Ultraviolet properties of Galactic globular clusters with GALEX

Ultraviolet properties of Galactic globular clusters with GALEX
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使用 GALEX 分析银河系球状星团的紫外特性

DOI：
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发表时间：
2013
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通讯作者：
R. O’Connell
R. O’Connell
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作者：
E. Dalessandro;F. Ferraro;R. Schiavon;S. Sohn;B. Lanzoni;R. O’Connell

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利用银河系演化探测器（GALEX）观测了44个银河系球状星团（GGC）在FUV和NUV波段的紫外（UV）积分色。我们首次发现，GCs与人马座矮星系有（FUV-V）的颜色系统红比GCs具有相同的金属丰度。M31 GC显示出与GGC几乎相同的UV颜色，而M87则系统地更蓝。我们推测存在一个有趣的趋势，这表明GC的UV颜色可能与宿主星系的质量相关，在这个意义上，更大质量的星系拥有更蓝的星系团。
We present ultraviolet (UV) integrated colors of 44 Galactic globular clusters (GGCs) observed with the Galaxy Evolution Explorer (GALEX) in both FUV and NUV bands. We find for the first time that GCs associated with the Sagittarius dwarf galaxy have (FUV-V) colors systematically redder than GGCs with the same metallicity. M31 GCs show almost the same UV colors as GGCs, while M87 are systematically bluer. We speculate about the presence of an interesting trend, suggesting that the UV color of GCs may be correlated with the mass of the host galaxy, in the sense that more massive galaxies possess bluer clusters.