Distribution of interstellar plasma in the direction of PSR B0525+21 from data obtained on a ground–space interferometer


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Observations on the RadioAstron ground–space interferometer with the participation of the Green Bank and Arecibo ground telescopes at 1668 MHz have enabled studies of the characteristics of the interstellar plasma in the direction of the pulsar PSR B0525+21. The maximum projected baseline for the ground–space interferometer was 233 600 km. The scintillations in these observations were strong, and the spectrum of inhomogeneties in the interstellar plasma was a power law with index n = 3.74, corresponding to a Kolmogorov spectrum. A new method for estimating the size of the scattering disk was applied to estimate the scattering angle (scattering disk radius) in the direction toward PSR B0525+21, θscat = 0.028 ± 0.002 milliarcsecond. The scattering in this direction occurs in a plasma layer located at a distance of 0.1Z from the pulsar, where Z is the distance from the pulsar to the observer. For the adopted distance Z = 1.6 kpc, the screen is located at a distance of 1.44 kpc from the observer.

Sobre autores

A. Andrianov

Astro Space Center, Lebedev Physical Institute

Autor responsável pela correspondência
Email: andrian@asc.rssi.ru
Rússia, Moscow, 117997

T. Smirnova

Pushchino Radio Astronomy Observatory, Astro Space Center

Email: andrian@asc.rssi.ru
Rússia, Pushchino

V. Shishov

Pushchino Radio Astronomy Observatory, Astro Space Center

Email: andrian@asc.rssi.ru
Rússia, Pushchino

C. Gwinn

University of California at Santa Barbara

Email: andrian@asc.rssi.ru
Estados Unidos da América, Santa Barbara, California

M. Popov

Astro Space Center, Lebedev Physical Institute

Email: andrian@asc.rssi.ru
Rússia, Moscow, 117997

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