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HUBBLE SPACE TELESCOPE PHOTOMETRY OF GLOBULAR CLUSTERS IN M81*

机译:M81中球状团簇的空间望远镜测光法*

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We perform aperture photometry and profile fitting on 419 globular cluster (GC) candidates with mV ≤ 23?mag identified in Hubble Space Telescope/Advanced Camera for Surveys BVI imaging, and estimate the effective radii of the clusters. We identify 85 previously known spectroscopically confirmed clusters, and newly identify 136 objects as good cluster candidates within the 3σ color and size ranges defined by the spectroscopically confirmed clusters, yielding a total of 221 probable GCs. The luminosity function peak for the 221 probable GCs with estimated total dereddening applied is V ~ (20.26 ± 0.13)?mag, corresponding to a distance of ~3.7 ± 0.3?Mpc. The blue and red GC candidates, and the metal-rich and metal-poor spectroscopically confirmed clusters, respectively, are similar in half-light radius. Red confirmed clusters are about 6% larger in median half-light radius than blue confirmed clusters, and red and blue good GC candidates are nearly identical in half-light radius. The total population of confirmed and "good" candidates shows an increase in half-light radius as a function of galactocentric distance.
机译:我们对419个球状星团(GC)候选物进行孔径光度测定和轮廓拟合,该候选物在哈勃太空望远镜/用于测量BVI的先进相机中确定为mV≤23?mag,并估计了星团的有效半径。我们确定了85个先前已知的经光谱确认的簇,并在由光谱确认的簇定义的3σ颜色和大小范围内,新确定了136个对象为良好的候选簇,总共产生了221个可能的GC。 221个可能的GC的光度函数峰值在施加了估计的总脱氮量后为V〜(20.26±0.13)?mag,对应于〜3.7±0.3?Mpc的距离。蓝色和红色GC候选物,以及在光谱上确认的富金属和贫金属的簇分别在半光半径下相似。红色证实的簇的中值半光半径比蓝色证实的簇大约6%,红色和蓝色的良好GC候选物的半光半径几乎相同。已确认和“良好”候选人的总人数显示半光半径随半视距的增加而增加。

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