M31 Radio Map Green Bank 20m RT 13/03/25

My first “map” of M31 – results of my first observing programme using the
20m dish at Green Bank Observatory. The spectra show a clear change in
Doppler shift with increasing RA, and with increasing declination,
reflecting the rotation of the galaxy. Also, the side that the peak is
shifted from 1420MHz demonstrates that M31 as a whole is moving towards us.
Andy