Planning Spectral Observations

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Presentation transcript:

Planning Spectral Observations Surface Brightness Masers - resolved often at <798Z1kpc HI absorption - background Z106K Resolution Global? Fill in e.g. MERLIN? Check archives NGC4261 van Langevelde et al.

MERLIN archive www.merlin.ac.uk /archive/ EVN archive VL(B)A archives via respective web pages

Line frequency, width, VLSR,rad RFI avoidance Receivers, filters & No. IF's available Correlator capacity NchNpolNBNIF/t<max Resolution HA coverage Sensitivity How long? Calibrators observe more than once! Delay Bandpass - bright! Fringe &/or phase Polarisation leakage Polarisation angle Can be the same source(s) Ask advice!