MEASUREMENT OF RADIO EMISSION SCATTERING PARAMETERS AT THE FREQUENCY 1650 MHz IN THE DIRECTION OF PULSAR B1937+21 WITH GROUND-SPACE INTERFEROMETER RADIOASTRON

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Abstract

As part of the Early Science Program of the RadioAstron project, the millisecond pulsar B1937+21 was observed in October 2012. The total duration of the experiment supported by eight ground-based radio telescopes was about three hours. The radiation in both circular polarizations in the frequency band of 1644–1676 MHz was recorded. Characteristic time and frequency scales of scintillation caused by the scattering on the interstellar plasma density fluctuations were measured: Δdiff = 275.2 ± 0.1 s and ΔV diff = 580 ± 30 kHz. The angular diameter of the scattering disk, θH = 0.32 ± 0.03 mas, have been estimated from the drop-off of the amplitude of the interferometric response at the ground-space baselines. The dependence of the visibility amplitude on the delay shows two scattering time scales: τsc1 = 110 ± 30 ns and τsc2 = 750 ± 100 ns, which indicates an ellipse-like scattering disc with an axis ratio of 2.6:1. The drift of the visibility maximum on the residual interference frequency that was observed at the intercontinental baselines can be explained by atmospheric effects, the dominant contribution being the additional phase shift in the troposphere above European stations.

About the authors

E. N Fadeev

Astrospace Center of P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Email: fadeev@asc.rssi.ru
Moscow, Russia

M. S Burgin

Astrospace Center of P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Moscow, Russia

M. V Popov

Astrospace Center of P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Moscow, Russia

A. G Rudnitskiy

Astrospace Center of P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Moscow, Russia

T. V Smirnova

Puschino Radio Astronomical Observatory of the Astrospace Center of P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Pushchino, Russia

V. A Soglasnov

Astrospace Center of P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Moscow, Russia

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