碰撞环星系NGC 922中的年轻恒星星族
Young Stellar Populations in the Collisional Ring Galaxy NGC 922
摘要：
利用HST/WFPC 2光度学和星族合成模型研究了碰撞环星系NGC 922中的星团星族特性。我们发现，69%的检测到的集群是年轻的700万年前，他们中的大多数位于环或沿酒吧，与强大的H α发射一致。图像还显示了指向同伴的潮汐羽流。它的恒星年龄与先前存在的恒星一致，这些恒星可能在伴星通过时被剥离。我们比较了在NGC 922中观察到的恒星形成复合体与来自GOODS场的遥远环星系的恒星形成复合体。它们的质量和大小非常相似，说明它们的起源相似。最后，我们发现了模糊聚类的优秀候选祖先。
英文摘要：
We studied the star cluster population properties in the nearby collisional ring galaxy NGC 922 using HST/WFPC2 photometry and population synthesis modeling. We found that 69% of the detected clusters are younger than 7 Myr, and that most of them are located in the ring or along the bar, consistent with the strong Halpha emission. The images also show a tidal plume pointing toward the companion. Its stellar age is consistent with pre-existing stars that were probably stripped off during the passage of the companion. We compared the star-forming complexes observed in NGC 922 with those of a distant ring galaxy from the GOODS field. It indicates very similar masses and sizes, suggesting similar origins. Finally, we found clusters that are excellent progenitor candidates for faint fuzzy clusters.
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