The Timing Behavior of the Central Compact Object Pulsar 1E 1207.4−5209
The Timing Behavior of the Central Compact Object Pulsar 1E 1207.4−5209
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中央致密天体 Pulsar 1E 1207.4−5209 的计时行为
DOI：
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发表时间：
2020
影响因子：
4.9
通讯作者：
J. Halpern
中科院分区：
文献类型：
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作者：
E. Gotthelf;J. Halpern
我们展示了超新星遗迹 PKS 1209−51/52 中的中心致密天体 1E 1207.4−5209 20 年的计时观测，以跟进我们在其自旋下降过程中检测到的意外计时故障。使用新的 XMM-Newton 和 NICER 对 1E 1207.4−5209 的观测，我们现在发现相位星历表可以通过两个小故障或极端定时噪声很好地建模。频率毛刺的隐含幅度分别为 2010.9 和 2014.4 时期的 和 。更新的定时解决方案还排除了我们之前关于频率导数中存在大毛刺的建议。没有其他具有如此小的自旋速率（Hz s−1）或表面偶极子磁场强度（G）的规范脉冲星被观察到出现故障； 1E 1207.4−5209 的毛刺活动参数比能量更高的脉冲星更大。不涉及毛刺的替代参数化可以拟合数据，但它们的定时残差或二阶频率导数比具有类似自旋下降参数的脉冲星大几个数量级。 1E 1207.4−5209 的这些定时特性进一步激发了中心致密天体的主导理论，即正常强度的初始 B 场通过超新星抛射物的后退被埋在中子星地壳中，抑制了表面偶极子场。隐藏场的缓慢重新出现可能涉及触发毛刺或过多的定时噪声。
We present 20 yr of timing observations for 1E 1207.4−5209, the central compact object in supernova remnant PKS 1209−51/52, to follow up on our detection of an unexpected timing glitch in its spin-down. Using new XMM-Newton and NICER observations of 1E 1207.4−5209, we now find that the phase ephemeris can be well modeled by either two small glitches, or extreme timing noise. The implied magnitudes of the frequency glitches are and , at epochs 2010.9 and 2014.4, respectively. The updated timing solutions also rule out our previous suggestion of a large glitch in the frequency derivative . No other canonical pulsar with such a small spin-down rate ( Hz s−1) or surface dipole magnetic field strength ( G) has been observed to glitch; the glitch activity parameter of 1E 1207.4−5209 is larger than that of more energetic pulsars. Alternative parameterizations that do not involve glitches can fit the data, but they have timing residuals or a second frequency derivative that are orders of magnitude larger than in pulsars with similar spin-down parameters. These timing properties of 1E 1207.4−5209 further motivate the leading theory of central compact objects, that an initial B-field of normal strength was buried in the neutron star crust by fallback of supernova ejecta, suppressing the surface dipole field. The slow reemergence of the buried field may be involved in triggering glitches or excess timing noise.