The Indian Pulsar Timing Array: First data release

The Indian Pulsar Timing Array: First data release
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印度脉冲星计时阵列:首次数据发布

DOI:
10.1017/pasa.2022.46
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发表时间:
2022
影响因子:
6.3
通讯作者:
Tarafdar et. al
Tarafdar et. al
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Ryota Ikeda;Ken-ichi Tadaki;Daisuke Iono;Takuma Izumi;Yusei Koyama;Rhythm Shimakawa;Ichi Tanaka;Masao Hayashi;Tadayuki Kodama;Kotaro Kohno;Bunyo Hatsukade;Tomoko L. Suzuki;Yoichi Tamura;Tarafdar et. al

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本文给出了利用升级后的巨型米波射电望远镜在300 - 500 MHz和1260 - 1460 MHz频段同时观测到的14颗毫秒脉冲星的脉冲到达时间和高精度色散测量估计。这些数据跨越了3.5年(2018-2021)的基线,是印度脉冲星定时阵列合作提供的第一个官方数据。该数据的发布为研究低频星际介质效应及其对脉冲星定时阵列实验计时精度的影响提供了一个独特的机会。除了使用窄带和宽带定时技术获得色散测量时间序列和脉冲到达时间外,我们还对选定的脉冲星进行了色散测量结构函数分析。我们正在进行的关于色散措施的频率依赖性的研究已经讨论。根据对5颗毫秒脉冲星的初步分析,我们没有发现色散测量中色度的确凿证据。在这项工作中,首次提出了定期同时双频率观测的数据。这一独特的特征使我们获得了迄今为止对样本子集获得的最高精度的离散度测量估计。300 - 500 MHz和1260 - 1460 MHz的巨型米波射电望远镜同步多波段升级观测对于高精度色散测量估计和在不久的将来扩大脉冲星定时阵列联盟数据的整体频率覆盖范围至关重要。在这项工作中提供的部分数据预计将被纳入即将发布的国际脉冲星定时阵列的第三次数据发布。
We present the pulse arrival times and high-precision dispersion measure estimates for 14 millisecond pulsars observed simultaneously in the 300 500 MHz and 1260 1460 MHz frequency bands using the upgraded Giant Metrewave Radio Telescope. The data spans over a baseline of 3.5 years (2018-2021), and is the first official data release made available by the Indian Pulsar Timing Array collaboration. This data release presents a unique opportunity for investigating the interstellar medium effects at low radio frequencies and their impact on the timing precision of pulsar timing array experiments. In addition to the dispersion measure time series and pulse arrival times obtained using both narrowband and wideband timing techniques, we also present the dispersion measure structure function analysis for selected pulsars. Our ongoing investigations regarding the frequency dependence of dispersion measures have been discussed. Based on the preliminary analysis for five millisecond pulsars, we do not find any conclusive evidence of chromaticity in dispersion measures. Data from regular simultaneous two-frequency observations are presented for the first time in this work. This distinctive feature leads us to the highest precision dispersion measure estimates obtained so far for a subset of our sample. Simultaneous multi-band upgraded Giant Metrewave Radio Telescope observations in 300 500 MHz and 1260 1460 MHz are crucial for high-precision dispersion measure estimation and for the prospect of expanding the overall frequency coverage upon the combination of data from the various Pulsar Timing Array consortia in the near future. Parts of the data presented in this work are expected to be incorporated into the upcoming third data release of the International Pulsar Timing Array.
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