Course : Εισαγωγή στη Ραδιοστρονομία
Course code : PH338C
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Display all units
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Introduction: What is radio astronomy
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Radiation mechanisms in the radio window
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Propagation through plasmas and the interstellar medium
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Antennas, beams, and single-dish observing
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Receivers, backends, digitization, and RFI
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Spectral-line radio astronomy
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Polarization and magnetic fields
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Pulsars and pulsar timing
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Transients, FRBs, surveys, and time-domain radio astronomy
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Interferometry I: the fundamental idea
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Interferometry II: calibration and imaging
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VLBI, astrometry, geodesy, and extreme angular resolution
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High-frequency radio astronomy: ALMA, sub-mm astronomy, and the EHT
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SETI, technosignatures, future facilities
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Introduction: What is radio astronomy
Interferometry I: the fundamental idea
Lecture topics
Why interferometry is necessary. Two-element interferometer. Visibility as a Fourier component of the sky brightness. Baselines, uv-plane, fringe spacing, coherence, delay tracking. Earth-rotation synthesis. The van Cittert–Zernike theorem in practical terms.
Key concepts
Visibility, uv-coverage, baseline, synthesized beam, dirty image, primary beam.