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class-spectral-axis-v12
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class-spectral-axis-v12
Contents
Introduction
Spectrometers in radio-astronomy
The Doppler effect
Interpretation 1: At fixed
Interpretation 2: At fixed
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 IRAM-30m case as of 2019-07-06: Systemic velocity in (slightly) different frames
The MODIFY FREQUENCY command
The MODIFY VELOCITY command
Velocity conventions
The generic Doppler formula
The radio velocity convention
The optical velocity convention
Mixing conventions between observation and analysis
Bibliography
Gildas manager 2023-06-01