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Detecting metal-rich intermediate-age globular clusters in NGC4570 using K-band photometry

机译:使用K波段光度法检测NGC4570中富金属的中年球状星团

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Globular cluster systems (GCSs) of most early-type galaxies feature two peaks in their optical colour distributions. Blue-peak globular clusters (GCs) are believed to be old and metal-poor, whereas the ages, metallicities, and the origin of the red-peak GCs are still being debated. We obtained deep K-band photometry and combined it with Hubble Space Telescope observations in g and z to yield a full spectral energy distribution from the optical to the near-infrared. This now allows us to break the age–metallicity degeneracy. We used our evolutionary synthesis models galev for star clusters to compute a large grid of models with different metallicities and a wide range of ages. Comparing these models to our observations revealed a large population of intermediate-age (1–3 Gyr) and metal-rich (≈solar-metallicity) GCs, that will give us further insights into the formation history of this galaxy.
机译:大多数早期类型星系的球状星团系统(GCS)在其光学颜色分布中都有两个峰值。蓝峰球状星团(GC)被认为是旧的并且金属贫乏,而红峰GC的年龄,金属性和起源仍在争论中。我们获得了深K波段测光法,并将其与哈勃太空望远镜在g和z中的观测值相结合,以产生从光学到近红外的完整光谱能量分布。现在,这使我们能够打破年龄-金属性的退化。我们将演化综合模型galev用于星团,以计算具有不同金属性和不同年龄范围的大型模型网格。将这些模型与我们的观测结果进行比较,可以发现大量的中年(1-3 Gyr)和富金属(≈太阳能金属)GC,这将使我们对这个星系的形成历史有更深入的了解。

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