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If selected by the user, the following user settings will also need to be justified. A free-format box appears for each.
- Non-Nyquist mosaic sampling: Non-Nyquist values are usually used when the scientific goal is to cover a large survey area and large-scale structures are not being observed. Polarization mosaicing may benefit from sampling at higher than the Nyquist frequency.
- Single polarization: Dual polarization is more usually selected and single polarization only used when the highest spectral resolution is required.
- Low max elevation: Sources with low declinations will suffer large atmospheric attenuation and be difficult to schedule because of limited time above the horizon.
- User-defined calibration: As the observatory guarantees appropriate calibration without user input, this must be rigorously justified.
- Override of OT's sensitivity-based time estimate: This may be necessary if you want to monitor a source over a certain time span or if your source has a complicated structure but the sensitivity-based time estimate does not allow for sufficient
-coverage. You must give a detailed justification for the time override, and explain how the new time estimate was calculated. The time override must include calibrations and overheads.
- Time-constrained observing: These imply significant constraints on the scheduling of all ALMA projects and must therefore be fully justified.
- Astrometry: If enhanced positional accuracy was selected, please explain why this is necessary i.e. state the positional requirements with reference to what ALMA provides by default (consult the Proposer's Guide and Technical Handbook for more information).
- Solar Technical Justification: All technical details of solar observations should be discussed in this text box. See the Proposer's Guide for more information.
- VLBI Technical Justification: All technical details of VLBI observations should be discussed in this text box. If passive phasing has been selected then the choice of calibrator must be discussed in the box reserved for that purpose. See the Proposer's Guide for more information.
- Phased Array Technical Justification: All technical details of phased-array observations should be discussed in this text box and there should also be discussion of the post-processing steps. See the Proposer's Guide for more information.
- Passive Phasing Technical Justification: Describe here the source selected to be used for passive phasing i.e. why it is suitable to be used for this purpose. Its brightness and proximity should be discussed.
Next: Phase 2 Program Scheduling
Up: Technical Justification
Previous: Correlator configuration
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The ALMA OT Team, 2021 Feb 03