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Interpreting the spectral axis
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IRAM Memo 2011-4 Handling
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IRAM Memo 2011-4 Handling
Contents
Interpreting the spectral axis throught the Doppler effect
Natural expression of the spectral axis in radio-astronomy
Various approximations of the Doppler effect
Interpreting the spectral axis in the local universe
Interpreting the spectral axis at high redshift
Validity of the radio velocity convention
Handling the local and high redshift universe with the same formalism
Using the radio velocity convention
Using the special relativity formula
Heterodyne receivers and signal/image frequency axes
USB and LSB frequency axes in the observatory frame
Signal and image frequency axes in the observatory frame
Signal and image frequency axes in the rest frame
Earth movements
Periodic shift and dilatation of the rest frequency axis
Stopping the periodic shift
Stopping the periodic dilatation
CLASS implementation
The header parameters
The MODIFY FREQUENCY command
The MODIFY VELOCITY command
The MODIFY REDSHIFT command
The CONSISTENCY command
The situation at the IRAM-30m
Velocity conventions
Systemic velocity in different frames
Conclusions
Bibliography
Gildas manager 2015-03-01