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Multiple velocities and tuning solutions

In both Spectral Line and Single Continuum cases, it is possible to enter sources with different velocities. For Single Continuum, this is irrelevant as the setup is defined in the sky (topocentric) frame and thus the source velocities are ignored. For Spectral Line though, the velocities are crucial as these are used to convert the rest frequencies to their observed equivalents. In general, this means that each source requires its own tuning and its own set of calibration observations. This greatly increases the complexity and time required to complete a project and thus each Scheduling Block is restricted to five separate tunings.

The number of required tunings is calculated automatically by the OT in the following way:

The final number of tunings (sets) found by the algorithm is reported in the Time Estimate dialogue (Section 5.3.5.3). As already stated, no more than five are allowed per SB and the user may have to split the sources into multiple SGs.


next up previous contents
Next: Calibration Setup Up: Spectral Setup Previous: Spectral Scan   Contents
The ALMA OT Team, 2016 Aug 23