MOPEX User's Guide - IRSA

PURPOSE
MOPEX User’s Guide
This module provides a different kind of detection table than the Detect. It includes shape
information about the detections, but it does not record the blends, so in general it cannot
replace Detect. It also produces a mask image (pixe l va lue = 1 on the detections). This can
be used to mask the brightest detections before running Detect.
INPUT
Same as for the Detect module (see next section, §6.5.12).
COMMAND LINE INPUT
See the Detect module
OUTPUT
Table (*_detect_bright.tbl): a detection list with shape information.
FITS file (*_detect_bright_mask.fits): a mask image showing the segmentation level of
detected clusters.
For APEX Multiframe, the output files are written to the Coadd-apex/ subdirectory.
DISCUSSION
The bright detect list created by this module provides information about the shapes of the
detections. The shape parameters are mostly clear from the column names. The shape
parameter Linearity is 0.25 * (Perimeter length) / sqrt (No. pixels). Below is an example of
the detection table:
\char comment = Output from DETECT, version 4.00
\char Date-Time = Wed Feb 4 12:12:34 2004
\char comment = dlimage library version 2.00
\char FITS_In_Filename = Coadd-apex/coadd_Tile_001_Image_minback.fits
\char FITS_Out_Filename = Coadd-apex/coadd_Tile_001_Image_detect_bright_mask.fits
\char Sigma_In_Filename = Coadd-apex/coadd_Tile_001_Unc.fits
\char Bright_Table_Out_Filename = Coadd-apex/coadd_Tile_001_Image_detect_bright.tbl
\float Tile_OffsetX = 0
Point Source Extraction (APEX) 132
APEX Modules