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.
Options include:
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 selected galaxy.
Profiles an object identified on the currently displayed image using a cursor/mouse. The resulting profile is displayed as linear radius versus surface brightness. ARD file ARDUP is used to identify parts of the image that may not be used. The source image is currently displayed on device XWINDOW and the graphs will appear on device X2WINDOW. The galaxy centre co-ordinate identified is refined automatically. The radius limits to be employed when calculating scale length are defined using the cursor/mouse.
An object located at the co-ordinates indicated on image IC3374 is profiled in the 25 degree direction out to a distance of 25 arc seconds. The Current co-ordinate frame of IC3374 is in the SKY domain. The pixel size in arcseconds is determined automatically from the SKY coordinate frame. The wedge/sector used will be 5 degrees wide and the scale length will be calculated using data obtained in the radius range 0-20 arc seconds. The user supplied estimate of the galaxy centre will not be refined. Output is to the text file ic3374.pro. The graphs generated will be quarter power radius versus surface brightness.
ESP --- Extended Surface Photometry