2019/08/29 by A. Parthasarathy, R. M. Shannon, S. Johnston +11
Physics and Astronomy · #Acoustics #Advanced Frequency and Time Standards #Amplitude #Astrophysics #Modulation (music) #Noise (video) #Optics #Parametrization (atmospheric modeling) #Physics #Pulsar #Pulsars and Gravitational Waves Research #Radio Astronomy Observations and Technology #astro-ph.HE #astro-ph.SR
paper · pdf · doi:10.1093/mnras/stz2383
arxiv created 2019/08/29 · openalex publication_date 2019/08/29 · arxiv updated 2019/09/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
ABSTRACT The smooth spin-down of young pulsars is perturbed by two non-deterministic phenomenon, glitches, and timing noise. Although the timing noise provides insights into nuclear and plasma physics at extreme densities, it acts as a barrier to high-precision pulsar timing experiments. An improved methodology based on the Bayesian inference is developed to simultaneously model the stochastic and deterministic parameters for a sample of 85 high-E radio pulsars observed for ∼10 yr with the 64-m Parkes radio telescope. Timing noise is known to be a red process and we develop a parametrization based on the red-noise amplitude (Ared) and spectral index (β). We measure the median Ared to be -10.4+1.8-1.7 yr3/2 and β to be -5.2+3.0-3.8 and show that the strength of timing noise scales proportionally to ν 1|ν |-0.6± 0.1, where ν is the spin frequency of the pulsar and ν is its spin-down rate. Finally, we measure significant braking indices for 19 pulsars and proper motions for 2 pulsars, and discuss the presence of periodic modulation in the arrival times of 5 pulsars.