Radio Astronomy: An Informal Talk

Download Radio Astronomy: An Informal Talk

Post on 12-Jan-2016




0 download

Embed Size (px)


Radio Astronomy: An Informal Talk. Presented to the High School Students Science/Technology Conference 19 October 2007 by Dr. Harold Geller, GMU. What Ill talk about. Telescopes Electromagnetic waves Radioastronomy basics NRAO at Green Bank, West Virginia - PowerPoint PPT Presentation


  • Radio Astronomy:An Informal TalkPresented to theHigh School Students Science/Technology Conference19 October 2007byDr. Harold Geller, GMU

  • What Ill talk aboutTelescopesElectromagnetic wavesRadioastronomy basicsNRAO at Green Bank, West VirginiaSmall Radio Telescope at George Mason University

  • What does a telescope do?Collect electromagnetic wavesCollecting ability proportional to the square of the diameter of the objectiveResolve electromagnetic sourcesRelated to the atmosphere, wavelength and curvature of the objectiveMagnify surfaces of planets and the MoonMagnification only of Moon, Sun and planets

  • Looking Beyond the Eyes

  • Optical TelescopesReflectorRefractor

  • Different Views of SunSun in Hydrogen-alphaSun in X-ray

  • Radio Astronomy Basics

  • A Little More Detail

  • Janskys Original Radiotelescope

  • Grote Rebers Telescope

  • 170 foot Diameter Radio-telescope at Green Bank, WV

  • The 100-meter Green Bank Telescope

  • Even Bigger than you Think

  • Jupiter in Radio

  • Saturn in Radio

  • 3C296 Radio/Optical Composite

  • A Vision for George Mason (based upon Univ. Indianapolis)

  • Small Radio Telescope JustificationRadio science observations in the L-band L-band lies in the 1400-1427 MHz region of the electromagnetic spectrumdetection of what astronomers call the 21-cm line of hydrogenthis is a portion of the hydrogen spectrum, in the radio region of the electromagnetic spectrum, which is generated by the neutral hydrogen clouds in the interstellar medium

  • Small Radio Telescope JustificationObservations in C-band, which is 4313-4338 MHz and 3788-3813 MHzRadio science observations in the C-band allow for the radio emission examination of the moon, which acts as a body at a temperature of 200 K.Students will be able to scan the moon, and detect the estimated 6000 joules of energy from the lunar surface.

  • GMU SRT BackgroundFundingNational Science Foundationeducation portion of grant won by Dr. Rita SambrunaOrder Historyordered first week of June 2002stated 12 week delivery timereceived 15 October 2002damaged antenna

  • GMU SRT Background Part IIOrder Historyboxes damagedFedEx insurance inspector called and visited to assess damage - refused claimreplacement parts to be shipped by vendorBase assembled on roof1 November 2002Remaining electronics and replacement antenna parts received 30 January 2003

  • Did You Say Fragile?

  • Picking Up the Pieces on the Roof

  • Whistle While You Work

  • Tolerance

  • Cleanup On The Roof

  • The Base Of SRT

  • Servo Motors Attachment

  • Servos with Ring Assembly

  • Dish/Receiver Assembly

  • Readying for Final Mechanical Assembly

  • From Mechanical to Electrical

  • Assembled and Ready to Test

  • Sample Data

  • Even Smaller - Radio Jove

  • Small Radio Science Demonstration ProjectsUndergraduate researchSteve Richardsonweb site built with some results from data acquired using U of Indianapolis presentation for GMU innovations fairprepared presentation for CPAC meeting at Bucknell University

  • Really Smoothing

  • Playing With The Data

  • A Potpourri Of Color

  • Family Portrait (radioastronomy conference)

  • Radio Astronomy Observatory at George Mason University

  • Looking To The Future

  • GMU Optical Observatory

  • OnLine References

  • Book ReferencesRadio Astronomy by John D. KrausAn Introduction to Radio Astronomy by Bernard BurkeThe Amateur Radio Astronomers Handbook by John Potter ShieldsRadio Astronomy for the Amateur by David HeisermanRadio Astronomy (Above and Beyond) by Adele Richardson


View more >