Observations of Nine Millisecond Pulsars at 8600 MHz Using the TMRT
Observations of Nine Millisecond Pulsars at 8600 MHz Using the TMRT
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DOI：
10.3847/1538-4357/ad0724
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发表时间：
2024-01
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通讯作者：
Xiao-Wei 啸威 Wang 王;Zhen 振 Yan 闫;Z. Shen 沈;Hao 号 Tong 仝;Xia 霞 Zhou 周;Rong-Bing 融冰 Zhao 赵;Ya-Jun 亚军 Wu 吴;Zhi-Peng 志鹏 Huang 黄;Rui 睿 Wang 王;Jie 杰 Liu 刘
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作者：
Xiao-Wei 啸威 Wang 王;Zhen 振 Yan 闫;Z. Shen 沈;Hao 号 Tong 仝;Xia 霞 Zhou 周;Rong-Bing 融冰 Zhao 赵;Ya-Jun 亚军 Wu 吴;Zhi-Peng 志鹏 Huang 黄;Rui 睿 Wang 王;Jie 杰 Liu 刘
本文报道了上海天马射电望远镜在2250和8600 MHz同时观测的9个8600 MHz毫秒双星的探测结果。主要利用2250 MHz更新的星历观测数据，通过多历元相干叠加，成功地获得了所有9个8600 MHz MSP的综合剖面（3 - 83个历元）观测数据，跨度从19 - 1210天，这大大增加了具有已发布配置文件的MSP的数量（从4到11），因为我们的目标MPSs中有7个之前没有相关结果。结合我们的新的通量密度和脉冲宽度的测量与以前的低频结果，我们研究了他们的集成配置文件的演变和光谱行为在更宽的频率范围内。我们发现它们的成分分离和脉冲宽度几乎保持不变，这与以前的研究结果是一致的。虽然在低频率下存在集成配置文件的急剧演变，但我们观察到在8个MSP中约5 GHz的相关演变的潜在结束。四个MSP的光谱被发现偏离一个单一的幂律，我们适合他们与一个破碎的幂律。PSR J1713 + 0747在MJD 59320 − 59321附近开始的变化，似乎随着观测频率的增加而变得更加突出。与星际介质的影响相比，我们更愿意将这一事件解释为磁层的某些变化。我们还发现其综合特征可能直到MJD 59842 - 59857才恢复到事件前状态。
We report detection results of nine millisecond pulsars (MSPs) at 8600 MHz using simultaneous 2250 and 8600 MHz observations conducted with the Shanghai Tian Ma Radio Telescope. Mainly benefiting from updated ephemerids with 2250 MHz observations, integrated profiles of all nine MSPs at 8600 MHz are successfully obtained by coherently adding multi-epoch (3–83 epochs) observation data spanning from 19–1210 days, which significantly increases the number of MSPs with published profiles (from 4 to 11) above 8000 MHz, as seven of our target MPSs had no related results previously. Combining our new flux density and pulse width measurements with previous low-frequency results, we study their integrated profile evolution and spectral behaviors in a wider frequency range. We find their component separations and pulse widths remain almost constant, which is consistent with previous findings. While dramatic evolution of integrated profiles exists at low frequencies, we observe a potential end of the related evolution around 5 GHz in eight MSPs. The spectra of four MSPs are found to deviate from a single power law, and we fit them with a broken power law. The change in the profile of PSR J1713+0747, which started around MJD 59320−59321, seems to be more prominent as the observation frequency increases. Compared with the effects of the interstellar medium, we prefer to explain this event as some changes in the magnetosphere. We also find its integrated profile possibly had not recovered to the pre-event state until MJD 59842–59857.