Work

A study of periodic single-pulse emission behaviour in PSR J1819+1305 using L -band observations from the FAST

Year: 2026

Type: article

Abstract: ABSTRACT This paper reports a detailed study of the single pulses of PSR J1819+1305 using L-band observations from the FAST. Using the unprecedented ultra-high sensitivity of FAST, we observed PSR J1819+1305 to estimate its nulling period and fraction, identify its pulse nulling and burst states, and analyse its sub-pulse drifting, pulse profile and polarization properties. Based on the analysis of polarization, the magnetospheric configuration was constrained, and the emission heights were estimated. Our study reveal that single pulse of this pulsar displays a periodic nulling with a nulling fraction of $\sim 32.9 {{\ \rm per\ cent}}$ and nulling period of $50P_1$. Both values are smaller than those obtained from previous low-frequency (327 MHz and 430 MHz) observations. Analyses of single-pulse energy temporal variations further indicate notable differences in the average pulse profile geometries between the last burst pulse preceding the nulling state and the first burst pulse following it. Within the trailing component, we detected sub-pulse drifting with a period of $P_2= 2.08\pm 0.03 P_1$ and amplitude modulation with a period of $P_3=6.65\pm 0.04P_1$, where $P_1$ is spin period of PSR J1819+1305. Additionally, we determine the magnetic inclination angle $\alpha \approx 131.36^\circ$ and impact angle $\beta \approx 3.36^\circ$ of this pulsar using the RVM model and MCMC method, and further derive emission heights of $r_\mathrm{geo} = 735.76\pm 11.00$ km and $r_\mathrm{delay} = 782.36\pm 77.39$ km via the emission geometry and aberration-retardation correction methods, respectively. This study expands the multiband observational sample of pulsars with periodic nulling, amplitude modulation, and sub-pulse drifting, thereby laying a foundation for future studies of statistical and radiation mechanism.

Source: Monthly Notices of the Royal Astronomical Society

DOI: 10.1093/mnras/stag2009

Authors: L H Shang, Y Yu, Y L Liang

Institutions: Guizhou Normal University, Chinese Academy of Sciences, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology

Language: English

Topic: Pulsars and Gravitational Waves Research

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,046

Funders: National Natural Science Foundation of China, National Astronomical Observatories, Chinese Academy of Sciences