Refractive and Diffractive Scintillation of the Pulsar PSR B0329+54

Details Refractive and Diffractive Scintillation of the Pulsar PSR B0329+54 Refractive and Diffractive Scintillation of the Pulsar PSR B0329+54

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...460..460s&link_type=abstract

Astrophysical Journal v.460, p.460

Astronomy and Astrophysics

Astronomy

21

Ism: Structure, Stars: Pulsars: Individual Alphanumeric: Psr B0329+54, Radio Continuum: Stars

Scientific paper

Refractive and diffractive scintillation are thought to be two related consequences of scattering in the interstellar medium. The predicted modulation of diffractive scintillation parameters by refractive effects has not been thoroughly tested, however. We report 24 days of scintillation observations of the radio pulsar PSR B0329+54 from 1993 September to 1994 June with a 26 m telescope operating at 610 MHz. Dynamic spectra were obtained on each day, from which the characteristic bandwidth and timescale of the diffractive scintillation pattern were determined. A relative flux value for the pulsar was also obtained on each day. The cross-correlation coefficient for each unique pair of the observables flux, δF, bandwidth, δv, and timescale, δt was formed from these data. The observed values of these coefficients and their 67% confidence-intervals are: CδFδv = -0.4±0.2, CδFδt = -07±0 1 and Cδvδt = 0.5±0.2. Theoretical expectations are that CδFδv = -0.8, Cδvδt = -0.6, and Cδvδt = 0.8. We conclude that we have detected the expected modulation of diffractive parameters by refractive scintillation. This adds confidence to the interpretation that diffractive and refractive scintillation of compact radio sources are caused by the same underlying scattering process.

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