Course : Εισαγωγή στη Ραδιοστρονομία
Course code : PH338C
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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
VLBI, astrometry, geodesy, and extreme angular resolution
Lecture topics
Very Long Baseline Interferometry in detail. Independent clocks, hydrogen masers, baseband recording, correlation, delay models, phase referencing, fringe fitting. Astrometry, parallax, proper motion, AGN jets, masers, spacecraft tracking, geodesy. Relationship between connected-element interferometry and VLBI. Why VLBI is brutal but powerful.
Key concepts
Fringes, fringe rate, group delay, phase referencing, closure phase, maser clocks, correlation, astrometric precision.