Size-waiting-time correlations in pulsar glitches
| Autor: | Melatos, A., Howitt, G., Fulgenzi, W. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | The Astrophysical Journal, Volume 863, Issue 2, article id. 196, 12 pp. (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-4357/aad228 |
| Popis: | Few statistically compelling correlations are found in pulsar timing data between the size of a rotational glitch and the time to the preceding glitch (backward waiting time) or the succeeding glitch (forward waiting time), except for a strong correlation between sizes and forward waiting times in PSR J0537-6910. This situation is counterintuitive, if glitches are threshold-triggered events, as in standard theories (e.g. starquakes, superfluid vortex avalanches). Here it is shown that the lack of correlation emerges naturally, when a threshold trigger is combined with secular stellar braking slower than a critical, calculable rate. The Pearson and Spearman correlation coefficients are computed and interpreted within the framework of a state-dependent Poisson process. Specific, falsifiable predictions are made regarding what objects currently targeted by long-term timing campaigns should develop strong size-waiting-time correlations, as more data are collected in the future. Comment: 27 pages, 5 figures, accepted for publication in The Astrophysical Journal |
| Databáze: | arXiv |
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