Dispersion

Dispersion measure

Dispersion measure

Dispersion measure (DM) is a measure of the dispersion of a signal, i.e., the phenomenon of the duration of a short signal growing longer as it travels.

  1. What causes dispersion measure?
  2. Does the pulsar period depend on frequency?

What causes dispersion measure?

Origin of Dispersion Measure

In the presence of charged particles such as protons and electrons, the electrostatic interaction between the light and the charged particles causes a delay in the propagation of the light, with the delay being a function of radio frequency and the masses of the charged particles.

Does the pulsar period depend on frequency?

Since the period of a pulsar is just the length of time it takes for the star to rotate, the period is the same no matter what frequency your radio telescope is tuned to.

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