[ppt]powerpoint presentation - risa wechsler -...
TRANSCRIPT
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Midterm Distribution31 A’s, 37 B’s, 26 C’s, 21 D’s, 17 F’s
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Common Mistakes
Do the algebra first! Units, Units, Units Does your answer make sense? Using ratios
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Lecture 18:
Telescopes and
Observational Astronomy
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There are two kinds of telescopes
RefractingRefracting: a lens is used to focus the light from distant objects.
ReflectingReflecting: a primary mirror is used to gather and focus light.
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A Refracting Telescope
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A Reflecting Telescope
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Alternative designs for reflecting telescopes
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Charge Coupled Devices (CCD)
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Fundamental Telescope Properties
Light collecting area (diameter of primary mirror or lens)
angular resolution (smallest angular distance that can be resolved clearly) limited by effects of Earth’s atmosphere
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Angular Separation
= 360o . s /(2d) “small angle formula”
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Angular Resolution
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Diffraction
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The Diffraction Limitdiffraction limit = 2.5 x 105 x wavelength of light(arcsec) diameter of telescope
Find the diffraction limit of the 2.4 m Hubble Space Telescope for visible light (500 nm).
d.l. = 2.5 x 105 (500 x 10-9 m/2.4 m) = 0.05 arcsec
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Where to put your telescope high and dry – to minimize the blurring
effects of the Earth’s atmosphere and emission/absorption from water vapor
away from light pollution with roads, electricity, and other support
systems nearby
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The Summit of Mauna Kea
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The Keck Telescopes
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The Magellan Telescopes
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Basic Functions of Telescopes
Imaging/photometryaccurate measurement of light intensity filters can be used to separate into different
colors spectroscopy
light spread out using a diffraction grating time sequence
how an object’s brightness changes with time
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A Basic Spectrograph
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Spectral Resolution
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Telescopes across the spectrum
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Hubble Space Telescope
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Infra-red Telescopes
SOFIA
SIRTF
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Radio Telescopes
Arecibo
Very Large Array (VLA)
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Interferometry An array of smaller
telescopes can be used together
the light gathering power is equal to the sum of all the areas
the angular resolution is greatly improved
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X-ray Telescopes
grazing incidence mirror
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Chandra X-ray Observatory
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Compton Gamma-ray Observatory
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Images of non-visible light
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Radio
CO
FIR
NIR
vis.
X-ray
gammaray