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Radio Astronomy

Radio Astronomy. Troy Russell B-Section Physics Club Treasurer EE Major Acoustics Minor. Wednesday, April, 27, 2011. Topics. What When How Who Where Why Project Sources. What. Cosmic Microwave Background Radiation Cold Space image View Hydrogen Motion Black Hole study.

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Radio Astronomy

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  1. Radio Astronomy Troy Russell B-Section Physics Club Treasurer EE Major Acoustics Minor Wednesday, April, 27, 2011

  2. Topics What When How Who Where Why Project Sources

  3. What Cosmic Microwave Background Radiation Cold Space image View Hydrogen Motion Black Hole study This composite image of the Whirlpool Galaxy, Messier 51, shows that the radio emission from the galaxy’s cold hydrogen gas (blue) extends well beyond the optical light emitted by its stars (Credit: NRAO/AUI, J. Uson).

  4. When 1930’s Bell Labs Karl Jansky Radio Telecommunications Experimentation Static Interference with Signal First thought was from Sun Repeated every 23 hours 56 minutes (Sidereal Day) Milky Way Galaxy

  5. How Singular Sky Scan EM waves Dish Reflector Receiver Dipole Antenna Interferometry

  6. Reflector Large Dish Four Configurations Axial Feed Off-Axis Feed Cassegrain Gregorian Parabolic Shape Focus EM radiation Imperfections: <λ/20

  7. Reflector Configurations

  8. Dipole Antenna An antenna is a device for converting electromagnetic radiation in space into electrical currents in conductors or vice-versa, depending on whether it is being used for receiving or for transmitting, respectively

  9. Perpendicular Dipole End of Waveguide Collect Radiation from other Polarized patterns Linear Circular Elliptical Low Noise Block Down Converter Using a Perpendicular Dipole Antenna

  10. Interferometry Signal A received Signal B received later Time based signals overlaid with delay removed Signal A + Signal B = Greater Resolution

  11. Who Astronomers Scientists Researchers

  12. Where Anywhere / Anytime Radio pierces cloud cover Day or Night Some interference from local radio frequency based systems on ground or orbit

  13. Why Cosmic Rays Study Earliest Generation of a Galaxy Big Bang Knowledge Black Holes Neutral Hydrogen Pulsars Cold Gas The Rotating Disk of M33

  14. Project Itty Bitty Radio Telescope Stage 1: Acquire parts Stage 2: Assemble Telescope Stage 3: Begin Simple Testing Stage 4: Add Refinements

  15. Acquire Parts Craigslist Dish Radio Shack Cables/Hardware Est. Price ~ $30-$40 (Pending Conditions) Time Spent Acquiring Parts: 3 – 6 Hours

  16. Assemble Telescope Simplistic Design Easy Directions Total Time Spent in Assembly: 2-4 hours

  17. Simple Testing Point Telescope Sun Moon Radio Transmitters Etc. Gain Understanding Sources Scope Usage Time Spent Testing: 2 – 6 Hours

  18. Add Refinements Attach Scope to PC Create Images on PC Sensitivity Plan second iteration More Complex Interferometry Larger Dish Endless Possibilities Time Adding Refinements: 2 – 10 Hours

  19. Benefits Team building Club equipment construction Radio Telescope Concepts Usage methods Potential Research Future refinement projects Future Astronomy Projects Possible Outreach

  20. Sources Gay, Pamela L. "Astronomy Cast Episode 130: Radio Astronomy." Interview by Fraser Cain. Audio blog post. Astronomy Cast. Web. 7 Apr. 2011. <http://www.astronomycast.com/astronomy/episode-130- radio-astronomy/>. "Radio Astronomy." National Radio Astronomy Observatory (NRAO): Look Deeper. NRAO. Web. 07 Apr. 2011. http://www.nrao.edu/index.php/learn/radioastronomy Basics of Radio Astronomy for the Goldstone-Apple Valley Radio Telescope - Diane Fisher Mille http://www.lesia.obspm.fr/plasma/Goutelas2007/Presentations/Torchinsky/Torchinsky-History.pdf National Science Foundation Website Kutner, Marc. "4.8 Radio Astronomy." Astronomy: A Physical Perspective. Cambridge UP. 69. Print.

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