泰山5号的真正本质：银河系中最有效的MSP“熔炉”
The true nature of Terzan 5: the most efficient "furnace" of MSPs in the Galaxy
摘要：
Terzan 5是一个类似于球状星团（GC）的恒星系统，拥有已知最大的MSP种群。在ESO-VLT上使用多共轭自适应光学演示器MAD，我们最近获得了极好的（K，J-K）色星等图，该图揭示了在星等和颜色上分离良好的两个水平分支（HB）的存在（Ferraro等人，2009，Nature，462，483）。NIRSPEC@Keck的快速光谱跟踪表明，这两个种群具有（1）显着不同的铁含量（微弱和明亮HB的[Fe/H]分别为-0.2和+0.3），（2）不同的[α/Fe]丰度模式和（3）没有证据表明GC中通常观察到的Al-O反相关性。所有这些性质都表明Ter 5远不是一个真正的球状星团。相反，它经历了大量超新星（SNe）的爆炸，因此它的金属含量很高，过去应该比现在大得多，从而将SN喷出物保留在其潜在的井中。许多II型超新星也应该产生了大量的中子星（NS），这最终可以解释它异常庞大的MSP人口。
英文摘要：
Terzan5 is the globular cluster (GC)-like stellar system harboring the largest known population of MSPs. Using the Multi-Conjugate Adaptive Optics demonstrator MAD at the ESO - VLT, we recently obtained a superb (K, J - K) color-magnitude diagram, which has revealed the existence of two horizontal branches (HBs) well separated in magnitude and colour (Ferraro et al. 2009, Nature,462, 483). A prompt spectroscopic follow-up with NIRSPEC@Keck has shown that the two populations have (1) significantly different iron content ([Fe/H]= -0.2 and +0.3 for the faint and the bright HB, respectively), (2) distinct [alpha/Fe] abundance patterns and (3) no evidence of the Al-O anti-correlation commonly observed in GCs. All these properties suggest that Ter 5 is far from being a genuine globular. Instead it has experienced the explosion of a huge number of supernovae (SNe), thus accounting for its high metal content and it should have been much more massive in the past than today, thus to retain the SN ejecta within its potential well. The many type II SNe should have also produced a large number of neutron stars (NSs), which could finally explain its exceptionally large population of MSPs.
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