English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The high brightness temperatures, $T_\mathrm{b}\gtrsim 10^{13}$ K, detectedin several active galactic nuclei by RadioAstron space VLBI observationschallenge theoretical limits. Refractive scattering by the interstellar mediummay affect such measurements. We quantify the scattering properties and thesub-mas scale source parameters for the quasar B0529+483. Using RadioAstroncorrelated flux density measurements at 1.7, 4.8, and 22 GHz on projectedbaselines up to 240,000 km we find two characteristic angular scales in thequasar core, about 100 $\mu$as and 10 $\mu$as. Some indications of scatteringsubstructure are found. Very high brightness temperatures, $T_\mathrm{b}\geq10^{13}$ K, are estimated at 4.8 GHz and 22 GHz even taking into account therefractive scattering. Our findings suggest a clear dominance of the particleenergy density over the magnetic field energy density in the core of thisquasar.

The high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering