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New results on the ages of star clusters in region B of M82

机译：M82 B区星团年龄的新结果

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The post-starburst region B in M82 and its massive star cluster component have been the focus of multiple studies, with reports that there is a large population of coeval clusters of age ∼1 Gyr, which were created with a Gaussian initial mass distribution. This is in disagreement with other studies of young star clusters, which invariably find a featureless power-law mass distribution. Here, we present Gemini-North optical spectra of seven star clusters in M82-B and show that their ages are all between 10 and 300 Myr (a factor of 3–100 younger than previous photometric results) and that their extinctions range between near zero and 4 mag (A V ). Using new HST ACS-HRC U-band observations we age date an additional ∼30 clusters whose ages/extinctions agree well with those determined from spectroscopy. Completeness tests show that the reported ‘turn-over’ in the luminosity/mass distributions is most likely an artefact, due to the resolved nature of the clusters. We also show that the radial velocities of the clusters are inconsistent with them belonging to a bound region.
机译：M82的星爆后区域B及其巨大的星团组成一直是多项研究的重点，据报道，年龄在1 Gyr左右的同辈星团的数量很多，这些星团是由高斯初始质量分布创建的。这与年轻恒星团的其他研究不一致，后者总是发现无特征的幂律质量分布。在这里，我们展示了M82-B中七个星团的双子星座-北光谱，并显示它们的年龄都在10到300 Myr之间（比以前的光度学结果年轻3-100倍），并且它们的消光范围在零附近和4 mag（A V ）。使用新的HST ACS-HRC U波段观测数据，我们可以对另外约30个星团进行年龄测量，这些星团的年龄/消光度与光谱法确定的年龄/消光度非常吻合。完整性测试表明，由于星团的解析性质，所报告的光度/质量分布中的“周转”很可能是伪影。我们还表明，团簇的径向速度与它们属于约束区域的不一致。

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