MOPEX User's Guide - IRSA

PURPOSE
MOPEX User’s Guide
Fits the input image with the PRF to estimate fluxes and refine positions of the point-source
candidates from the detection list.
INPUT
NOTE: The inputs marked with a * are the ones users will be most likely to adjust.
Input Type: Image List for APEX Single Frame and APEX User List Single Frame; Tile
Map for APEX Multiframe; Detection Map for APEX User List Multiframe.
*Fitting Area X,Y: (int) Size of the area in the input image to be fit with the PRF, in input
image pixels. If not given, the detection table is expected to have FitX and FitY columns,
whose content is used for the same purpose. These columns are produced by the Fit Radius
module. If these columns are present, and Fitting Area X,Y are set then the latter takes
precedence.
Max Numbe r ps: (int) Maximum number of point sources to use in an attempt to deblend a
detection (active de-blending). If Max Number ps > 1, the module will attempt to do an
“active” deblend of the detections that were unsuccessfully fit. This should be used only with
extreme caution.
*Chi Threshold: (float) Maximum acceptable value of χ 2 / dof (degrees of freedom).
N Edge: (int) Positive number excludes point sources within N Edge pixels of the edge of the
input image from fitting. A negative number appends an edge around the input images
N_Edge pixels wide to include the point sources into the fitting. In APEX User List
Multiframe, N Edge should match the parameter of the same name in the Detection Map
module.
Max N Iteration: (int) Termination criterion for the maximum number of iterations to reach
Chi Threshold.
Max N Success Iteration: (int) Termination criterion for the maximum number of iterations
after Chi Threshold has been reached.
Minimize Ftol: (float) Termination criterion for the relative change in χ 2 / dof to achieve
before Chi Threshold is reached.
Point Source Extraction (APEX) 147
APEX Modules