乌鲁木齐天文台RRAT J1819-1458定时观测
Timing observations of RRAT J1819-1458 at Urumqi Observatory
摘要：
本文报道了2007年4月至2008年3月期间利用乌鲁木齐25米射电望远镜在1.54 GHz进行的RRAT J1819-1458定时观测的结果。RRAT J1819-1458是一颗相对年轻且高度磁化的中子星，它是在帕克斯多束脉冲星巡天数据中发现的。在94小时的观测数据中，我们共检测到162个信噪比（S/Ns）高于5- $σ$阈值的RRAT J1819-1458的分散爆发。其中，5个爆发明显地表现出双分量结构。最强爆发的S/N为13.3。通过我们的数据测量的源DM为196.0 $\pm$ 0.4 pc cm $^{-3}$。定时位置，频率和它的一阶导数是使用标准的脉冲星定时技术对这些单独的爆发的到达时间确定的。与以往文献相比，提高了旋转参数求解的精度。我们的定时位置（2- $σ$误差）与其X射线对应物CXTROMJ181934.1 -145804的位置一致。简要讨论了定时噪声和单个短脉冲的相位起伏对定时残差的影响。定时残差的分布是双峰的，这不能很容易地用定时不规则性来解释。
英文摘要：
We report the timing-analysis results obtained for RRAT J1819-1458 from regular timing observations at 1.54 GHz using the Urumqi 25 m radio telescope between 2007 April to 2008 March. RRAT J1819-1458 is a relatively young and highly magnetized neutron star discovered by its sporadic short bursts in the Parkes Multibeam Pulsar Survey data. In 94 hrs of observation data, we detected a total of 162 dispersed bursts of RRAT J1819-1458 with the signal-to-noise ratios (S/Ns) above 5-$σ$ threshold. Among them, 5 bursts clearly show two-component structure. The S/N of the strongest burst is 13.3. The source's DM measured through our data is 196.0 $\pm$0.4 pc cm$^{-3}$. The timing position, frequency and its first derivative were determined using standard pulsar timing techniques on the arrival times of these individual bursts. The accuracy of the solved rotating parameters are improved comparing with that in previous publication. Our timing position with 2-$σ$ error is consistent with the position of its X-ray counterpart CXOU J181934.1-145804. The effect of timing noise and the phase fluctuation of the individual short bursts on the timing residuals is briefly discussed. The distribution of the timing residuals is bimodal, which cannot be explained readily by timing irregularity.
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