Nanohertz gravitational wave astronomy during SKA era: An InPTA perspective
Nanohertz gravitational wave astronomy during SKA era: An InPTA perspective
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DOI：
10.1007/s12036-022-09869-w
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发表时间：
2022-07
影响因子：
1.1
通讯作者：
B. C. Joshi;A. Gopakumar;A. Pandian;T. Prabu;L. Dey;M. Bagchi;S. Desai;P. Tarafdar;P. Rana;Y. Maan;Neelam Dhanda Batra;Raghav Girgaonkar;Nikita Agarwal;P. Arumugam;Sarmistha Banik Avishek Basu;A. Bathula;S. Dandapat;Y. Gupta;S. Hisano;R. Kato;D. Kharbanda;T. Kikunaga;N. Kolhe;M. Krishnakumar;P. K. Manoharan;Piyush Marmat;A. Naidu;K. Nobleson;A. K. Paladi;Dhruv Pathak;J. Singha;Aman K. Srivastava;M. Surnis;S. Susarla;A. Susobhanan;Keitaro Takahashi;National Centre for Radio Astrophysics India;Tata Institute of Fundamental Research India;Raman Research Institute India;The Institute of Mathetical Sciences India;Homi Bhabha National Institute India;Iit Hyderabad India;University Grants Commission and Ministry of Education. Gover India-University-Grants-Commission-and-Ministry-of-Gover-139043535;Amity University India;Manipal India;India India-India;UK JodrellBankCentreforAstrophysics;The Indian Institute of Science Education;Research India;Kumamoto University Japan;Faculty of Computer Science;Technology Kumamoto University Japan;Osaka Japan;Stringer India;M. F. R. Germany;Universitat Bielefeld Germany;A. Usa;UK UniversityofOxford;Bits Pilani Hyderabad Campus India;Indian Institute of Space Science;Technology Thiruvananthapuram India;Inter-University Centre for Astronomy;A. India;N. U. Ireland;National Astronomical Observatories of China;International Center of Quantum Artificial Intelligence for Science-International-Center-of-Quantum-Artificial-for-2047486588
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作者：
B. C. Joshi;A. Gopakumar;A. Pandian;T. Prabu;L. Dey;M. Bagchi;S. Desai;P. Tarafdar;P. Rana;Y. Maan;Neelam Dhanda Batra;Raghav Girgaonkar;Nikita Agarwal;P. Arumugam;Sarmistha Banik Avishek Basu;A. Bathula;S. Dandapat;Y. Gupta;S. Hisano;R. Kato;D. Kharbanda;T. Kikunaga;N. Kolhe;M. Krishnakumar;P. K. Manoharan;Piyush Marmat;A. Naidu;K. Nobleson;A. K. Paladi;Dhruv Pathak;J. Singha;Aman K. Srivastava;M. Surnis;S. Susarla;A. Susobhanan;Keitaro Takahashi;National Centre for Radio Astrophysics India;Tata Institute of Fundamental Research India;Raman Research Institute India;The Institute of Mathetical Sciences India;Homi Bhabha National Institute India;Iit Hyderabad India;University Grants Commission and Ministry of Education. Gover India-University-Grants-Commission-and-Ministry-of-Gover-139043535;Amity University India;Manipal India;India India-India;UK JodrellBankCentreforAstrophysics;The Indian Institute of Science Education;Research India;Kumamoto University Japan;Faculty of Computer Science;Technology Kumamoto University Japan;Osaka Japan;Stringer India;M. F. R. Germany;Universitat Bielefeld Germany;A. Usa;UK UniversityofOxford;Bits Pilani Hyderabad Campus India;Indian Institute of Space Science;Technology Thiruvananthapuram India;Inter-University Centre for Astronomy;A. India;N. U. Ireland;National Astronomical Observatories of China;International Center of Quantum Artificial Intelligence for Science-International-Center-of-Quantum-Artificial-for-2047486588
在脉冲星定时阵列实验中对毫秒脉冲星进行了长达数十年的监测，这些脉冲星呈现出高度稳定的自转周期，即将发现纳赫兹随机引力波背景。本文描述了印度脉冲星定时阵列(INPTA)实验，该实验利用升级后的巨型梅雷波射电望远镜(UGMRT)对毫秒脉冲星集合进行计时。我们重点介绍了INPTA的观测策略和分析方法，这些策略和分析方法与未来使用更灵敏的平方公里阵列(SKA)望远镜进行的PTA实验相关。我们表明，INPTA独特的多子阵多频带宽带频率覆盖，为PTA脉冲星(例如PSR J1909-3744的PC CM)提供了前所未有的精度的色散测量估计。将SKA-LOW和SKA-MID分别配置为两个和四个子阵，结果表明，对于较大的62颗脉冲星样本，使用与INPTA所追求的类似的观测策略，SKA-MID和SKA-MID望远镜的每个历元分别需要约26小时和7小时，可以实现相当的精度。我们还回顾了正在进行的开发与PTA相关的广义相对论结构的努力，这些结构将需要从像Blaazar OJ(287)这样的孤立的超大质量黑洞双星系统中搜索纳赫兹引力波。这些努力应该与在即将到来的SKA望远镜、30米望远镜和下一代事件视界望远镜时代追求持久的多信使引力波天文学有关。
Decades long monitoring of millisecond pulsars, which exhibit highly stable rotational periods in pulsar timing array experiments is on the threshold of discovering nanohertz stochastic gravitational wave background. This paper describes the Indian pulsar timing array (InPTA) experiment, which employs the upgraded Giant Metrewave Radio Telescope (uGMRT) for timing an ensemble of millisecond pulsars for this purpose. We highlight InPTA’s observation strategies and analysis methods, which are relevant for a future PTA experiment with the more sensitive Square Kilometer Array (SKA) telescope. We show that the unique multi-sub-array multi-band wide-bandwidth frequency coverage of the InPTA, provides dispersion measure estimates with unprecedented precision for PTA pulsars, e.g.,pc cmfor PSR J1909-3744. Configuring the SKA-low and SKA-mid as two and four sub-arrays, respectively, it is shown that comparable precision is achievable, using observation strategies similar to those pursued by the InPTA, for a larger sample of 62 pulsars, requiring about 26 and 7 h per epoch for the SKA-mid and the SKA-low telescopes, respectively. We also review the ongoing efforts to develop PTA-relevant general relativistic constructs that will be required to search for nanohertz gravitational waves from isolated super-massive black hole binary systems like blazar OJ 287. These efforts should be relevant to pursue persistent multi-messenger gravitational wave astronomy during the forthcoming era of the SKA telescope, the thirty meter telescope, and the next-generation event horizon telescope.