![]() ![]() If any of the contributing BCDs are stim flash files then you should make a note of them so you can remove them from the GeRT input lists in the next step. Compare this list of contributing BCDs to the list of stim flash files that you made above. This will bring up a dialogue box listing all of the BCDs that contributed to the pixel that you clicked on. Once you have zoomed in on the galaxy, you should click on the image somewhere over the galaxy. We are trying to identify the stim flashes that have been taken on top of the bright galaxy, so zoom in on that region of the mosaic using the zoom function on the left hand toolbar. Click "Yes" to overlay the BCDs on the mosaicked image. This will bring up the combined mosaic image and ask you whether you'd like to see the BCD outlines. Once the mosaicking process has finished, click on "View" next to "Mosaic Image File". ![]() Click "OK" and then start the Mosaic flow by clicking on the green arrow in the top right corner of the MOPEX window. The Pmask FITS File should be set to the MIPS 70 microns PMask file found in the cal/ directory of your MOPEX distribution ( cal/mips70_pmask.fits), but the other input files can be left blank. Again, be patient, as it takes a while for MOPEX to display the directory contents. Next you need to click on "Optional Input & Mask Files" and set the Sigma List File and the DCE Status Mask File to point to the lists of the *bunc.fits and *bmask.fits files, respectively. Be patient when trying to load the Image Stack File - the directory contains a lot of images, and it takes a while for MOPEX to load the directory contents into the file selection window. Set up the flow by setting the Image Stack File to point to the file listing the *bcd.fits files and choosing an Output Directory. Start the MOPEX GUI and load the template mosaic flow for MIPS 70 microns data (go to File > New Mosaic Pipeline > Mosaic, MIPS 70 microns and hit "ok"). 29.3 Mosaic the BCDs to identify the bad stim flash frames Saoimage ds9 download download#You can download this as a FITS image here. Saoimage ds9 download how to#This cookbook addresses how to correct for this type of poor stim calibration by re-creating the BCDs from the raw files using the GeRT. This is due to a poorly calibrated stim response, caused by the stim flash being taken while the field of view was on top of the bright galaxy. The second issue is the "smearing" of the galaxy up the column on which it appears. This can be mitigated with careful re-filtering of the BCDs, and is explored in the next recipe, GeRT: Filter Extended Sources in MIPS-70 data. Firstly, the vertical striping across the detector. There are two immediately noticeable problems with this mosaic. The online (=automatically produced) 70 micron mosaics may not be good enough to start analyzing 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. Once you have downloaded the files to your disk, unzip them into a new working directory. You will need approximately 160 MB of space available to download and unpack the data. Saoimage ds9 download archive#Search the archive by AOR and download the post-BCD, BCD and raw data for the following dataset: AOR 5568512. The data should be retrieved from the Spitzer archive (see Recipe 1). You will need to download The GeRT ( ) in order to correct for bad stim flashes in your data. You will also need to download MOPEX ( ), in order to mosaic the individual data frames. You will need access to the Spitzer archive tool to download the example data set. For those users who are not interested in diffuse extended emission, such as the ISM, this recipe then continues in a filtering step. In this recipe, we use the GeRT to correct for a poor stimflash calibration in 70 microns photometry observations, before running MOPEX to create the final mosaic. GeRT: Bad Stim Flash Correction in MIPS-70 data ![]()
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