PSR J1841-0500：一颗基本上不存在的射电脉冲星
PSR J1841-0500: a radio pulsar that mostly is not there
摘要：
在寻找磁星1 E 1841-045的射电脉动时，我们发现了不相关的脉冲星J 1841 -0500，其自转周期P=0.9 s，特征年龄为0.4 Myr。一年后，帕克斯望远镜在3 GHz发现，无线电发射停止从这颗明亮的脉冲星。580天后，排放恢复到以前的水平。两种开启状态期间的P点均为关闭状态平均值的250%。PSR J1841-0500是第二个极端间歇性脉冲星的例子，虽然它比PSR B1931+24有更长的关闭周期和更大的自旋下降率。这颗新脉冲星被ISM极大地散射，其拟合时间尺度参考1 GHz，tau_1=2 s。基于绿岸望远镜在5 GHz的偏振观测，到目前为止，观察到的两个状态之间的本征脉冲轮廓没有明显的变化，虽然不能排除相对较小的变化。它的旋转量是已知最大的，RM=-3000 rad/m^2，色散量DM=532 pc/cc，意味着沿视线的电子加权平均磁场强度很大，为7 microG。
英文摘要：
In a search for radio pulsations from the magnetar 1E 1841-045, we have discovered the unrelated pulsar J1841-0500, with rotation period P=0.9 s and characteristic age 0.4 Myr. One year after discovery with the Parkes telescope at 3 GHz, radio emission ceased from this bright pulsar. After 580 days, emission resumed as before. The P-dot during both on states is 250% of the average in the off state. PSR J1841-0500 is a second example of an extremely intermittent pulsar, although with a much longer off period and larger ratio of spin-down rates than PSR B1931+24. The new pulsar is hugely scattered by the ISM, with a fitted timescale referenced to 1 GHz of tau_1=2 s. Based on polarimetric observations at 5 GHz with the Green Bank Telescope, the intrinsic pulse profile has not obviously changed between the two on states observed so far, although relatively small variations cannot be excluded. The magnitude of its rotation measure is the largest known, RM=-3000 rad/m^2, and with a dispersion measure DM=532 pc/cc implies a large electron-weighted average magnetic field strength along the line of sight, 7 microG.
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