2017MNRAS.470.4307F


Query : 2017MNRAS.470.4307F

2017MNRAS.470.4307F - Mon. Not. R. Astron. Soc., 470, 4307-4329 (2017/October-1)

Radio pulsar glitches as a state-dependent Poisson process.

FULGENZI W., MELATOS A. and HUGHES B.D.

Abstract (from CDS):

Gross-Pitaevskii simulations of vortex avalanches in a neutron star superfluid are limited computationally to <=102 vortices and <=102 avalanches, making it hard to study the long-term statistics of radio pulsar glitches in realistically sized systems. Here, an idealized, mean-field model of the observed Gross-Pitaevskii dynamics is presented, in which vortex unpinning is approximated as a state-dependent, compound Poisson process in a single random variable, the spatially averaged crust-superfluid lag. Both the lag-dependent Poisson rate and the conditional distribution of avalanche-driven lag decrements are inputs into the model, which is solved numerically (via Monte Carlo simulations) and analytically (via a master equation). The output statistics are controlled by two dimensionless free parameters: α, the glitch rate at a reference lag, multiplied by the critical lag for unpinning, divided by the spin-down rate; and β, the minimum fraction of the lag that can be restored by a glitch. The system evolves naturally to a self-regulated stationary state, whose properties are determined by α/αc(β), where αc(β) ≃ β–1/2 is a transition value. In the regime α >= αc(β), one recovers qualitatively the power-law size and exponential waiting-time distributions observed in many radio pulsars and Gross-Pitaevskii simulations. For α ≪ αc(β), the size and waiting-time distributions are both power-law-like, and a correlation emerges between size and waiting time until the next glitch, contrary to what is observed in most pulsars. Comparisons with astrophysical data are restricted by the small sample sizes available at present, with <=35 events observed per pulsar.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: neutron - pulsars: general - stars: rotation - stars: rotation

Simbad objects: 10

goto Full paper

goto View the references in ADS

Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4908 1
2 PSR J0537-6910 Psr 05 37 46.66 -69 10 17.1           ~ 241 1
3 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2120 1
4 PSR J1119-6127 Psr 11 19 14.30 -61 27 49.5           ~ 352 1
5 PSR B1338-62 Psr 13 41 42.63 -62 20 20.7           ~ 119 1
6 PSR J1647-4552 Psr 16 47 10.18 -45 52 16.7           ~ 182 1
7 PSR B1737-30.2 Psr 17 40 33.82 -30 15 43.5           ~ 191 0
8 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 447 2
9 SNR G021.5-00.9 SNR 18 33 33.612 -10 34 07.69           ~ 407 1
10 PSR J1846-0258 Psr 18 46 24.94 -02 58 30.1           ~ 314 2

To bookmark this query, right click on this link: simbad:objects in 2017MNRAS.470.4307F and select 'bookmark this link' or equivalent in the popup menu


2021.08.02-14:38:42

© Université de Strasbourg/CNRS

    • Contact