20.21 UV_RADIAL

[ADVANCED\]UV_RADIAL x0 y0 Rota Incli [/SAMPLING QSTEP [QMIN QMAX]] [/ZERO [Flux]]

Compute a UV table containing the radial distribution of the azimutal average of the visibilities after deprojection for inclination and orientation (Incli, Rota, in Degrees) around a specified center (x0,y0 in Radians). ROTA is here the position angle of axis of (assumed) rotational invariance of the object. Thus, when using results from UV_FIT one should use ROTA = PA-90, where PA is the Position Angle of the Major axis.

The result becomes the current UV table. The resulting UV table has a (u,v) coverage which is extended by rotation, so that it can be used to image the (rotationally symmetric) 2-D radial distribution using standard commands like UV_MAP and CLEAN. The radial profile of the brightness distribution can then be recovered by using any radial cut through this image.

Note, however, that in a SHOW UV command with "radius" along one axis, all visibilities at different azimut are superimposed. See UV_CIRCLE for a different way of computing an azimutal average, more suited for SHOW UV.