XVista manual page

NAME

profile - to make a radial profile of an object.

SYNOPSIS

profile image [axr=] [axc=] [radius=] [outfile=] [eef]

DESCRIPTION

This program computes the energy distribution as a function of distance from the center of the star. For every pixel within a distance radius of the given centroid, this routine prints the distance of the pixel from the centroid and its value. The resulting two-column list is sent to standard output, or to the file named in the command line.

If axr is specified, use this as the center row coordinate of the object. Otherwise the XVista variable axr is used (if it exists).

Ditto for axc, the column coordinate.

Unless radius is specified, the profile is calculated to a distance of five pixels from the centroid.

Use outfile send output to a file instead of the standard output; redirecting the standard output via UNIX also works.

The eef option takes the resulting profile, sorts it by distance from the center and prints out the encircle energy function and the average value at increments of 1.0 in distance from the central spot.

OUTPUT

The output of this command is a series of lines with the format:

3.47 456

where the first number is the total distance of a pixel from the centroid, and the second is the number of counts in the pixel. Note: The output is not sorted in any particularly nice order.

EXAMPLE

profile ngc7790 axr=35.65 axc=124.55

Creates a list of lines in the above format for all pixels within a radius of 5 pixels of (35.65, 124.55), and sends them to the standard output.

SYMBOLS