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arXiv 2304.05076astro-ph.GAastro-ph.SR
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56个银河系球状星团方向上的较差红化

Differential reddening in the direction of 56 Galactic globular clusters

M. V. Legnardi, A. P. Milone, G. Cordoni, E. P. Lagioia, E. Dondoglio, A. F. Marino, S. Jang, A. Mohandasan, T. Ziliotto

备注：
14 pages, 14 figures, accepted for pubblication in MNRAS. The photometric catalogs corrected for differential reddening are publicly available at this website: http://progetti.dfa.unipd.it/GALFOR/
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AI总结：

本文利用哈勃空间望远镜紫外遗产巡天数据估计56个银河系球状星团方向的较差红化，发现21个星团改正效果显著，并测得$R_{V}$在约2.0至4.0间变化，揭示较差红化与银纬反相关、与平均红化正相关。

摘要：

银河系球状星团方向上存在的较差红化已被证明是传统颜色-星等图分析中的一个严重限制。本文中，我们估计了56个银河系球状星团方向上的局部红化变化。为此，我们使用了哈勃空间望远镜银河系球状星团紫外遗产巡天所发布的公开星表，这些星表包含F275W、F336W、F438W、F606W和F814W滤光片的光度测量数据。我们对光度测量进行了较差红化改正，发现在56个球状星团中有21个采用的改正程序显著改善了颜色-星等图。此外，我们测量了这些星团方向上的红化定律，发现$R_{V}$在银河系内表现出高度的变化性，范围从约$\sim2.0$到约$\sim4.0$。更新后的$R_{V}$值已被用于改进局部红化变化的测定，并为样本中21个高度红化的目标推导出高分辨率红化图。为了比较不同星团的结果，我们计算了较差红化分布的68$^{\rm th}$百分位数$σ_{ΔA_{\rm F814W}}$。该量从0.003 mag到0.030 mag不等，并且与银河纬度的绝对值表现出显著的反相关，与每个星团方向上的平均红化表现出强相关。因此，位于银河平面附近的高度红化球状星团通常在其视场内表现出更高的较差红化变化。

英文摘要：

The presence of differential reddening in the direction of Galactic globular clusters (GCs) has proven to be a serious limitation in the traditional colour-magnitude diagram (CMD) analysis. Here, we estimate local reddening variations in the direction of 56 Galactic GCs. To do that, we use the public catalogs derived as part of the Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters, which include photometry in the F275W, F336W, F438W, F606W, and F814W filters. We correct photometry for differential reddening finding that for 21 out of 56 GCs the adopted correction procedure significantly improves the CMDs. Moreover, we measure the reddening law in the direction of these clusters finding that $R_{V}$ exhibits a high level of variability within the Galaxy, ranging from $\sim2.0$ to $\sim4.0$. The updated values of $R_{V}$ have been used to improve the determination of local reddening variations and derive high-resolution reddening maps in the direction of the 21 highly-reddened targets within our sample. To compare the results of the different clusters, we compute the 68$^{\rm th}$ percentile of the differential-reddening distribution, $σ_{ΔA_{\rm F814W}}$. This quantity ranges from 0.003 mag to 0.030 mag and exhibits a significant anti-correlation with the absolute module of the Galactic latitude and a strong correlation with the average reddening in the direction of each cluster. Therefore, highly-reddened GCs located in the proximity of the Galactic plane typically show higher differential-reddening variations across their field of view.

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