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Table:
CLASS header parameters used to describe the
frequency/velocity axes and their translation in this document.
CLASS name |
Unit |
Translation |
Notation |
nchan |
-- |
Number of channel |
-- |
rchan |
-- |
Reference channel |
 |
restf |
MHz |
Tuned signal rest frequency |
 |
image |
MHz |
Tuned image rest frequency |
 |
fres |
MHz |
Observatory channel spacing |
 |
vres |
 |
Velocity channel spacing |
 |
voff |
 |
source systemic velocity |
 |
doppler |
-- |
Doppler factor |
 |
Table
describes the CLASS header parameters used to
describe the frequency/velocity axes and their translation in this
document. The signal and image frequency axis are given in the source (rest) frame
by
 |
(35) |
and
 |
(36) |
with
 |
(37) |
where
is the frequency channel spacing , and
is the source systemic velocity in the measurement frame. The
corresponding velocity axis in the measurement frame is thus given by
 |
(38) |
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2023-06-01