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Particle Outflow and Pulsar Timing Noise. Based on: Chin. Phys. Lett. Vol. 28, No. 1 (2011) 019701. Xiong Wei Liu. Department of Astronomy, Peking University. 2011-05-09. Outline. Background; Our Model; Observational Checking; Discussion. Background. Theoretically, pulsars spin stably

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particle outflow and pulsar timing noise

Particle Outflow and Pulsar Timing Noise

Based on: Chin. Phys. Lett. Vol. 28, No. 1 (2011) 019701

Xiong Wei Liu

Department of Astronomy, Peking University


  • Background;
  • Our Model;
  • Observational Checking;
  • Discussion.


Theoretically, pulsars spin stably

Standard Clock

GW detection

Observationally, timing niose exist everywhere



Explainations for timing noise:

a. unmodelled companions;

b. gravitational waves;

c. free-precession of neutron star.


But, timing noise still can’t be eliminated completely, especially the noise in long timescale of years.


Our Model

Main Idea: A new kind of intrinsic Timing Noise of pulsar

Theoretical Basis: The Partical outflow from a pulsar should be unstable,so is the spin of the pulsar

(Xu & Qiao 2001 ApJL. 561 L85)

is the power carried away by relativistic particles which rise from unipolar induction, and is the power of magnetic dipole radiation.

is the variation.


Our Model

Observational Clue: Variations of flux density may indicate

the variations of particle outflow


Our Model

Theoretical Result: The relationship between variations of particle outflow and Timing Noise

The longer, the stronger the noise!


Our Model


Variations of particle outflow

Timing noise


Our Model

Resemble with observations: Profile feature, range feature

and time dependence


Observational Checking

Checking 1: Relationship between Timing Noises and

distribution of pulsars

Estimate from


Observational Checking

Checking 2: Relationship between spin frequency, frequency derivative and Timing Noise

Statistics from approximately

450 distinct pulsars

Ryan M. et al. (arXiv:1010.4794v1)


Observational Checking

Checking 3: Random walks in frequency and frequency derivative–Phenomenon and the essence

Cordes & Downs (1985) and D’Alessandro et al.(1995)

Ryan M. et al. (arXiv:1010.4794v1)



New mechanism of TN: The fluctuation of particle outflow can lead to significant timing noise in long time span of years.

New Challenges: Intrinsic Timing Noise, unavoidable!

The millisecond pulsars chose to detecting GW or act as Standard Clock, which haven’t found signigicant long time span TNs, will effect by their intrinsic TNs in longer time

New Question: How to avert the bad effect of this kind of TNs?

Thank you!