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arXiv 0908.1331astro-ph.SR
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银河系中心脉冲星群中三颗脉冲星的发现

Discovery of Three Pulsars from a Galactic Center Pulsar Population

J. S. Deneva, J. M. Cordes, T. J. W. Lazio

备注：
Accepted to ApJ Letters
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摘要：

我们报告发现了三颗中子星，它们的大色散测量值和与\sgr的角接近度表明银河系中心存在中子星。相对较长的周期（0.98至1.48秒）最有可能反映了我们用绿岸望远镜调查时使用的2 GHz观测频率下的无线电波散射对短周期类星体的强烈选择。其中一个天体（PSR J1746- 2850 I）的特征旋转减速年龄仅为13 kyr，并具有高表面磁场$\sim 4\times 10^{13}$ G。它和在同一望远镜指向中发现的第二个物体PSR J1746- 2850 II（在双星中具有最高的已知色散测量值）可能起源于拱或五重星团中最近的恒星形成。连同第三个天体PSR J 1745 -2910，以及Johnston等人（2006）报道的两个类似的高色散长周期脉冲星，到目前为止发现的五个天体距离\sgr 10到15角分，与银河系中心有大量脉冲星的情况一致，其大多数成员在相对低频的勘测中是不可检测的，这是因为来自相同散射体积的脉冲展宽，该散射体积角度展宽\sgr和OH/IR脉泽。

英文摘要：

We report the discovery of three pulsars whose large dispersion measures and angular proximity to \sgr indicate the existence of a Galactic center population of neutron stars. The relatively long periods (0.98 to 1.48 s) most likely reflect strong selection against short-period pulsars from radio-wave scattering at the observation frequency of 2 GHz used in our survey with the Green Bank Telescope. One object (PSR J1746-2850I) has a characteristic spindown age of only 13 kyr along with a high surface magnetic field $\sim 4\times 10^{13}$ G. It and a second object found in the same telescope pointing, PSR J1746-2850II (which has the highest known dispersion measure among pulsars), may have originated from recent star formation in the Arches or Quintuplet clusters given their angular locations. Along with a third object, PSR J1745-2910, and two similar high-dispersion, long-period pulsars reported by Johnston et al. (2006), the five objects found so far are 10 to 15 arc min from \sgr, consistent with there being a large pulsar population in the Galactic center, most of whose members are undetectable in relatively low-frequency surveys because of pulse broadening from the same scattering volume that angularly broadens \sgr and OH/IR masers.

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