Preliminary results of giant pulse investigations from Crab pulsar with Radioastron
Alexey Rudnitskiy, Mikhail Popov, Vladimir Soglasnov
TL;DR
This study presents initial findings from observing giant pulses from the Crab pulsar using Radioastron and other VLBI stations, focusing on scattering effects in the interstellar medium and estimating related parameters.
Contribution
It provides new measurements of scattering screen distance, angular size, and scattering time using space-ground VLBI observations of Crab pulsar giant pulses.
Findings
Estimated distance to scattering screen
Measured angular size of scattering disk
Detected shape changes in cross-correlation functions
Abstract
Giant pulses from Crab pulsar were observed together with Radioastron space radiotelescope, Global EVN radio telescopes and Kvazar-KVO VLBI stations to study the scattering effects in the ISM. Five observing sessions were conducted at 18 cm (EVN codes: EG060A, EG060B, EG067B, EG075) and one at 92 cm (EVN code: GS033A). We have estimated distance to the scattering screen, angular size of scattering disk, scattering time. All estimations were done in an assumption of single thin scattering screen. Also, a significant change in the shape of cross-correlation functions for space-ground baselines was found (starting from 4 up to 12 Earth diameters).
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