利用uGMRT观测到的PSR J1713+0747轮廓变化证据
高能天体物理现象
2021-08-18 v2
摘要
PSR J1713+0747是国际脉冲星计时阵列实验中最精确计时的脉冲星之一。该脉冲星在2021年4月16日(MJD 59320)与2021年4月17日(MJD 59321)之间出现了 abrupt 的轮廓形状变化。在本文中，我们报告了利用升级型巨型米波射电望远镜(uGMRT)在该事件前后对该脉冲星进行的多频率观测结果。我们展示了在Band 5(1260 MHz - 1460 MHz)与Band 3(300 MHz - 500 MHz)中观测到的轮廓变化。该脉冲星的计时分析显示伴随此次轮廓变化出现了扰动，随后以约天的时间尺度恢复。我们的数据表明，相较于将无色散性与DM凸起或散射凸起组合的模型，采用色散指数作为自由参数的模型更受青睐。我们确定频率依赖关系为。
引用
@article{arxiv.2107.04607,
title = {Evidence for profile changes in PSR J1713+0747 using the uGMRT},
author = {Jaikhomba Singha and Mayuresh P Surnis and Bhal Chandra Joshi and Pratik Tarafdar and Prerna Rana and Abhimanyu Susobhanan and Raghav Girgaonkar and Neel Kolhe and Nikita Agarwal and Shantanu Desai and T Prabu and Adarsh Bathula and Subhajit Dandapat and Lankeswar Dey and Shinnosuke Hisano and Ryo Kato and Divyansh Kharbanda and Tomonosuke Kikunaga and Piyush Marmat and Sai Chaitanya Susarla and Manjari Bagchi and Neelam Dhanda Batra and Arpita Choudhury and A Gopakumar and Yashwant Gupta and M A Krishnakumar and Yogesh Maan and P K Manoharan and K Nobleson and Arul Pandian and Dhruv Pathak and Keitaro Takahashi},
journal= {arXiv preprint arXiv:2107.04607},
year = {2021}
}
备注
Accepted for publication in MNRAS-Letters