Radio Astronomy: An Informal Talk

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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

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Radio Astronomy:An Informal TalkPresented to theHigh School Students Science/Technology Conference19 October 2007byDr. Harold Geller, GMUWhat Ill talk aboutTelescopesElectromagnetic wavesRadioastronomy basicsNRAO at Green Bank, West VirginiaSmall Radio Telescope at George Mason UniversityWhat 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 planetsLooking Beyond the EyesOptical TelescopesReflectorRefractorDifferent Views of SunSun in Hydrogen-alphaSun in X-rayRadio Astronomy BasicsA Little More DetailJanskys Original RadiotelescopeGrote Rebers Telescope170 foot Diameter Radio-telescope at Green Bank, WVThe 100-meter Green Bank TelescopeEven Bigger than you ThinkJupiter in RadioSaturn in Radio3C296 Radio/Optical CompositeA 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 mediumSmall 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 antennaGMU 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 2003Did You Say Fragile?Picking Up the Pieces on the RoofWhistle While You WorkToleranceCleanup On The RoofThe Base Of SRTServo Motors AttachmentServos with Ring AssemblyDish/Receiver AssemblyReadying for Final Mechanical AssemblyFrom Mechanical to ElectricalAssembled and Ready to TestSample DataEven Smaller - Radio JoveSmall Radio Science Demonstration ProjectsUndergraduate researchSteve Richardsonweb site built with some results from data acquired using U of Indianapolishttp://physics.gmu.edu/~arichar6/radio/index.htmlprepared presentation for GMU innovations fairprepared presentation for CPAC meeting at Bucknell UniversityReally SmoothingPlaying With The DataA Potpourri Of ColorFamily Portrait (radioastronomy conference)Radio Astronomy Observatory at George Mason UniversityLooking To The FutureGMU Optical ObservatoryOnLine Referenceshttp://www.aoc.nrao.edu/intro/image.index.htmlhttp://www.aoc.nrao.edu/intro/faq.htmlhttp://donald.phast.umass.edu/~fcrao/education/report1.htmlhttp://www.haystack.mit.edu/http://www.jpl.nasa.gov/radioastronomy/http://www.bambi.net/sara.htmlhttp://radiojove.gsfc.nasa.gov/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

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