Free Access

Fig. 5


Sketches of the natural weighting of the synthesized wide-field visibilities. Each measured spatial frequency will produce wide-field spatial frequencies apodized by the transfer function () centered on the measured spatial frequency. The used transfer function depends on the telescopes used, explaining why wide-synthesis naturally handles the short spacing either from a single-dish antenna or from a heterogeneous array. The synthesized visibilities in the overlapping regions will then be averaged. Two textbook examples are illustrated: 1) the combination of data from the IRAM-30 m single-dish (red transfer function) and from the Plateau de Bure Interferometer (black transfer functions) at the top; and 2) the combination of data from ALMA 12 m-antennas used either in single-dish mode (red transfer function), in interferometric mode (black transfer functions) and of data from the ACA 7 m-antennas (blue transfer functions) at the bottom. The minimum uv distances measured by each interferometer were set from the minimum possible distance between antennas (24 m for PdBI, 15 m for ALMA and 9 m for ACA).

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.