GDIGS-Low meeting

General

• First time meeting Pooja. We go around introducing ourselves.
• Status of the GBT proposals submitted in January: the special call proposal was accepted. Still no results from the regular call.

Cygnus X

• Riley will upload the products he has generated to the shared astrocloud folder.
• Kim goes over the procedure used to derive a continuum brightness map.
• Anish asks if we do not have continuum information from the GBT observations.
  • Pedro will look at the data and generate continuum maps.
  • We should estimate how accurate the continuum will be.
• Anish and Pooja were looking into using Planck along with RRL maps to estimate the free-free fraction.
• For carbon, the line-to-continuum ratio should be a direct measure of the line optical depth. Under the assumption that the emission is dominated by masering effects.
• For hydrogen, one needs the free-free emission only.
• Kim has been looking at CO line ratios to assess the optical depth. Is it fair to look the ratio smoothed to 36'?
• The cubes show structures that are smaller than the reported beam size in the headers. Why?
  • It seems the beam size is not reported properly in the headers.
  • Pedro will share the data for individual transitions with Anish.

Action items for the Cygnus X data

• Produce coverage cubes.
• Fix the beam information.
• Fix the frequency information.
• Decide on the best gridding parameters; What beam size to use?
• Can we generate continuum information from the GBT observations?