# ASTR 2310: Chapter 6

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1 ASTR 231: Chapter 6 Astronomical Detection of Light The Telescope as a Camera Refraction and Reflection Telescopes Quality of Images Astronomical Instruments and Detectors Observations and Photon Counting Other Wavelengths Modern Telescopes

2 Refracting / Reflecting Telescopes Focal length Focal length Refracting Telescope: Lens focuses light onto the focal plane Reflecting Telescope: Concave Mirror focuses light onto the focal plane Almost all modern telescopes are reflecting telescopes.

3 Secondary Optics In reflecting telescopes: Secondary mirror, to redirect light path towards back or side of incoming light path. Eyepiece: To view and enlarge the small image produced in the focal plane of the primary optics.

4 Disadvantages of Refracting Telescopes Chromatic aberration: Different wavelengths are focused at different focal lengths (prism effect). Can be corrected, but not eliminated by second lens out of different material. Difficult and expensive to produce: All surfaces must be perfectly shaped; glass must be flawless; lens can only be supported at the edges.

5 The Best Location for a Telescope Far away from civilization to avoid light pollution

6 The Best Location for a Telescope (II) Paranal Observatory (ESO), Chile On high mountain-tops to avoid atmospheric turbulence ( seeing) and other weather effects

7 The Powers of a Telescope: Size does matter! 1. Light-gathering power: Depends on the surface area A of the primary lens / mirror, proportional to diameter squared: A = pi (D/2)2 D

8 The Powers of a Telescope (II) 2. Resolving power: Wave nature of light => The telescope aperture produces fringe rings that set a limit to the resolution of the telescope. Astronomers can t eliminate these diffraction fringes, but the larger a telescope is in diameter, the smaller the diffraction fringes are. Thus the larger the telescope, the better its resolving power. θmin = 1.22 (λ/d) (radians) For optical wavelengths, this gives θmin = 11.6 arcsec / D[cm] min

9 The Powers of a Telescope (III) 3. Magnifying Power = ability of the telescope to make the image appear bigger. A larger magnification does not improve the resolving power of the telescope!

10 Traditional Telescopes (I) Secondary mirror Traditional primary mirror: sturdy, heavy to avoid distortions.

11 Traditional Telescopes (II) The 4-m Mayall Telescope at Kitt Peak National Observatory (Arizona)

12 Astronomical Telescopes Often very large to gather large amounts of light. In order to observe forms of radiation other than visible light, very different telescope designs are needed. The northern Gemini Telescope on Hawaii

13 Examples of Modern Telescope Design The Very Large Telescope (VLT)

14 Seeing Weather conditions and turbulence in the atmosphere set further limits to the quality of astronomical images

15 Advances in Modern Telescope Design Lighter mirrors with lighter support structures, to be controlled dynamically by computers Floppy mirror Segmented mirror

16 Adaptive Optics Computer-controlled mirror support adjusts the mirror surface (many times per second) to compensate for distortions by atmospheric turbulence

17 Interferometry Recall: Resolving power of a telescope depends on diameter D. Combine the signals from several smaller telescopes to simulate one big mirror Interferometry

18 CCD Imaging CCD = Charge-coupled device More sensitive than photographic plates Data can be read directly into computer memory, allowing easy electronic manipulations False-color image to visualize brightness contours

19 The Spectrograph Using a prism (or a grating), light can be split up into different wavelengths (colors!) to produce a spectrum. Spectral lines in a spectrum tell us about the chemical composition and other properties of the observed object

20 Radio Astronomy Recall: Radio waves of ~ 1 cm 1 m also penetrate the Earth s atmosphere and can be observed from the ground.

21 Radio Telescopes Large dish focuses the energy of radio waves onto a small receiver (antenna) Amplified signals are stored in computers and converted into images, spectra, etc.

22 Radio Interferometry Just as for optical telescopes, the resolving power of a radio telescope depends on the diameter of the objective lens or mirror min = 1.22 /D. For radio telescopes, this is a big problem: Radio waves are much longer than visible light Use interferometry to The Very Large Array (VLA): 27 dishes are combined to simulate a large dish of 36 km in diameter.

23 The Largest Radio Telescopes The 1-m Green Bank Telescope in Green Bank, West The 3-m telescope in

24 Science of Radio Astronomy Radio astronomy reveals several features, not visible at other wavelengths: Neutral hydrogen clouds (which don t emit any visible light), containing ~ 9 % of all the atoms in the universe. Molecules (often located in dense clouds, where visible light is completely absorbed). Radio waves penetrate gas and dust clouds, so we can observe regions from which visible light is heavily absorbed.

25 Infrared Astronomy Most infrared radiation is absorbed in the lower atmosphere. However, from high mountain tops or highflying aircraft, some infrared radiation can still be observed.

26 Infrared Telescopes Spitzer Space Telescope WIRO 2.3m

27 Ultraviolet Astronomy Ultraviolet radiation with < 29 nm is completely absorbed in the ozone layer of the atmosphere. Ultraviolet astronomy has to be done from satellites. Several successful ultraviolet astronomy satellites: IUE, EUVE, FUSE Ultraviolet radiation traces hot (tens of thousands of degrees), moderately ionized gas in the universe.

28 NASA s Great Observatories in Space (I) The Hubble Space Telescope Launched in 199; maintained and upgraded by several space shuttle service missions throughout the 199s and early 2 s Avoids turbulence in Earth s atmosphere Extends imaging and spectroscopy to (invisible) infrared

29 Hubble Space Telescope Images Mars with its polar ice cap Nebula around A dust-filled galaxy

30 NASA s Great Observatories in Space (II) The Compton Gamma-Ray Observatory Operated from 1991 to 2 Observation of high-energy gamma-ray emission, tracing the most violent processes in the universe.

31 NASA s Great Observatories in Space (III) The Chandra X-ray Telescope Launched in 1999 into a highly eccentric orbit that takes it 1/3 of the way to the moon! X-rays trace hot (million degrees), highly ionized gas in the universe. Two colliding galaxies, triggering a burst of star formation Very hot gas in a cluster of galaxies

32 Chandra X-ray Observatory Shuttle launched, highly eccentric orbit.

33 The Highest Tech Mirrors Ever! Chandra is the first X-ray telescope to have image as sharp as optical

34 NASA s Great Observatories in Space (IV) The Spitzer Space Telescope Launched in 23 Infrared light traces warm dust in the universe. The detector needs to be cooled to -273 oc (-459 of).

35 Spitzer Space Telescope Images A Comet Warm dust in a young spiral galaxy Newborn stars that would be hidden from our view in

36 Spitzer Space Telescope Discovered by a Wyoming grad student and professor. The Cowboy Cluster an overlooked

37 Kepler s Supernova with all three of NASA s Great Observatories Just 4 years ago: (Oct. 9, 164) Then a bright, naked eye object (no telescopes) It s still blowing up now 14 light years wide and expanding at 4 million mph. There s material there at MANY temperatures, so many wavelengths are

38 A Multiwavelength Look at Cygnus A

39

40 The Future of Space-Based Optical/Infrared Astronomy: The James Webb Space Telescope

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