THE SNAPSHOT HUBBLE U-BAND CLUSTER SURVEY (SHUCS). I. SURVEY DESCRIPTION AND FIRST APPLICATION TO THE MIXED STAR CLUSTER POPULATION OF NGC 4041
THE SNAPSHOT HUBBLE U-BAND CLUSTER SURVEY (SHUCS). I. SURVEY DESCRIPTION AND FIRST APPLICATION TO THE MIXED STAR CLUSTER POPULATION OF NGC 4041
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DOI：
10.1088/0004-6256/145/5/137
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发表时间：
2013-02
期刊：
影响因子：
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通讯作者：
I. Konstantopoulos;L. Smith;A. Adamo;E. Silva-Villa;J. Gallagher;N. Bastian;J. Ryon;M. Westmoquette;E. Zackrisson;S. Larsen;D. Weisz;J. C. C. A. A. Observatory-J.-C.-C.-A.-A.-Observatory-2248073539;The Pennsylvania State University;Space Telescope Science Institute;E. S. Agency;M. F. Astronomy;Universit'e Laval;U. Wisconsin--Madison-U.-Wisconsin--Madison-1387898181;Excellence Cluster Universe;Liverpool John Moore's University;E. Observatory;S. University;R. Nijmegen;U. Washington
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作者：
I. Konstantopoulos;L. Smith;A. Adamo;E. Silva-Villa;J. Gallagher;N. Bastian;J. Ryon;M. Westmoquette;E. Zackrisson;S. Larsen;D. Weisz;J. C. C. A. A. Observatory-J.-C.-C.-A.-A.-Observatory-2248073539;The Pennsylvania State University;Space Telescope Science Institute;E. S. Agency;M. F. Astronomy;Universit'e Laval;U. Wisconsin--Madison-U.-Wisconsin--Madison-1387898181;Excellence Cluster Universe;Liverpool John Moore's University;E. Observatory;S. University;R. Nijmegen;U. Washington
我们提出了快照哈勃U波段星团巡天（SHUCS），一个项目，旨在通过新的F336 W（U波段等效）从宽视场相机3成像，并与哈勃太空望远镜的档案BVI等效数据表征附近的10个星系（d < 23 Mpc，一半在1012 Mpc内）的星星集群人口。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。该样本主要由低倾角的螺旋星系组成，处于不同程度的隔离状态（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星集群人口的NGC 4041，一个巨大的SAbc星系在距离为1.23兆秒差距，和一个小集团的六个巨大的成员的一部分的概念验证研究。我们解决了两个结构组件与不同的恒星种群，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。我们还注意到星系演化探测器紫外成像中星系外围的潮汐特征，并对其进行了全面的多波长研究NGC 4041及其母星系群。我们推断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径向减少星星形成率的模式。我们建议，结合研究的星星集群人口与宽带指标不仅是有利的，但往往很容易实现彻底的档案数据集。
We present the Snapshot Hubble U-band Cluster Survey (SHUCS), a project aimed at characterizing the star cluster populations of 10 nearby galaxies (d < 23 Mpc, half within ≈12 Mpc) through new F336W (U-band equivalent) imaging from Wide Field Camera 3, and archival BVI-equivalent data with the Hubble Space Telescope. Completing the UBVI baseline reduces the age–extinction degeneracy of optical colors, 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 active galactic nucleus 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 Galaxy Evolution Explorer 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 broadband metrics is not only advantageous, but often easily achievable thorough archival datasets.