Welcome!

Introductions

The Multiwavelength Sky

• in Galactic coordinates, with constellations
• optical
• 21 cm, coded by sightline velocity
• radio continuum at 408 MHz
• microwave microwave continuum; CMB high-contrast map
• CO molecules
• near IR
• mid-far IR
• soft X-ray continuum (source)
• hard X-ray continuum
• 511 keV
• 1.8 MeV and its origin
• gamma rays above 100 MeV, above 1 GeV

Spectra

• the Sun: spectral image, plot--optical, UV, IR
• planetary nebula: Ring nebula optical, spectra: 2d, 1d
• galaxy clusters: Virgo imaged in optical, X-ray spectrum; Abell 2319 imaged in optical and microwave
• extragalactic HII region, namely I Zwicky 18
• mystery spectrum (source)
• another mystery spectrum; source image and paper

Observables

The Electromagnetic Spectrum

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