Abstract t We determine spectral indices of 228 pulsars by using Parkes pulsar data observed at 1.4 GHz, among which 200 spectra are newly determined. The indices are distributed in the range from −4.84 to −0.46. Together with known pulsar spectra from literature, we tried to find clues to the pulsar emission process. The weak correlations between the spectral index, the spin-down energy loss rate and the potential drop in the polar gap ∆Ψ hint that emission properties are related to the particle acceleration process in a pulsar’s magnetosphere.
Keywords pulsars: general— radiation mechanisms: general— radio continuum: general
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