Global Properties of the Globular Cluster Systems of Four Spiral Galaxies
Global Properties of the Globular Cluster Systems of Four Spiral Galaxies
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四个螺旋星系球状星团系统的整体性质
DOI：
10.1086/521397
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
A. Larner
中科院分区：
文献类型：
--
作者：
K. Rhode;S. Zepf;A. Kundu;A. Larner
我们目前的结果从宽视场成像研究的球状星团（GC）系统的一个样本的边缘上，Sb-Sc螺旋星系距离约7-20百万秒差距。这项研究是一个更大的调查巨星系的GC人口的集合属性的一部分。我们在WIYN 3.5米望远镜上用大幅面CCD探测器在BVR滤波器中对星系进行成像，投影半径为20-40 kpc。对于四个星系（NGC 2683，NGC 3556，NGC 4157和NGC 7331），我们量化的GC系统的径向分布和估计的总数，光度和质量归一化的特定频率（SN和T），和蓝色（贫金属）的GC分数。第五个星系（NGC 3044）显然太遥远了，我们无法探测到它的GC系统。NGC 2683的SN比先前公布的值小2.5倍，部分原因可能是非GC污染减少。对于迄今为止的巡天所分析的旋涡星系，GC的平均数为170 ± 40，SN和T的加权平均值分别为0.8 ± 0.2和1.4 ± 0.3。我们使用的调查数据，得出的GC系统的径向范围和主机星系质量之间的关系超过20倍的质量。最后，我们确认的趋势，确定在以前的调查文件中，增加特定的频率的贫金属GC随着星系质量的增加。我们比较的数据与预测从一个简单的模型，并表明，仔细量化的星系中的贫金属GC的数量可以限制的GC和它们的宿主星系的形成红移。
We present results from a wide-field imaging study of the globular cluster (GC) systems of a sample of edge-on, Sb-Sc spiral galaxies ∼7-20 Mpc away. This study is part of a larger survey of the ensemble properties of the GC populations of giant galaxies. We imaged the galaxies in BVR filters with large-format CCD detectors on the WIYN 3.5 m telescope to projected radii of ∼20-40 kpc. For four galaxies (NGC 2683, NGC 3556, NGC 4157, and NGC 7331), we quantify the radial distributions of the GC systems and estimate the total number, luminosity- and mass-normalized specific frequencies (SN and T), and blue (metal-poor) fraction of GCs. A fifth galaxy (NGC 3044) was apparently too distant for us to have detected its GC system. Our SN for NGC 2683 is 2.5 times smaller than the previously published value, likely due in part to reduced contamination from non-GCs. For the spiral galaxies analyzed for the survey to date, the average number of GCs is 170 ± 40, and the weighted mean values of SN and T are 0.8 ± 0.2 and 1.4 ± 0.3, respectively. We use the survey data to derive a relationship between the radial extent of the GC system and host galaxy mass over a factor of 20 in mass. Finally, we confirm the trend, identified in previous survey papers, of increasing specific frequency of metal-poor GCs with increasing galaxy mass. We compare the data with predictions from a simple model and show that carefully quantifying the numbers of metal-poor GCs in galaxies can constrain the formation redshifts of the GCs and their host galaxies.
球状星团 - 星系指南
DOI：
10.1007/978-3-540-76961-3
发表时间：
2009
期刊：
影响因子：
--
作者：
Fiestas J;Spurzem R.
通讯作者：
Spurzem R.