Measurement of radio emission scattering parameters in the direction of pulsars B0809+74, B0919+06 and B1133+16 with ground-space interferometer RadioAstron

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Abstract

We present the analysis of observations of three pulsars at a frequency of 327 MHz with the ground-space interferometer RadioAstron. The main scintillation parameters were measured: the decorrelation bandwidth ∆fdif and the scintillation time ∆tdif. We have found that these parameters vary significantly over time. For PSR B1133+16, the decorrelation bandwidth ∆fdif varied from 100 kHz to 350 kHz from 2014 to 2018. For PSR B0919+06 ∆fdif varied from 36 kHz to 195 kHz over approximately the same time period. In the direction of the observed pulsars, the power-law indices for the spatial inhomogeneity spectrum of the scattering plasma were estimated. The characteristic frequency and time scales of the diffractive scintillations for PSR B0809+74 are comparable to the receiver bandwidth and observation time, respectively. Therefore, only a lower limit for n can be obtained for this pulsar. For PSR B1133+16, the mean value is n = 3.40 ± 0.11, and n = 3.90 ± 0.04 for PSR B0919+06. We have also measured the angular diameter of the average scattering disks, θH , for these two pulsars. For PSR B0919+06, θH = 26 – 28 mas, and for B1133+16, θH = 12.0 ± 1.6 mas. We provide the estimates of the distance to the scattering screens. All measured parameters have been compared with previously published data.

About the authors

E. N. Fadeev

P. N. Lebedev Physical Institute of RAS

Author for correspondence.
Email: fadeev@asc.rssi.ru

Astro-Space Center

Russian Federation, Moscow

A. S. Andrianov

P. N. Lebedev Physical Institute of RAS

Email: fadeev@asc.rssi.ru

Astro-Space Center

Russian Federation, Moscow

M. S. Burgin

P. N. Lebedev Physical Institute of RAS

Email: fadeev@asc.rssi.ru

Astro-Space Center

Russian Federation, Moscow

M. V. Popov

P. N. Lebedev Physical Institute of RAS

Email: fadeev@asc.rssi.ru

Astro-Space Center

Russian Federation, Moscow

A. G. Rudnitskiy

P. N. Lebedev Physical Institute of RAS

Email: fadeev@asc.rssi.ru

Astro-Space Center

Russian Federation, Moscow

T. V. Smirnova

P. N. Lebedev Physical Institute of RAS

Email: fadeev@asc.rssi.ru

Puschino Radio Astronomical Observatory of the Astro-Space Center

Russian Federation, Puschino

V. A. Soglasnov

P. N. Lebedev Physical Institute of RAS

Email: fadeev@asc.rssi.ru

Astro-Space Center

Russian Federation, Moscow

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