PSR J1740+1000: A Young Pulsar Well Out of the Galactic Plane
PSR J1740+1000: A Young Pulsar Well Out of the Galactic Plane
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PSR J1740 1000：一颗远离银河平面的年轻脉冲星
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
A. Zepka
中科院分区：
文献类型：
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作者：
M. Mclaughlin;Z. Arzoumanian;J. Cordes;D. Backer;A. Lommen;D. Lorimer;A. Zepka
我们讨论PSR J1740+1000，最近发现的五个天体之一，在470 deg 2在430 MHz的305米阿雷西博望远镜的升级过程中搜索。周期P = 154 ms，周期导数τ = 2.1 × 10-14 s s-1，意味着自旋下降年龄τs = P/2 τ = 114 kyr，小于所有已知恒星的95%。这颗脉冲星的年轻和接近使其成为X射线和伽马射线能量探测的良好候选者。它的高银河纬度（B = 20.°4）表明，如果脉冲星诞生于银河系的中平面，并且它的运动学年龄等于它的自旋下降年龄，那么它的速度非常高。然而，星际间的振动表明速度要低得多。我们讨论了这种差异的可能解释，考虑到（1）可能的出生地点远离中平面;（2）来自未测量的径向速度的贡献;（3）不同于自旋下降年龄的运动学年龄;（4）来自北极支线的增强散射的闪烁速度的偏置。
We discuss PSR J1740+1000, one of five pulsars recently discovered in a search of 470 deg2 at 430 MHz during the upgrade of the 305 m Arecibo Telescope. The period P = 154 ms and period derivative Ṗ = 2.1 × 10-14 s s-1 imply a spin-down age τs = P/2Ṗ = 114 kyr that is smaller than 95% of all known pulsars. The youth and proximity of this pulsar make it a good candidate for detection at X-ray and gamma-ray energies. Its high Galactic latitude (b = 20.°4) suggests a very high velocity if the pulsar was born in the midplane of the Galaxy and if its kinematic age equals its spin-down age. Interstellar scintillations, however, suggest a much lower velocity. We discuss possible explanations for this discrepancy, taking into account (1) possible birth sites away from the midplane; (2) contributions from the unmeasured radial velocity; (3) a kinematic age different from the spin-down age; and (4) biasing of the scintillation velocity by enhanced scattering from the North Polar Spur.