THE SNAPSHOT HUBBLE U-BAND CLUSTER SURVEY (SHUCS). II. THE STAR CLUSTER POPULATION OF NGC 2997
THE SNAPSHOT HUBBLE U-BAND CLUSTER SURVEY (SHUCS). II. THE STAR CLUSTER POPULATION OF NGC 2997
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哈勃 U 波段星团巡天快照 (SHUCS)。
DOI：
10.1088/0004-6256/148/2/33
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
E. Zackrisson
中科院分区：
文献类型：
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作者：
J. Ryon;A. Adamo;A. Adamo;N. Bastian;L. J. Smith;J. Gallagher;I. Konstantopoulos;S. Larsen;E. Silva;E. Zackrisson
我们研究NGC 2997的星星星团人口，NGC 2997是一个巨大的螺旋星系，位于9.5 Mpc，哈勃U波段星团巡天快照（SHUCS）的目标。结合我们的U波段成像从SHUCS档案BVI成像从哈勃太空望远镜，我们选择了一个高置信度的样本集群在环核环和磁盘通过自动检测程序和目视检查相结合。在所有四个滤波器中的星团光度函数都可以用指数为-1.7到-2.3的幂律近似。观察到一些偏离纯幂律形状，暗示在集群质量函数中存在高质量截断。然而，在检查星系团的质量函数时，我们发现它与指数为−2.2 ± 0.2的纯幂律一致，尽管在102.5 × 104 M处有轻微的弯曲。未观察到统计学显著截断。从星系团的年龄分布中，我们发现在盘和环核环中都有一个低的破裂率（ε =-0.1）。最后，我们估计了每个区域过去1亿年的星系团形成效率（Γ），发现圆盘为7% ± 2%，环核环为12% ± 4%，整个UBVI足迹为10% ± 3%。这项研究强调了需要宽场UBVI覆盖的星系，以详细研究集群人口，虽然一个小样本的集群可以提供显着的洞察人口的特点。
We study the star cluster population of NGC 2997, a giant spiral galaxy located at 9.5 Mpc and targeted by the Snapshot Hubble U-band Cluster Survey (SHUCS). Combining our U-band imaging from SHUCS with archival BVI imaging from the Hubble Space Telescope, we select a high confidence sample of clusters in the circumnuclear ring and disk through a combination of automatic detection procedures and visual inspection. The cluster luminosity functions in all four filters can be approximated by power laws with indices of −1.7 to −2.3. Some deviations from pure power-law shape are observed, hinting at the presence of a high-mass truncation in the cluster mass function. However, upon inspection of the cluster mass function, we find it is consistent with a pure power law of index −2.2 ± 0.2 despite a slight bend at ∼2.5 × 104 M☉. No statistically significant truncation is observed. From the cluster age distributions, we find a low rate of disruption (ζ ∼ −0.1) in both the disk and circumnuclear ring. Finally, we estimate the cluster formation efficiency (Γ) over the last 100 Myr in each region, finding 7% ± 2% for the disk, 12% ± 4% for the circumnuclear ring, and 10% ± 3% for the entire UBVI footprint. This study highlights the need for wide-field UBVI coverage of galaxies to study cluster populations in detail, though a small sample of clusters can provide significant insight into the characteristics of the population.
星团作为斯蒂芬五重奏中相互作用的示踪剂（希克森紧凑组 92）
DOI：
10.1088/0004-6256/142/2/42
发表时间：
2011
期刊：
The Astronomical Journal
影响因子：
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作者：
Fedotov K
通讯作者：
Fedotov K