James Webb Space Telescope NIRCam images have revealed 154 reliable globular cluster (GC) candidates around the z = 0.0513 elliptical galaxy VV 191a after subtracting 34 likely interlopers from background galaxies inside our search area. NIRCam broadband observations are made at 0.9–4.5 μm using the F090W, F150W, F356W, and F444W filters. Using point-spread-function-matched photometry, the data are analyzed to present color–magnitude diagrams and color distributions that suggest a relatively uniform population of GCs, except for small fractions of reddest (5%–8%) and bluest (2%–4%) outliers. GC models in the F090W versus (F090W–F150W) diagram fit the NIRCam data well and show that the majority of GCs detected have a mass of ∼10^6.5 M _⊙, with metallicities [Fe/H] spanning the typical range expected for GCs (−2.5 ≲ [Fe/H]≲ 0.5). However, the models predict ∼0.3–0.4 mag bluer (F356W–F444W) colors than the NIRCam data for a reasonable range of GC ages, metallicities, and reddening. Although our data do not quite reach the luminosity function turnover, the measured luminosity function is consistent with previous measurements, suggesting an estimated peak at m _AB ∼ −9.4 ± 0.2 mag in the F090W filter.

中文翻译：

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JWST NIRCam 光度测量：围绕明亮椭圆星系 VV 191a（z = 0.0513）的球状星团的研究

詹姆斯·韦伯太空望远镜 NIRCam 图像揭示了围绕 154 个可靠的球状星团 (GC) 候选者z= 0.0513 椭圆星系 VV 191a 从我们搜索区域内的背景星系中减去 34 个可能的闯入者。 NIRCam 宽带观测在 0.9–4.5 处进行μm 使用 F090W、F150W、F356W 和 F444W 滤镜。使用点扩散函数匹配光度测定法，对数据进行分析，以呈现颜色-幅度图和颜色分布，表明 GC 群体相对均匀，除了一小部分最红 (5%–8%) 和最蓝 (2%) –4%) 异常值。 F090W 与 (F090W–F150W) 图中的 GC 模型很好地拟合了 NIRCam 数据，并表明检测到的大多数 GC 的质量为 ∼10 ^6.5 中号 _⊙，金属丰度 [Fe/H] 跨越 GC 预期的典型范围 (−2.5 ≲ [Fe/H]≲ 0.5)。然而，在合理的 GC 年龄、金属丰度和红化范围内，模型预测的颜色比 NIRCam 数据蓝 ∼0.3–0.4 mag (F356W–F444W)。尽管我们的数据没有完全达到光度函数周转率，但测量的光度函数与之前的测量结果一致，表明估计峰值为米 F090W 滤波器中的_{AB ∼ −9.4 ± 0.2 mag。}