May be used to display the average pixel values within a wedge shaped
sector/slice of the image. The sector is in the form of a wedge (of user defined size) drawn outward
from the galaxy origin point.
The results are displayed as mean pixel value (in terms of level relative to sky or surface brightness)
versus distance from the galaxy origin. Pixel count values are summed over all the pixels at a given
distance from the origin.
summing pixels taken from two equal sized, but diametrically opposite, sectors.
displaying data using a number of possible radius transformations.
the use of a graphics cursor to select the image object to be examined.
refinement of approximate galaxy centre positions if required.
automatic selection of the maximum radius out from the origin to be considered.
The application is not intended to replace ELLPRO or ELLFOU profiling application, but merely to
allow the user to obtain quickly a first approximation to the brightness cross-section of an interactively
SECTOR CURSOR ARDFIL BACK SIGMA PSIZE SURF RADISP MIRROR
ZEROP OUT [IN] [DEVICE] [IMGDEV] [FITLIM] [POSANG]
[ANGWID] [RLIM] [SAME] [AGAIN] [ORIGIN] (COLOUR)
Should another profile be attempted?
ANGWID = _REAL (Read)
width of the slice/wedge/sector to be considered. Units degrees.
ARDFIL = _CHAR (Read)
name of an ARD file to be used to mask out regions of the image that are not to be used.
AUTOL = _LOGICAL
Is a simple method to be applied to get a better estimate of the
galaxy centre position? The accuracy of the method used is no better than 1 pixel.
The background value for the image. Units counts.
COLOUR = _INTEGER
Colour used when showing the galaxy centre and profiling radius.
Whether the galaxy location is to be identified using the graphics
cursor or the keyboard.
DEVICE = _DEVICE (Read)
The name of the display device on
which the results graphs should be displayed.
FITLIM = _REAL (Read)
The range of
radius values over which the scale length ’fits’ are to be calculated. Units arc seconds.
IMGDEV = _DEVICE (Read)
Name of the graphics device displaying the image.
IN = _NDF
The name of the source NDF data structure/file.
MIRROR = _LOGICAL (Read)
Whether the summation is to be taken from two sectors/wedges/slices of the same size, but
on diametrically opposite sides of the galaxy origin.
ORIGIN = _CHAR (Read)
indices for the origin point to be used. Given in the Current coordinate system of the WCS
component of IN.
PORIGIN = _CHAR (Read)
Image indices for the origin point to be
used, in pixel units. This parameter is present to aid the interface with the GAIA system.
It should be regarded as an ‘internal’ parameter, and may disappear or change without
notice. If present, the value of this parameter overrides any value specified by the ORIGIN
OUT = _CHAR (Read)
File name for the output text file containing the profile
POSANG = _REAL (Read)
The position angle of the sector relative to the top
of the image. Convention is clockwise increases angle and the image Y axis represents 0
degrees. Units degrees.
PSIZE = _REAL (Read)
The size of each pixel in arc seconds. If
the image contains a SKY co-ordinate frame this value will be determined automatically.
RADISP = _CHAR (Read)
The display mode used for the radius axis of the graphs.
RLIM = _INTEGER (Read)
Distance out from the origin at which the sector stops. Values
are input as arc seconds, but the program works in pixels. A value of 0 causes the application to
automatically select the distance at which to stop.
SAME = _LOGICAL (Read)
graphs be displayed on the same device as the original image?
SIGMA = _REAL (Read)
The standard deviation of the background value. Units counts.
SURF = _LOGICAL
Are the pixel values to be expressed as surface brightness. If true then the output
is surface brightness, otherwise the display shows brightness in terms of sigma above
sky. i.e. (I-Back)/SIGMA
ZEROP = _REAL (Read)
Zero point of the scale for surface
brightness plots. Units magnitudes per square arc second.