Stellar Content of the Galactic Starburst Template NGC 3603 from Adaptive Optics Observations
Stellar Content of the Galactic Starburst Template NGC 3603 from Adaptive Optics Observations
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来自自适应光学观测的银河星暴模板 NGC 3603 的恒星含量
DOI：
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发表时间：
1998
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通讯作者：
R. Genzel
中科院分区：
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作者：
F. Eisenhauer;A. Quirrenbach;H. Zinnecker;R. Genzel
我们提出了近红外自适应光学成像的银河星爆模板NGC 3603和恒星中心HD 97950。有明确的证据表明，在1 μ m或更小的范围内存在恒星，初始质量函数没有明显的截断或翻转。应用中等质量恒星主序前演化的理论模型，对观测到的色-色图、色-星等图和光度函数进行了约束，得到了年龄分布和初始质量函数。在系统误差范围内，这个初始质量函数遵循萨耳彼得幂律，指数Γ ≤ -0.73，直到观测极限小于1 μ m。小于4光年的恒星看起来年龄小于106岁，与之前HD 97950的高质量恒星的年龄测定结果相反。
We present near-infrared adaptive optics imaging of the Galactic starburst template NGC 3603 and its stellar center HD 97950. There is clear evidence for the presence of stars down to 1 ℳ or less. No cutoff or turnover in the initial mass function is evident. Applying theoretical models of the pre-main-sequence evolution of intermediate-mass stars to the observed color-color diagram, the color-magnitude diagram, and the luminosity function, we constrain both the age distribution and the initial mass function. Within the systematic errors, this initial mass function follows a Salpeter power law with index Γ ≤ -0.73 down to the observational limit of less than 1 ℳ. The stars with less than 4 ℳ appear to be younger than 106 yr, in contrast to previous age determinations of the high-mass content of HD 97950.