A Linear Decomposition Method to Analyze and Study Pulsar Mode Changes
Abstract
In this paper, we present the linear decomposition method (LDM), which we developed to detect and analyze pulsar profile variations and mode changing behaviour. We developed LDM utilizing the likelihood function approach assuming the Gaussian noise. The LDM projects pulse profiles onto significance-ordered orthonormal vector bases. We show that the method is similar to the principal component analysis (PCA), but LDM can handle more general situations. We use simulated dataset and data from the Kunming 40-m radio telescope to demonstrate the application of the LDM. We found that the LDM successfully identified mode changes for well-known mode-changing PSR B0329+54 and found a continuous pulse profile evolution for PSR B0355+54 . We also show that the LDM can be used to improve the timing precision for mode changing PSR B0329+54.
Cite
@article{arxiv.2503.03452,
title = {A Linear Decomposition Method to Analyze and Study Pulsar Mode Changes},
author = {Longfei Hao and Zhixuan Li and Faxin Shen and Yonghua Xu and Yuxiang Huang and Kejia Lee and Qingzheng Yu and Hongguang Wang},
journal= {arXiv preprint arXiv:2503.03452},
year = {2025}
}
Comments
10 pages, 10 figures, accepted for publication in ApJ