4 - Art Telescopes Ground and Space

4 - Art Telescopes Ground and Space - Keck Observatory --...

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Unformatted text preview: Keck Observatory -- twin 10m telescopes -- Mauna Kea, Hawaii Large, Modern Telescopes Mauna Kea -- Hawaii @ 14000 ft w/ 12 telescopes Why go to high mountains ??? Why go to high mountains ??? Atmosphere absorbs ==> atmospheric density drops a factor 2 every 18000 ft & emits ==> bright background dwarfs faint astro. objects (background varies by factor ~ million from = 0.3-5 micron) Visible Near infrared Keck 10m telescopes 36 hexagonal segments 1993-present 0.3-30 micron wavelengths (UV to mid-IR) Mirror surface accuracy ~30 nm 2 tel. also used as interferometer next generation telescopes TMT -- 30 m Telescope Caltech, UC, Can., Japan, China, India Detectors -- comparison of sensitivities Faintest long exposures reach ~30 mag ==> 25 mag better the eye factor 10 10 M81- distance = 12 Mlyr (million light years) visible light from ground infrared w/ Spitzer satellite also important to observe across the EM spectrum galaxies appear very differently at diff. wavelengths CCDs (~1978-present) Quantum efFciency ~90%; 0.3-1 micron (~1-2% for photographic plates) current State of the Art: arrays of tens of 16Mpix devices IR arrays (~late 1980s- present) catching up with CCDs in low noise, size Electronic detectors : Detectors : x-ray, optical, near infrared :...
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4 - Art Telescopes Ground and Space - Keck Observatory --...

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