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What is Radio Astronomy?

What is Radio Astronomy?. MIT Haystack Observatory This material was developed under a grant from the National Science Foundation. The Electromagnetic Spectrum. Spans a range of wavelengths Visible is just a narrow range Radiowaves span a large range - from under 1mm to several meters.

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What is Radio Astronomy?

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  1. What is Radio Astronomy? MIT Haystack Observatory This material was developed under a grant from the National Science Foundation

  2. The Electromagnetic Spectrum • Spans a range of wavelengths • Visible is just a narrow range • Radiowaves span a large range - from under 1mm to several meters

  3. Sources of Radio emission • Solar System - sun, planets • Milky way - star forming regions, old stars, supernova remnants • Extragalactic - quasars, radio jets • Molecules

  4. SunOPTICAL RADIO XRAY

  5. SaturnRADIO INFRARED OPTICAL ULTRAVIOLET

  6. Orion Nebula: Stars are born…RADIO INFRARED OPTICAL XRAY

  7. Crab Nebula: a star that died in 1054RADIO OPTICAL XRAY

  8. Cassiopeia A: a star that died in ~1700RADIO INFRARED OPTICAL XRAY

  9. Sagittarius A: Mystery Mass in Galaxy CenterRADIO OPTICAL

  10. Virgo A: Hidden Massive Black Hole shooting out a JetRADIO OPTICAL

  11. Molecules

  12. What are molecules good for? • Detections - newest one - “glycoaldehyde” (sugar) • Probes - measure temperature, density, chemistry • Kinematics - velocities - doppler effect

  13. HC3N as a density probe in the Taurus Molecular Cloud (TMC-1)

  14. CH3CCH as a temperature probe in TMC-1

  15. Model of H2O maser emission around NGC4258

  16. How do radio telescopes work?

  17. What is Resolution?

  18. Interferometry Getting better “resolution”

  19. NRAO/AUI Compare the radio image on the right, made with the Haystack 37-m single dish telescope at a frequency of 43 GHz with the radio image above made with the 27-element Very Large Array.

  20. VLBI images of SiO maser emission in Orion and a possible model

  21. SiO Masers around a highly evolved star - R Cassiopeia

  22. VLBI sequence of a supernova in M81

  23. Magnetic Fields in Active Galactic Nuclei • The Blazar 1055+018 • Active Galactic Nuclei • 15 billion light years distant • AGN are 40 times more luminous and 10,000 times larger than the brightest “normal” galaxies • Displays a colossal jet of relativistic plasma • Powered by a supermassive, rotating black hole

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