Free Access

Fig. 1


Coverage of the Fourier domain (uv coverage) of the RadioAstron observation of 0642+449 at 1.6 GHz (λ = 18 cm), plotted in units of Mλ. The central part corresponds to the perigee imaging segment (GK047A) and the short segment at v ≈ 400 Mλ represents the long-baseline tracking segment (GK047C). Color marks the upper limit of brightness temperature obtained from visibility amplitudes (for details, see discussion in Sect. 4.1).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.