Ampl, Phase vs (u,v) Distance

The horizontal axis is the (u,v) distance: sqrt (u² + v²), and the vertical axis is the amplitude and the phase of the correlation output, whose units are Jy/beam (intensity per synthesized beam), and degree, respectively. This figure indicate the size of the observing source. If the source is a point-like structure, the amplitude will be constant with respect to the (u,v) distance. Green shows the data from the interferometry (visibility) data, and red shows the visibility data calculated from the constructed image.

Ampl, Phase vs Time

Plot of variation of phase and amplitude data of visibility data for each baseline. Green shows the visibility data, and blue shows the visibility data calculated from the constructed image.

(u,v) Coverage

Distribution of sampling points of spatial frequency components ((u,v) components) when viewed from the observing source (observing phase center). It is a good observation that the (u,v) components are sampled uniformly, but if the structure of the source is simple, image of the source can be obtained even if the sampling is sparse. The unit is Mă on both the vertical and horizontal axes. ă is a observing wavelength, which indicates how many million times of the observed wavelength.

Closure Phase vs Time

Time variation of closure phase in degree. Closure phase is calculated from phases of visibility data from 3 baselines. (i.e. phase (1-2) + phase (2-3 ) + phase (3-1)). This values are free from all antenna based effects (such as antenna clock error, atomospheric effect, etc), and non-antenna based values (information) including the structure of the observing target, are included in closure phase.

Clean Image

Image of the observing source. The units of the horizontal axis and vertical axis are milli arc seconds. The ellipse on the lower left shows the size of the half maximum of the synthesized beam. When the long axis direction of this ellipse is long, it indicates that the resolution of observation in that direction is poor.

Ampl, Phase vs (u,v) Distance

Same plot as we see above in "Image".

Ampl, Phase vs Time

Same plot as we see above in "Image".

(u,v) Coverage

Same plot as we see above in "Image".

Closure Phase vs Time

Same plot as we see above in "Image".

Image with model components

Image generated by multiple Gaussian components. Decide parameters of Gaussians with fitting interferometry (Visibility) data. Other explanations are same as above in "Image".