M_V < -3.5 and ages 70 Myr are detected throughout the disk, with the majority located in the southern half of the galaxy. The ratio of C stars to bright M giants is consistent with an overall increase in the star formation rate within the past 1 Gyr. Star-forming activity during the interval 0.1 - 2 Gyr was more centrally concentrated than during the past 100 Myr. The structure of the disk changes near 5 kpc (5.5 disk scale lengths). RSGs and bright AGB stars are traced out to a radius of 14 kpc (15.6 scale lengths) along the southern portion of the major axis, while a tentative detection is also made of bright AGB stars at a projected distance of 16 kpc along the south east minor axis. A large clump of AGB stars that subtends an arcmin is identified to the west of the galaxy center. It is argued that this is the remnant of a companion galaxy that triggered past episodes of elevated star-forming activity.
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