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Planning Spectral Observations

Planning Spectral Observations. Surface Brightness Masers - resolved often at < 798Z 1kpc HI absorption - background Z 10 6 K 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

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Planning Spectral Observations

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  1. 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.

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

  3. 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!

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