Fast radio burst detection in the presence of coloured noise

Authors

C. F. Zhang
J. W. Xu
Y. P. Men
X. H. Deng
Heng Xu
J. C. Jiang
B. J. Wang
K. J. Lee
J. Li
J. P. Yuan
Z. Y. Liu
Y. X. Huang
Y. H. Xu
Z. X. Li
L. F. Hao
J. T. Luo
S. Dai
R. Luo
Hassan Zakie
Z. Y. Ma

Document Type

Article

Publication Date

6-1-2021

Abstract

In this paper, we investigate the impact of correlated noise on fast radio burst (FRB) searching. We found that (1) the correlated noise significantly increases the false alarm probability; (2) the signal-to-noise ratios (S/N) of the false positives become higher; (3) the correlated noise also affects the pulse width distribution of false positives, and there will be more false positives with wider pulse width. We use 55-h observation for M82 galaxy carried out at Nanshan 26m radio telescope to demonstrate the application of the correlated noise modelling. The number of candidates and parameter distribution of the false positives can be reproduced with the modelling of correlated noise. We will also discuss a low S/N candidate detected in the observation, for which we demonstrate the method to evaluate the false alarm probability in the presence of correlated noise. Possible origins of the candidate are discussed, where two possible pictures, an M82-harboured giant pulse and a cosmological FRB, are both compatible with the observation.

Keywords

Data analysis, Radio continuum, Fast radio burst (FRB), Coloured noise

Divisions

PHYSICS

Funders

Chinese Academy of Sciences [Grant No: XDB23010200],Max-Planck Partner Group,National SKA program of China [Grant No: 2020SKA0120100],National Natural Science Foundation of China (NSFC) [Grant No: 11690024],CAS Cultivation Project for FAST Scientific

Publication Title

Monthly Notices of the Royal Astronomical Society

Volume

503

Issue

4

Publisher

Oxford University Press

Publisher Location

GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND