Noise analysis of the Indian Pulsar Timing Array data release I
Abstract
The Indian Pulsar Timing Array (InPTA) collaboration has recently made its first official data release (DR1) for a sample of 14 pulsars using 3.5 years of uGMRT observations. We present the results of single-pulsar noise analysis for each of these 14 pulsars using the InPTA DR1. For this purpose, we consider white noise, achromatic red noise, dispersion measure (DM) variations, and scattering variations in our analysis. We apply Bayesian model selection to obtain the preferred noise models among these for each pulsar. For PSR J16003053, we find no evidence of DM and scattering variations, while for PSR J19093744, we find no significant scattering variations. Properties vary dramatically among pulsars. For example, we find a strong chromatic noise with chromatic index 2.9 for PSR J1939+2134, indicating the possibility of a scattering index that doesn't agree with that expected for a Kolmogorov scattering medium consistent with similar results for millisecond pulsars in past studies. Despite the relatively short time baseline, the noise models broadly agree with the other PTAs and provide, at the same time, well-constrained DM and scattering variations.
Keywords
Cite
@article{arxiv.2303.12105,
title = {Noise analysis of the Indian Pulsar Timing Array data release I},
author = {Aman Srivastava and Shantanu Desai and Neel Kolhe and Mayuresh Surnis and Bhal Chandra Joshi and Abhimanyu Susobhanan and Aurélien Chalumeau and Shinnosuke Hisano and Nobleson K. and Swetha Arumugam and Divyansh Kharbanda and Jaikhomba Singha and Pratik Tarafdar and P Arumugam and Manjari Bagchi and Adarsh Bathula and Subhajit Dandapat and Lankeswar Dey and Churchil Dwivedi and Raghav Girgaonkar and A. Gopakumar and Yashwant Gupta and Tomonosuke Kikunaga and M. A. Krishnakumar and Kuo Liu and Yogesh Maan and P K Manoharan and Avinash Kumar Paladi and Prerna Rana and Golam M. Shaifullah and Keitaro Takahashi},
journal= {arXiv preprint arXiv:2303.12105},
year = {2023}
}
Comments
Accepted for publication in PRD, 30 pages, 17 figures, 4 tables