10.3.07 Astronomy Notes

10.3.07 Astronomy Notes - that has the accuracy of a...

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10.3.2007 – Astronomy O 3 blocks between UV and Gamma rays H 2 O and CO 2 block far infrared H 2 O and O 2 block short wavelength radio Ionosphere blocks long wavelength radio Azimuth = rotation on the horizon Altitude mount = opposite of azimuth. Goes up and down 200 radio telescopes around the world, around 85 feet in diameter. Equatorially mounted Angular resolution of radio telescopes: [arc min] = 40 * [cm] / D [m] θ λ Interferometers = telescopes that are set a certain distance apart. They can build an image
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Unformatted text preview: that has the accuracy of a telescope that is as big as they are far apart. ALMA. Meant for high frequency radio True color vs. false color: arbitrary colors assigned to infrared = false Continuum is the spectrum of radio HI: neutral hydrogen most common gas in universe. Wavelength = 21 cm HII: ionized hydrogen Spin flip transition Radio Emission processes: 1. Blackbody. Anything with temperature 2. HI (cold, neutral hydrogen). Spectral line only one wavelength...
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