MOPEX User's Guide - IRSA

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Appendix D. Some Tips for MOPEX with Spitzer Data: Version 1 (3/16/2012) D.1 Mosaics (IRAC and MIPS) Some Tips for MOPEX with Spitzer Data: Version 1 (3/16/2012) MOPEX User’s Guide The end result of a normal Mosaic run is mosaic files in output_dir/Combine-mosaic (Combine in command-line). Generally no weighting of the pixel stack is used, and especially no sigma weighting if sources are present. You can combine data with different exposure times and weight them by time if the FITS keyword that has the time in it is provided. For Spitzer data, this is 'EXPTIME'. It should be set in the GUI Mosaic Coadd Settings. (In command-line, put INTEG_TIME_KWD = 'EXPTIME', in the Coadd block of the namelist.nl file.) The coverage mosaic is always the number of good pixels in the final stack. The total exposure time for a pixel (when time-weighting) is not available as a mosaic, but can be found per tile in the output_dir/Coadd-mosaic directory. (If there's only one tile, it is like the final mosaic.) D.2 Fluxes and Uncertainties (IRAC and MIPS) The end result of a normal point-source fitting run (Apex or Apex 1frame) is a table in the Output directory called *extract.tbl. It's in IPAC table format, readable by many common tools. A tool for reading an IPAC table into an IDL structure is available at http://irsa.ipac.caltech.edu/tools/irsa_idl.html. The point-source fitted fluxes (in microJy for Spitzer data) are in the "flux" column. For the uncertainty, use the signal-to-noise column called "SNR", i.e. uncertainty = flux/SNR (for a quick discussion, see the file in the Mopex directory readme/README_new_snr_option_081108.pdf). The aperture fluxes and uncertainties (in microJy) have obvious names in *extract.tbl. (If you ran only aperture photometry, they are in aperture.tbl.) There are some small correction factors needed for the highest accuracy. Aperture corrections for apertures other than the standard calibration aperture and annnulus can be found in the IRAC and MIPS Data Handbboks. Some corrections for PSF-fitted fluxes can be found in Appendix C. 250 D.1 Mosaics (IRAC and MIPS)
Some Tips for MOPEX with Spitzer Data: Version 1 (3/16/2012) MOPEX User’s Guide IRAC array location-dependent corrections with MOPEX are discussed in Spitzer Data Analysis Cookbook: Recipes 6 and 7. Color corrections are in the IRAC and MIPS Data Handbooks. D.3 Point-Source Fitting: Apex for IRAC stacks, Apex_1frame for MIPS mosaic The point source response functions and sample namelists that come with MOPEX are for fitting on the (C)BCD frames for IRAC (Apex) and on the default mosaics for MIPS (Apex 1frame). D.4 Use the Mosaic Task to make Mosaics (IRAC data) Sounds obvious, but the confusion comes when running APEX (multiframe) on IRAC data. APEX is set up to make a mosaic from the image stack for point-source detection (and does so in the default templates and namelists, e.g. apex_I1_gui.nl). This is because APEX needs some files that are part of the mosaic process. But it can't do all the fancy outlier rejection that Mosaic can. For most data, it's better to make mosaics with the Mosaic task. One approach might be called "all at once". Set up a GUI Mosaic flow, then click on "Insert APEX multiframe..." and use one of the standard templates. Shut off (hit the X) APEX mosaic commands: Fiducial Image Frame, Mosaic Interpolate, Mosaic Coadd, and Mosaic Combine. This is described in the Spitzer Data Analysis Cookbook: Recipe 7. The GUI version of APEX will now be able to find the Mosaic files it needs. Start the combined flow with the green arrow at the top. What if you made a nice mosaic last week and don't want to re-do it? Provided you saved the original output directory, you can just run APEX. Set the APEX output directory to the original output directory. You can use a standard template and turn off the APEX mosaic commands as above, or, for your convenience, there are example namelist files that do this for you, cdf/apex*have_mosaic*gui.nl. (In command-line, run mosaic.pl as usual, then drop the mosaicing tasks from your Apex namelist and run apex.pl to the same output directory used for mosaic.pl, or use one of the cdf/apex*have_mosaic*.nl namelists.) 251 D.3 Point-Source Fitting: Apex for IRAC stacks, Apex_1frame for MIPS mosaic
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MOPEX User’s Guide MOsaicking and
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MOPEX User’s Guide 7.4 PRF Estima
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Chapter 1. Introduction MOPEX User
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MOPEX User’s Guide • If you are
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for Linux and Solaris systems, and:
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Chapter 2. Overview of MOPEX MOPEX
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For instructions on how to run MOPE
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2.3.1 Additional Functionality MOPE
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MOPEX User’s Guide Choosing the r
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Chapter 3. MOPEX Input MOPEX User
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3.2 MOPEX Input List Files MOPEX Us
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Chapter 4. Overlap (overlap.pl) MOP
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MOPEX User’s Guide 3. Background
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ncpu_multiprocess = 1 default = 1 I
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4.3.3 Overlap Modules: S/N Estimato
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σ = σ 2 readnoise g 2 + σ 2 conf
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OUTPUT MOPEX User’s Guide Generat
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MOPEX User’s Guide more informati
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OUTPUT None DISCUSSION MOPEX User
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DISCUSSION No further information.
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PURPOSE MOPEX User’s Guide The in
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There are no user-defined input par
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COMMAND LINE INPUT See INPUT. OUTPU
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MOPEX User’s Guide Point Source D
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Figure 6.1: Overview of the main pr
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Relevant Pipelines: All PURPOSE INP
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NICE = 1 save_namelist = 1 MOPEX Us
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⎛ ⎜ ⎜ P( j) = ⎜ 1+ ⎜ ⎜
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MOPEX User’s Guide \float Tile_Of
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INPUT Columns selection: MOPEX User
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MOPEX User’s Guide given below. O
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6.5.19 APEX Modules: Aperture Photo
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PRF_ResampleX_Factor = 100, PRF_Res
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DISCUSSION MOPEX User’s Guide Wit
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T cl = P min − T min SegLevel MOP
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