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
Spectral-line radio astronomy
Lecture topics
The 21-cm hydrogen line, molecular rotational transitions, recombination lines, masers. Doppler shifts, velocity conventions, line profiles, optical depth, column density. Galactic rotation, HI surveys, molecular clouds, star formation, extragalactic gas.
Key concepts
Rest frequency, radial velocity, line width, column density, spin temperature, molecular tracers, critical density.