哈勃U波段星团巡天快照（SHUCS）。I.巡天描述及其对NGC 4041混合星团星族的首次应用
The Snapshot Hubble U-Band Cluster Survey (SHUCS). I. Survey Description and First Application to the Mixed Star Cluster Population of NGC 4041
摘要：
我们介绍了快照哈勃U波段星团巡天（SHUCS），一个旨在通过WFC 3的新F336W（U波段等效）成像和HST的BVI等效数据来表征10个邻近星系（d<23 Mpc，一半在12 Mpc内）的星团种群的项目。完成UBVI基线降低了光学颜色的年龄消光退化，从而能够测量我们调查所涵盖的数千个星团的可靠年龄和质量。样本主要由低倾角的螺旋星系组成，处于不同程度的孤立状态（孤立、成组、合并），并包括两个活动星系核宿主。这第一篇论文概述了调查本身，观测数据集，分析方法，并提出了一个大规模的性质和星团人口的NGC 4041，一个巨大的SAbc星系的距离为23 Mpc的概念验证研究，和一个小集团的六个巨大的成员。我们解决了两个结构组件与不同的恒星星族，形态更类似于合并和相互作用的系统。我们还发现了强有力的证据截断，Schechter型质量函数，和类似的分段光度函数。这些结果表明，分仓必须删除大部分的子结构中存在的质量和光度的功能，并可能占这些功能在文献中的内在形状的相互矛盾的报告。我们还注意到在银河系的边缘在GALEX紫外成像潮汐功能，并跟进NGC 4041及其母集团的全面的多波长研究。我们推断出一个小的合并作为一个可能的原因，它的分段结构和观察到的模式径向下降的恒星形成率。我们建议，结合研究星团人口与宽带指标不仅是有利的，但往往很容易通过档案数据集实现。
英文摘要：
We present the Snapshot Hubble U-band Cluster Survey (SHUCS), a project aimed at characterizing the star cluster populations of ten nearby galaxies (d<23 Mpc, half within 12 Mpc) through new F336W (U band equivalent) imaging from WFC3, and archival BVI-equivalent data with HST. Completing the UBVI baseline reduces the age-extinction degeneracy of optical colours, thus enabling the measurement of reliable ages and masses for the thousands of clusters covered by our survey. The sample consists chiefly of face-on spiral galaxies at low inclination, in various degrees of isolation (isolated, in group, merging), and includes two AGN hosts. This first paper outlines the survey itself, the observational datasets, the analysis methods, and presents a proof-of-concept study of the large-scale properties and star cluster population of NGC 4041, a massive SAbc galaxy at a distance of 23 Mpc, and part of a small grouping of six giant members. We resolve two structural components with distinct stellar populations, a morphology more akin to merging and interacting systems. We also find strong evidence of a truncated, Schechter-type mass function, and a similarly segmented luminosity function. These results indicate that binning must erase much of the substructure present in the mass and luminosity functions, and might account for the conflicting reports on the intrinsic shape of these functions in the literature. We also note a tidal feature in the outskirts of the galaxy in GALEX UV imaging, and follow it up with a comprehensive multi-wavelength study of NGC 4041 and its parent group. We deduce a minor merger as a likely cause of its segmented structure and the observed pattern of a radially decreasing star formation rate. We propose that combining the study of star cluster populations with broad-band metrics is not only advantageous, but often easily achievable through archival datasets.
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