Revealing compact structures of interstellar plasma in the Galaxy with RadioAstron

Abstract

The aim of our work was to study the spatial structure of inhomogeneities of interstellar plasma in the directions of five pulsars: B0823+26, B0834+06, B1237+25, B1929+10, and B2016+28. Observations of these pulsars were made with RadioAstron space-ground radio interferometer at 324 MHz. We measured the angular size of the scattering disks to be in range between 0.63 and 3.2 mas. We determined the position of scattering screens on the line of sight. Independent estimates of the distances to the screens were made from the curvature of parabolic arcs revealed in the secondary spectra of four pulsars. The model of uniform distribution of inhomogeneities on the line of sight is not suitable. According to the results, we came to the conclusion that scattering is mainly produced by compact plasma layers and the uniform model of inhomogeneties distribution on the line of sight in not applicable.

arXiv comment15 pages, 12 figures

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• Pulsar scintillation studies with LOFAR. I. The census
• Noodle Model for Scintillation Arcs
• The Thousand-Pulsar-Array programme on MeerKAT -- X. Scintillation arcs of 107 pulsars
• The $\theta$-$\theta$ Diagram: Transforming pulsar scintillation spectra to coordinates on highly anisotropic interstellar scattering screens
• Discovery and modelling of broad-scale plasma lensing in black-widow pulsar J2051$-$0827
• Disentangling interstellar plasma screens with pulsar VLBI: Combining auto- and cross-correlations
• Interstellar scintillation and polarization of PSR B0656+14 in the Monogem Ring
• Substructure of visibility functions from scattered radio emission of pulsars through space VLBI
• Electron density variations in the interstellar medium and the average frequency profile of a scintle from pulsar scintillation spectra
• Study of the variability and components of the pulsar B0823+26 at a frequency of 111 MHz