On the pulsar spin frequency derivatives and the glitch activity

Eya, Innocent O.; Alhassan, J. A.; Iyida, E. U.; Chukwude, A. E.; Urama, J. O.

doi:10.1007/s10509-022-04059-0

Cited by 2 publications

(5 citation statements)

References 56 publications

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“…With the spin frequency derivative (panels (B) and (G)) the relationship with the activity parameters is very strong. The glitch activity increases with an increase in frequency derivative just as earlier reported by some authors (e.g., Urama & Okeke 1999;Lyne et al 2000;Fuentes et al 2017;Eya et al 2022). This finding is just another support to the notion that glitches are driven by pulsar spin-down rate.…”

Section: Activity Parameters Of Pulsars Without Records Of Glitchessupporting

confidence: 84%

“…The spin parameters and the activity parameters of the sampled pulsars are presented in Table 1. As in Table 1 and as also seen in other analyses (for example see Urama & Okeke 1999;Lyne et al 2000;Espinoza et al 2011;Eya et al 2022), the magnitude of the activity parameter in a given pulsar is mainly dominated by the number of large glitches (Δν/ν > 10 −7 ) in such a pulsar at that period. This is because the addition of let us say glitch sizes of Δν/ν > 10 −9 to Δν/ν > 10 −7 will require up to hundreds of such small glitches to effectively alter the magnitude of Δν/ν > 10 −7 .…”

Section: The Glitch Activity Parametersupporting

confidence: 81%

“…Therefore, estimating the activity parameter from the spin parameter can provide a connection between the crust and the interior. Previous studies have concentrated on the linear relationship between the activity parameter and a selected spin parameter (e.g., Link et al 1999;Urama & Okeke 1999;Lyne et al 2000;Wang et al 2000;Andersson et al 2012;Fuentes et al 2017;Eya et al 2019aEya et al , 2022. However, our analysis explores a different relationship between these parameters and finds that a quadratic fit provides a better fit to the data [see Figure 4 and Table 2, especially the magnitude R 2 and n res ].…”

Section: Discussionmentioning

confidence: 89%

“…However, the paucity of glitch events in many pulsars is now a bane to a comprehensive understanding of the nature of neutron star interior via glitch activity parameters. Hence, there is a need to devise other means of quantifying the expected activity parameters of pulsars (see Eya et al 2022, for a recent attempt). If that is done, it will give an insight into the expected activity parameter of pulsars without glitches.…”

Section: Introductionmentioning

confidence: 99%

“…Many analysts have focused on the statistical study of glitch events either in individual pulsars or in ensembles of pulsars (e.g., Lyne et al 2000;Melatos et al 2008;Espinoza et al 2011;Eya et al 2014;Fuentes et al 2017;Eya et al 2019bEya et al , 2022. One of the major findings of this approach that has stood the test of time, and which stands alone in the field, is that the number, frequency, and size of glitches decrease as a pulsar ages (Eya et al 2017b;Basu et al 2022;Eya et al 2022, and as also shown in Figure 1). In that, it could be said that the trigger of glitches in pulsars is agedependent.…”

Section: Introductionmentioning

confidence: 99%

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Pulsar Glitch Activities: The Spin Parameters Approach

Eya,

Iyida

2024

Res. Astron. Astrophys.

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Glitch activity refers to the mean increase in pulsar spin frequency per year due to rotational glitches. It is an important tool for studying super-nuclear matter using neutron star interiors as templates. Glitch events are typically observed in the spin frequency ($\nu$) and frequency derivative ($\dot{\nu}$) of pulsars. The rate of glitch recurrence decreases as the pulsar ages, and the activity parameter is usually measured by linear regression of cumulative glitches over a given period. This method is effective for pulsars with multiple regular glitch events. However, due to the scarcity of glitch events and the difficulty of monitoring all known pulsars, only a few have multiple records of glitch events. This limits the use of the activity parameter in studying neutron star interiors with multiple pulsars. In this study, we examined the relationship between the activity parameters and pulsar spin parameters (spin frequency, frequency derivative, and pulsar characteristic age). We found that a quadratic function provides a better fit for the relationship between activity parameters and spin parameters than the commonly used linear functions. Using this information, we were able to estimate the activity parameters of other pulsars that do not have records of glitches. Our analysis shows that the relationship between the estimated activity parameters and pulsar spin parameters is consistent with that of the observed activity parameters in the ensemble of pulsars.

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Section: Activity Parameters Of Pulsars Without Records Of Glitchessupporting

confidence: 84%

Section: The Glitch Activity Parametersupporting

confidence: 81%

Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pulsar Glitch Activities: The Spin Parameters Approach

Eya,

Iyida

2024

Res. Astron. Astrophys.

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Pulsar Glitches: A Review

et al. 2022

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∼6% of all known pulsars have been observed to exhibit sudden spin-up events, known as glitches. For more than fifty years, these phenomena have played an important role in helping to understand pulsar (astro)physics. Based on the review of pulsar glitches search method, the progress made in observations in recent years is summarized, including the achievements obtained by Chinese telescopes. Glitching pulsars demonstrate great diversity of behaviours, which can be broadly classified into four categories: normal glitches, slow glitches, glitches with delayed spin-ups, and anti-glitches. The main models of glitches that have been proposed are reviewed and their implications for neutron star structure are critically examined regarding our current understanding. Furthermore, the correlations between glitches and emission changes, which suggest that magnetospheric state-change is linked to the pulsar-intrinsic processes, are also described and discussed in some detail.

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On the pulsar spin frequency derivatives and the glitch activity

Cited by 2 publications

References 56 publications

Pulsar Glitch Activities: The Spin Parameters Approach

Pulsar Glitch Activities: The Spin Parameters Approach

Pulsar Glitches: A Review

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