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
Introduction: What is radio astronomy
Lecture topics
Radio astronomy in the electromagnetic spectrum. Wavelength, frequency, photon energy, flux density, Jansky, luminosity, brightness, intensity, brightness temperature. Why radio is different: coherent detection, phase information, large beams, foregrounds, RFI, long wavelengths, and diffraction-limited resolution.
Introduce the major science themes: cold gas, synchrotron emission, star formation, pulsars, masers, AGN jets, CMB, FRBs, molecular gas, black holes, technosignatures.
Key concepts
Flux density, specific intensity, brightness temperature, Rayleigh–Jeans approximation, solid angle, beam size.