APEX_1frame Modules
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| Module | Description | Required Input | Output in output_apex_1frame directory |
|---|---|---|---|
| original 2mass image | *.fits | ||
| snestimator | estimates pixel uncertainty for each pixel in image | input image | *_sigma.fits |
| medfilter | performs background estimation of input images and outputs background subtracted images. This module is run twice, firstly for the purpose of point source detection (run_detect_medfilter) and again for point source fitting and extraction (run_extract_medfilter) | list of input images | *_minus_median.fits |
| gaussnoise | estimates the background fluctuations in the images (similar to medfilter) | list of input images | *_noise.fits |
| pointsourceprob | performs linear matched filtering and outputs point source probability images | output files from medfilter | *_PSP.fits |
| detect | performs image segmentation of point source probability images
(obtained from previous step)
define a "cluster" as a contiguous group of pixels |
output files from medfilter | *_detect.tbl (see module "fit_radius" for final format) |
| fit_radius | for each detection a search is performed in x and y directions
compares the values of the mean-subtracted input image and the corresponding uncertainty values finds the closest distance one has to go until the mean-subtracted image pixel values drop below the uncertainty level all the contents of the input table is copied into the output table with two more columns, FitX and FitY, added |
*_detect.tbl *_minus_median.fits |
*_detect.tbl (updated)
PRF_Map.tbl |
| sourcestimate | performs point source estimation
fits the input images with the PRF to estimate fluxes and refine positions of the point source candidates from the detection list if Max_Number_PS in sourcestimate namelist is set to anything but 1, the module will attempt to deblend the detections that can not be successfully fit |
*_detect.tbl *_noise.fits *_minus_median.fits PRF_Map.tbl |
*_extract_raw.tbl |
| aperture | calculates aperture photometry for each point source
the number of apertures is variable and both the number and the apertures are specified in the namelist |
*_extract_raw.tbl *_minus_median.fits |
*_aperture.tbl |
| select | creates the final table by applying user specified constraints and copying
user specified columns
The example showed here was created with: |
*_extract_raw.tbl | *_extract.tbl |
