Deviation of the arrival-time delay of pulses for the Crab pulsar from a quadratic frequency region

Details Deviation of the arrival-time delay of pulses for the Crab pulsar from a quadratic frequency region Deviation of the arrival-time delay of pulses for the Crab pulsar from a quadratic frequency region

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008arep...52..910k&link_type=abstract

Astronomy Reports, Volume 52, Issue 11, pp.910-916

Astronomy and Astrophysics

Astronomy

1

95.85.Bh, 97.60.Gb, 98.38.Am

Scientific paper

Our measurements of the arrival-time delays of radio pulses from the Crab pulsar, PSR B0531+21, at low frequencies 111, 63, and 44 MHz revealed additional delays compared to the usual quadratic frequency relation, Δ t( v) ∝ v -2. These additional delays are 65 ms between 63 MHz and 111 MHz—i.e., a factor of two longer than the pulsar’s period, i.e., a factor of five longer than the pulsar period—and cannot be explained by the “twisting” of the magnetic-field lines by the rotation of the pulsar. We suggest the model in which a previously unknown high-density plasma layer with a high electron concentration is present along the line of sight in the Crab nebula, causing an additional frequency-dependent delay of the observed radio pulses at low frequencies due to the contribution of the n {/e 2} v -4 term in the dispersion-delay formula. The parameters of this inferred layer have been derived: emission measure E M ≅ 4 × 106 pc/cm6, electron density n e ≅ 106 cm-3, depth along the line of sight d ≅ 4 × 10-6 pc, and electron temperature T e ≥ 2 × 106 K.

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