1D Aperture Setup

Illustrations of the available 1D aperture setups using the aperture_classes module. The apertures setup chosen should be identical to how user extract the 1D profile from the data cube.

Circular Aperture

Keywords controlling the aperture shape: slit_pa, slit_width, aperture_radius.

This setup consists of circular apertures with a radius specified by aperture_radius. The apertures are positioned along the slit, which is defined by the parameters slit_pa and slit_width. The angle slit_pa is the position angle in degrees from North pointing towards the blue side. In general, slit_width would be the FWHM of the beam size. If aperture_radius is not set, the user must provide a value for slit_width.

../_images/circ_cp.png

The aperture centers (the red dots) aper_center are specified via rarr (in unit of arcsecond) as an array in the first column of the input file for fdata.

Rectangular Aperture

Keywords controlling the aperture shape: slit_pa, slit_width, or alternatively, specify pix_perp and pix_parallel.

This setup consists of a series of rectangular apertures lies along the slit_pa. The dimensions of the rectangles are controlled by either the parameters : slit_width or by directly specifying pix_perp and pix_parallel. These dimensions are illustrated below.

../_images/rect_cp.png

The user has the flexibility to define arrays for pix_perp and pix_parallel. The arrays should match the length of the aperture centers specified in rarr (in unit of arcsecond) in the input file for fdata.

Single Pixel PV

This configuration is equivalent to a Rectangular Aperture when pix_parallel is set to 1.