星系团内介质中的恒星形成和致密星系团演化阶段的其它诊断
Star formation in the intragroup medium and other diagnostics of the evolutionary stages of compact groups of galaxies
摘要：
内容：致密星系群是具有高密度星系的实体，并作为研究星系相互作用，星系间恒星形成和星系演化的实验室。目的：本研究的主要目标是在7个致密星系群（HCG 2，7，22，23，92，100和NGC 92）的群内介质中寻找年轻天体，并评估每个星系群的相互作用阶段。方法：我们使用Fabry-Perot速度场和旋转曲线，结合GALEX NUV和FUV图像以及光学R带和HI图。结果如下：（i）HCG 7和HCG 23处于相互作用的早期阶段，（ii）HCG 2和HCG 22轻度相互作用，（iii）HCG 92，HCG 100和NGC 92处于进化的晚期阶段。我们发现，所有三个进化的群体都包含了群体内的年轻蓝色物体的群体，与年龄<1亿年一致，其中一些年龄<1千万年。我们还报告了在NGC 92的尾部发现了一个潮汐矮星系候选者。这三个星系群，除了包含具有特殊速度场的星系外，还显示出扩展的HI尾。结论：我们的研究结果表明，一个组的演化的高级阶段，加上组内HI云的存在下，可能会导致恒星形成的组内介质。附录中列出了迄今为止确认的所有星系际HII区和潮汐矮星系。
英文摘要：
Context: Compact groups of galaxies are entities that have high densities of galaxies and serve as laboratories to study galaxy interactions, intergalactic star formation and galaxy evolution. Aims: The main goal of this study is to search for young objects in the intragroup medium of seven compact groups of galaxies: HCG 2, 7, 22, 23, 92, 100 and NGC 92 as well as to evaluate the stage of interaction of each group. Methods: We used Fabry-Perot velocity fields and rotation curves together with GALEX NUV and FUV images and optical R-band and HI maps. Results: (i) HCG 7 and HCG 23 are in early stages of interaction, (ii) HCG 2 and HCG 22 are mildly interacting, and (iii) HCG 92, HCG 100 and NGC 92 are in late stages of evolution. We find that all three evolved groups contain populations of young blue objects in the intragroup medium, consistent with ages < 100 Myr, of which several are younger than < 10 Myr. We also report the discovery of a tidal dwarf galaxy candidate in the tail of NGC 92. These three groups, besides containing galaxies that have peculiar velocity fields, also show extended HI tails. Conclusions: Our results indicate that the advanced stage of evolution of a group, together with the presence of intragroup HI clouds, may lead to star formation in the intragroup medium. A table containing all intergalactic HII regions and tidal dwarf galaxies confirmed to date is appended.
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