Spectral Line NGC660 Hydrogen Absorption
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NGC660 is a nearby starburst galaxy with hydrogen absorption against a nuclear outburst observed in 2013 (see Argo+2015.pdf). It was observed using the EVN.
The guide starts with a data set which has already been flagged and calibrated using the instrumental corrections and calibration derived from astrophysical sources including phase referencing. This was done in AIPS and the split-out, calibrated data NGC660.FITS are in UVFITS format.
Before starting please make sure that you have all data products below:
DARA students, you should have these on your computers already!
- NGC660.FITS UVfits data set with instrumental and calibration source corrections applied - needed to run from start of this script.
- NGC660shift.ms.tgz data set for starting at step 8 (you make this yourself if working through steps 1-7).
- NGC660_line.clean.image.tgz and NGC660_contap1.clean.image.tgz images for analysis (you make these yourself, but just in case…)
- NGC660.py script covering the steps in this web page
- NGC660.flagcmd flags for step 2
If not, then use the links to download them.
The bulky files can be downloaded by copying these commands into your Linux terminal: wget -c http://almanas.jb.man.ac.uk/DARA/NGC660/NGC660.FITS wget -c http://almanas.jb.man.ac.uk/DARA/NGC660/NGC660shift.ms.tgz wget -c http://almanas.jb.man.ac.uk/DARA/NGC660/NGC660_line.clean.image.tgz wget -c http://almanas.jb.man.ac.uk/DARA/NGC660/NGC660_contap1.clean.image.tgz
If you have all the files listed above, then please go to the guide to continue.