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The Doppler effect is used to interpret the frequency axis of the measured
spectrum. Using the radio convention, the non-relativistic Doppler effect
in the observatory frame can be written as
 |
(2) |
where
is the velocity of the source in the observatory frame,
and
are the frequency of the measured photon in the
observatory and rest frame respectively.
is positive if the source
recesses and the rest frame is defined as the frame where the velocity of
the emitting gas cell is zero. Introducing the doppler parameter
, we obtain
 |
(3) |
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2023-06-01