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Observations - Coggle Diagram
Observations
Properties of Astronomical Objects
Position & Motion
Astrometry
Line width
Mass
Proper motion and Radial Velocity
Redshift
Gravity and Rotation
Virial theorem
Size & Morphology
Angular size and distance
Unresolved sources
Unresolved star
Unresolved planet
Unresolved orbit
Imaging
Ellipticals
Unbarred spirals
Lenticular
Barred spirals
Irregular (Irr)
Luminosity
Flux and distance
Temperature
Kinetic (thermometer)
Effective temperature
Color index
Excitation and Ionization
Age
Population
Population synthesis
Single stars
Environment
Multiple stars and clusters
Galaxy clusters
ISM and IGM
Composition
Atomic / metallicity and molecular
Through extinction and reddening
Structure
Magnetic field: synchrotron radiation & polarization
Components
stellar population
ISM / gas + dust
dark matter
central blackhole
Variation with time
Stellar Evolution
e.g. star formation rate, accretion rate
Evolution of galaxies
Measure Distance
Trigonometry
Angular speed vs. Radial velocity (for star clusters)
Brightness vs. Luminosity
Standard candles
individual objects
Variables
Supernova
Type Ia supernova
Spectroscopuc parallax
ensmebles of stars
L distribution ("functions")
Kinematics
Surface brightness fluctuations
Distance ladder
Quantify Measurements
Siganl-to-Noise Ratio
Errors
Systematic vs. Random Errors
Uncertainty and precision
Bias and accuracy
Random processes: Poisson