Brief description
Use data from the Leiden/Dwingeloo radio survey of neutral hydrogen
in the Galaxy to determine the spiral arm structure of the Milky
Way. By assuming that Galactic material moves in circular orbits
at angular speeds that depend only their orbital radius (distance
to the Galactic Centre), you can interpret redshifts in any directions
as a distance along the line of sight. Peculiar motions within the
Galaxy can also be determined.
Several nearby galaxies were seen for the first time in these data,
previously hidden behind the dust of the Galactic plane. See if
you can spot them (hint: tey will appear as material with an anomalous
velocity).
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