Detection of 16 Small Glitches in Nine Pulsars

Zhou, Z; Wang, Jingbo; Wang, Na; Yuan, Jianping; Kou, Feifei; Dang, S. J.

doi:10.1088/1674-4527/ac7d9c

Cited by 4 publications

(2 citation statements)

References 47 publications

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“…Although glitches were reported to occur in five pulsars (PSRs J0215+6218, J0502+4654, J0601−0527, J0855−3331, and J2225+6535), we include these pulsars in this paper, as these events have small magnitudes with ∆ν/ν < 6 × 10 −9 between MJD 52,616 and 55,965. For instance, two small glitches in J2225+6534 were detected with ∆ν/ν = 0.30(1) × 10 −9 and ∆ν/ν = 1.65(2) × 10 −9 using the Nanshan radio telescope [32]. The ephemerides of 85 sources were initially obtained from PSRCAT [27], and updated positions and rotational parameters (such as spin frequency, spin frequency first derivative, and second derivative) were calculated using TEMPO2 and the Cholesky method.…”

Section: Resultsmentioning

confidence: 99%

Characterizing Timing Noise in Normal Pulsars with the Nanshan Radio Telescope

Yuan,

Wang,

Dang

et al. 2024

Universe

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We present a decade of observations of pulse arrival times for 85 pulsars using the Nanshan radio telescope from July 2002 to March 2014. The Cholesky method can accurately estimate the covariance function of the timing residuals, significantly improving the parameter’s estimation accuracy when red noise is prominent. We utilize the Cholesky method to determine positions and basic timing parameters of these pulsars, as well as to obtain timing residuals. Most of these sources showed evidence of significant timing irregularities, which are described. The spectral analyses of timing residuals are presented for pulsars showing obvious red noise. Our results show that timing residuals in half of these pulsars are attributed to rotational irregularities. The red noise in normal pulsars may originate from a random walk in spin frequency or spin-down rate.

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Section: Resultsmentioning

confidence: 99%

Characterizing Timing Noise in Normal Pulsars with the Nanshan Radio Telescope

Yuan,

Wang,

Dang

et al. 2024

Universe

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“…Along with this drift, some pulsars show abrupt changes in spin period called "glitches" (Espinoza et al 2011;Fuentes et al 2017;Zhou et al 2022aZhou et al , 2022bBasu et al 2022). Theories to explain these events largely utilize either of the following:…”

Section: Introductionmentioning

confidence: 99%

The Green Bank North Celestial Cap Survey. IX. Timing Follow-up for 128 Pulsars

McEwen,

Swiggum,

Kaplan

et al. 2024

ApJ

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The Green Bank North Celestial Cap survey is one of the largest and most sensitive searches for pulsars and transient radio objects. Observations for the survey have finished; priorities have shifted toward long-term monitoring of its discoveries. In this study, we have developed a pipeline to handle large data sets of archival observations and connect them to recent, high-cadence observations taken using the Canadian Hydrogen Intensity Mapping Experiment telescope. This pipeline handles data for 128 pulsars and has produced measurements of spin, positional, and orbital parameters that connect data over observation gaps as large as 2000 days. We have also measured glitches in the timing residuals for five of the pulsars included and proper motion for 19 sources (13 new). We include updates to orbital parameters for 19 pulsars, including nine previously unpublished binaries. For two of these binaries, we provide updated measurements of post-Keplerian binary parameters, which result in much more precise estimates of the total masses of both systems. For PSR J0509+3801, the much improved measurement of the Einstein delay yields much improved mass measurements for the pulsar and its companion, 1.399(6) M ⊙ and 1.412(6) M ⊙, respectively. For this system, we have also obtained a measurement of the orbital decay due to the emission of gravitational waves, P ̇ B = − 1.37 ( 7 ) × 10 − 12 , which is in agreement with the rate predicted by general relativity for these masses.

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Timing irregularities and glitches from the pulsar monitoring campaign at IAR

Zubieta,

García,

del Palacio

et al. 2024

A&A

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Pulsars have a very stable rotation overall. However, sudden increases in their rotation frequency, known as glitches, perturb their evolution. While many observatories commonly detect large glitches, small glitches are harder to detect because of the lack of daily cadence observations over long periods of time (years). We aim to explore and characterise the timing behaviour of young pulsars on daily timescales, looking for small glitches and other irregularities, in order to further our comprehension of the real distribution of glitch sizes. Our findings have consequences for the theoretical modelling of the glitch mechanism. We observed six pulsars with up to daily cadence between December 2019 and January 2024 with the two antennas of the Argentine Institute of Radio Astronomy (IAR). We used standard pulsar timing tools to obtain the times of arrival of the pulses and to characterise the pulsar's rotation. We developed an algorithm to look for small timing events in the data and calculate the changes in the frequency (nu ) and its derivative ($ at those epochs. We find that the rotation of all pulsars in this dataset is affected by small step changes in nu and $ Among them, we find three new glitches that have not been reported before: two glitches in PSR J1048$-$5832 with relative sizes of $ $ and $ $, and one glitch in the Vela pulsar with a size of $ $. We also report new decay terms on the 2021 Vela giant glitch, and on the 2022 giant glitches in PSR J0742$-$2822 and PSR J1740$-$3015, respectively. In addition, we find that the red noise contribution significantly diminished in PSR J0742$-$2822 after its giant glitch in 2022. Our results highlight the importance of high-cadence monitoring with an exhaustive analysis of the residuals to better characterise the distribution of glitch sizes and to deepen our understanding of the mechanisms behind glitches, red noise, and timing irregularities.

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Detection of 16 Small Glitches in Nine Pulsars

Cited by 4 publications

References 47 publications

Characterizing Timing Noise in Normal Pulsars with the Nanshan Radio Telescope

Characterizing Timing Noise in Normal Pulsars with the Nanshan Radio Telescope

The Green Bank North Celestial Cap Survey. IX. Timing Follow-up for 128 Pulsars

Timing irregularities and glitches from the pulsar monitoring campaign at IAR

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