SIMBAD references

2004MNRAS.354...43W - Mon. Not. R. Astron. Soc., 354, 43-54 (2004/October-2)

Interpretation of parabolic arcs in pulsar secondary spectra.


Abstract (from CDS):

Pulsar dynamic spectra sometimes show organized interference patterns: these patterns have been shown to have power spectra that often take the form of parabolic arcs, or sequences of inverted parabolic arclets whose apexes themselves follow a parabolic locus. Here, we consider the interpretation of these arc and arclet features. We give a statistical formulation for the appearance of the power spectra, based on the stationary phase approximation to the Fresnel-Kirchoff integral. We present a simple analytic result for the power spectrum expected in the case of highly elongated images and a single-integral analytic formulation appropriate to the case of axisymmetric images. Our results are illustrated in both the ensemble-average and snapshot regimes. Highly anisotropic scattering appears to be an important ingredient in the formation of the observed arclets.

Abstract Copyright: 2004 RAS

Journal keyword(s): pulsars: general - ISM: general

Simbad objects: 3

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