2001/10/31 by Na Wang, N. Wang, R. N. Manchester +10 · 3 citations
Earth and Planetary Sciences · Physics and Astronomy · #Amplitude #Astronomy #Astrophysics #Crab Pulsar #Geophysics and Gravity Measurements #Glitch #Observatory #Optics #Physics #Pulsar #Pulsars and Gravitational Waves Research #Radio Astronomy Observations and Technology #Telescope #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2001.04926.x
published as Mon.Not.Roy.Astron.Soc. 328 (2001) 855 · 11 pages, 9 figures, 4 tables, accepted by MNRAS
arxiv created 2001/10/31 · openalex publication_date 2001/12/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A pulsar timing system has been operating in the 18-cm band at the Urumqi Astronomical Observatory 25-m telescope since mid-1999. Frequency resolution allowing de-dispersion of the pulsar signals is provided by a filterbank/digitizer system. Observations of 74 pulsars over more than 12 months have resulted in updated pulsar periods and period derivatives, as well as improved positions. Comparison with previous measurements showed that the changes in period and period derivative tend to have the same sign and to be correlated in amplitude. A model based on unseen glitches gives a good explanation of the observed changes, suggesting that long-term fluctuations in period and period derivatives are dominated by glitches. In 2000 July, we detected a glitch of relative amplitude in the Crab pulsar. The post-glitch decay appears similar to other large Crab glitches.