SKA时代的纳赫兹引力波天文学：InPTA的视角
高能天体物理现象
2022-12-21 v1 天体物理仪器与方法
太阳与恒星天体物理
摘要
对具有高度稳定自转周期的毫秒脉冲星长达数十年的监测，在脉冲星计时阵列实验中正处于发现纳赫兹随机引力波背景的门槛上。本文描述了印度脉冲星计时阵列（InPTA）实验，其利用升级后的巨型米波射电望远镜（uGMRT）对一组毫秒脉冲星进行计时以达成此目的。我们强调InPTA的观测策略与分析方法，这些对未来使用更灵敏的平方公里阵列（SKA）望远镜的PTA实验具有相关性。我们表明，InPTA独特的多子阵多波段宽带宽频率覆盖为PTA脉冲星提供了前所未有的精度色散量估计，例如对PSR J1909-3744约为2 x 10{-5} pc-cm{-3}。将SKA-low和SKA-mid分别配置为两个和四个子阵列，研究表明，采用与InPTA类似的观测策略，可对更大的62颗脉冲星样本实现可比精度，SKA-mid和SKA-low望远镜每历元分别约需26和7小时。我们还回顾了为搜索来自孤立超大质量黑洞双星系统（如耀变体OJ 287）的纳赫兹引力波所需的PTA相关广义相对论构件的持续开发努力。这些努力应有助于在即将到来的SKA望远镜、三十米望远镜和下一代事件视界望远镜时代开展持久的多信使引力波天文学。
引用
@article{arxiv.2207.06461,
title = {Nanohertz Gravitational Wave Astronomy during the SKA Era: An InPTA perspective},
author = {Bhal Chandra Joshi and Achamveedu Gopakumar and Arul Pandian and Thiagaraj Prabu and Lankeswar Dey and Manjari Bagchi and Shantanu Desai and Pratik Tarafdar and Prerna Rana and Yogesh Maan and Neelam Dhanda Batra and Raghav Girgaonkar and Nikita Agarwal and Paramasivan Arumugam and Sarmistha Banik and Avishek Basu and Adarsh Bathula and Subhajit Dandapat and Yashwant Gupta and Shinnosuke Hisano and Ryo Kato and Divyansh Kharbanda and Tomonosuke Kikunaga and Neel Kolhe and M. A. Krishnakumar and P. K. Manoharan and Piyush Marmat and Arun Naidu and K. Nobleson and Avinash Kumar Paladi and Dhruv Pathak and Jaikhomba Singha and Aman Srivastava and Mayuresh Surnis and Sai Chaitanya Susarla and Abhimanyu Susobhanan and Keitaro Takahashi},
journal= {arXiv preprint arXiv:2207.06461},
year = {2022}
}
备注
Accepted for publication in Journal of Astronomy and Astrophysics for Special Issue on Indian Participation in the SKA (Editors : Abhirup Datta, Nirupam Roy, Preeti Kharb and Tirthankar Roy Choudhury)