Laurel Carpenter Research Journal (Summer '22)

07/05-07/08

• test with 5hr on-source observation whether using "normalization" keyword in xml model generation gives different result than "prefactor" keyword
  • up to this point, have used prefactor keyword
  • as hoped, results are the same whether "normalization" or "prefactor" is used

06/27-07/01

• new attempt at generating xml models for 50hr on-source observations for gas map, goes much faster now
• master comparison of spectral params for 50hr on-source observations (xmm radial shell, xmm model, and gas model)
  • to do: generate maps/models for gas radial shell
  • add offset=3deg observations to comparison

• tutorial for how to crop fits file in astropy (ds9 does not allow you to save a cropped image):
  • https://docs.astropy.org/en/stable/nddata/utils.html#saving-a-2d-cutout-to-a-fits-file-with-an-updated-wcs
  • instead of downloading fits file, open with fits.open: https://docs.astropy.org/en/stable/io/fits/index.html#opening-a-fits-file
  • I wrote jupyter notebook that does this, for others to copy and use:

    • /nevis/milne/files/lc3471/data/CTA/Simulations/out/crop_fits.ipynb

• takes a really long time to generate xml models and fits for 50hr observation using gas template
  • probably because the image used for gas template is much larger than the x-ray image we were using previously
  • the FOV of this image is much larger than the actual source, find a way to crop image to same dimensions as x-ray image

06/21-06/24

• look at skymaps/residuals using Massimo's jupyter notebook as opposed to editing in ds9 (faster, easier, looks better)
• radial shell is not best fit, gaussian fit does not converge (as expected), now use x-ray image as map
  • results are much better than radial shell (expected)
  • generate observations for offset=3deg (so far we have only done on-source)
  • create TS map
• jupyter notebook to easily read out params from xml file:

  • /nevis/milne/files/lc3471/data/CTA/Simulations/out/read_xml.ipynb

06/13-06/17

• unable to save edited fits files from ds9 as png images
  • tried as jpeg, tiff, gif, etc as well
  • issue is that on some mac os, save image will not work if the ds9 window is not exactly positioned at (0,0) in the screen display
  • http://ds9.si.edu/doc/faq.html#MacOSX
• create circle or annulus region in ds9 (showing radial shell fit):
  • http://ds9.si.edu/doc/ref/region.html
  • use radius/width params from radial shell xml file

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