When running APEX User List and APEX User List Single Frame, the user is required to enter a table listing the point sources that APEX should extract. This replaces the running of the Detect module. For more information on APEX User List, see Chapter 6. This table is given in the APEX User List Settings module as User Input Fixed Positions Table File Name, or in the command-line namelist as INPUT_USER_LIST.
There are several ways to create this table:
Provide a text file with a list of RA and Dec coordinates, with exactly the following format:
|RA |Dec |
|double |double |
274.072341 -2.544706
274.072895 -2.531989
Edit a previously-generated source table that was output by the Detect module, to include only those sources that you wish to extract. Note that in this case, you may find it easier to simply run APEX with Select Detect, rather than running APEX User List;
If you are running APEX User List Single Frame then you can use the GUI to interactively select the sources that you wish to extract. Start by selecting an input file in the Initial Setup module, open the APEX User List single frame Settings. You have the choice to either input an existing User List file, or Create User Input List. Click on the Create User Input List button, and MOPEX will bring up your input mosaic in a separate window, alongside a User Input List control window. Left-clicking on a source in the image window will add its position to the control window. Ctrl-Left click on a previously-added point source to select it without adding a second source at the same position. Shift-Left click on a source to center the image at that point. If you wish to delete a source from the input table, select it in the control window and click the “Delete Selected” button. Note that selecting a source is not the same as checking the box to the left. The checkbox simply controls whether the source is shown in the image window or not. You can also delete all sources except the ones you have selected by using the “Keep Selected” button.
Once you have finished selecting your sources, press the “Save Table” button, give the file a sensible name, and then click “Save”. Click “Done” to return to the APEX User List single frame Settings window. Finally, load your newly-saved table into the User Input Fixed Positions Table File Name.
