Low-frequency wideband timing of InPTA pulsars observed with the uGMRT
Abstract
High-precision measurements of the pulsar dispersion measure (DM) are possible using telescopes with low-frequency wideband receivers. We present an initial study of the application of the wideband timing technique, which can simultaneously measure the pulsar times of arrival (ToAs) and DMs, for a set of five pulsars observed with the upgraded Giant Metrewave Radio Telescope (uGMRT) as part of the Indian Pulsar Timing Array (InPTA) campaign. We have used the observations with the 300-500 MHz band of the uGMRT for this purpose. We obtain high precision in DM measurements with precisions of the order 10^{-6}cm^{-3}pc. The ToAs obtained have sub-{\mu}s precision and the root-mean-square of the post-fit ToA residuals are in the sub-{\mu}s range. We find that the uncertainties in the DMs and ToAs obtained with this wideband technique, applied to low-frequency data, are consistent with the results obtained with traditional pulsar timing techniques and comparable to high-frequency results from other PTAs. This work opens up an interesting possibility of using low-frequency wideband observations for precision pulsar timing and gravitational wave detection with similar precision as high-frequency observations used conventionally.
Keywords
Cite
@article{arxiv.2112.06908,
title = {Low-frequency wideband timing of InPTA pulsars observed with the uGMRT},
author = {K Nobleson and Nikita Agarwal and Raghav Girgaonkar and Arul Pandian and Bhal Chandra Joshi and M A Krishnakumar and Abhimanyu Susobhanan and Shantanu Desai and T Prabu and Adarsh Bathula and Timothy T Pennucci and Sarmistha Banik and Manjari Bagchi and Neelam Dhanda Batra and Arpita Choudhary and Subhajit Dandapat and Lankeswar Dey and Yashwant Gupta and Shinnosuke Hisano and Ryo Kato and Divyansh Kharbanda and Tomonosuke Kikunaga and Neel Kolhe and Yogesh Maan and Piyush Marmat and P Arumugam and P K Manoharan and Dhruv Pathak and Jaikhomba Singha and Mayuresh P Surnis and Sai Chaitanya Susarla and Keitaro Takahashi},
journal= {arXiv preprint arXiv:2112.06908},
year = {2022}
}
Comments
Accepted for publication in MNRAS