FEPS Pleiades Star HII_173: MIPS-PHOT, band 2, 70 micron

Requirements:

• SOFTWARE SETUP: Follow the basic instructions on Imaging: Mosaicking to get the software set up.
• DATA DOWNLOAD: Follow the instructions in Download Data using Leopard: FEPS Pleiades Star HII_173 to retrieve the data.
• ESTIMATED TIME: This should only take a few seconds to a few minutes on your computer.

Outline of the demo:

In this demo, we mosaic small-field 70 um photometry observations. This demo continues in a source extraction step.

To follow all of the examples using these data, going from retrieving data using Leopard through extracting point-source fluxes, see this page.

You will need to run these scripts:

• mosaic.pl

You will need to use these namelists:

• mosaic_70um.nl

Step by Step Guide

1. The online (=automatically produced) 70 micron mosaics may not be good enough to start analysing for science right away, but they are good enough to quickly assess your data - did you see something bright or not? For an initial look at your data, use ds9 or your favorite image viewer to examine the on-line mosaics that came with your data.

   unix% cd /where/you/unpacked_data/r5315584/ch2/pbcd/ unix% ds9 SPITZER_M2_5315584_0002_1_E414063_msaic.fits &

   Note that, unlike for 24 micron, no "non-prime" data here. However, under S11, there are two mosaics - filtered and unfiltered. As of this writing, the best data available for this star is still S10 data, so there is only one - nonfiltered - mosaic.) No source is apparent at the center, but off-center, there seems to be one. (For completeness, we note that there are no 160 um mosaics at all, because this array was never "prime," so all of these data are ancillary.

2. Set up things to run, part 1. Personally, I like to have just one copy of the cal directory into which I can put the latest pmasks and the PRF I want to start from. Also copy the cdf namelist files for this example into a cdf subdirectory.

   unix% cd r5315584/ch1/bcd/ unix% ln -s /where/you/unpacked_data/cal ./cal unix% mkdir cdf unix% mv /where/you/downloaded/mosaic_70um.nl ./cdf/

3. Set up things to run, part 2.

   unix% cd r5315584/ch2/bcd/ unix% ls *_bcd.fits > InputImageList.txt unix% ls *bmask.fits > DmaskList.txt unix% ls *bunc.fits > SigmaList.txt unix% wc *.txt unix% nedit cdf/mosaic_70um.nl

   These files are needed as input to the mosaic.pl script. These lists will contain all of the bcds, masks, and uncertainty files.

   Here you don't need to worry about serendipitous data or the first frame effect. You might want to check the length of each file (wc *.txt) to be sure that each list has the same number of files. If you find that that file has a lot more lines than the others, the following is probably what happened. Because the filtered and unfiltered BCDs have similar filename extensions, be sure that you are only putting the unfiltered (or just the filtered) into the InputImageList.txt file.

   Edit the namelist to reflect where your cal files are located -- be sure to use absolute pathnames!

4. Make the mosaic!

   unix% mosaic.pl -n mosaic_70um.nl OR unix% mkdir pbcd70 unix% mosaic.pl -n mosaic_70um.nl > pbcd70/mosaic.log

   Note that the namelist is assumed to be in the cdf subdir, not in your current directory. If desired, redirect the output to a log file for your records. (actual mosaic log file)

   Common errors:

   • "mosaic.pl: Command not found." means you have not sourced the csh when setting up the mopex package in your current shell (window).
   • other "files not found" -- make sure you set all the paths correctly in the namelist, and that you're sitting in the correct directory when you call mosaic.pl.

5. Check the mosaic.

   unix% ds9 pbcd70/Combine/mosaic.fits &

   Check the mosaic for anything that looks 'odd.' It should look similar to the online unfiltered mosaic (which came with your data, in the pbcd directory). (see figure and fits file)

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