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Radio Astronomy - Coggle Diagram
Radio Astronomy
radio vs optical astronomy
primary difference: wavelength
resolution
305m Arecibo telescope is equivalent to a 0.8mm optical telescope
radio is always diffraction limited
signal detection
as a wave rather than a photon
radio telescope characteristics
Jansky
flux density per unit solid angle
system temperature
sensitive to external man-made noise
source of radio emission
blackbody
cosmic microwave background & planets
continuum sources
Bremsstralung
Synchrotron
spectral line sources
radio emission lines
Neutral Hydrogen spin-flip transition
21cm line of Neutral Hydrogen
shifted by expansion of universe
broadened by rotation
recombination lines
Molecular lines