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The Fascinating World of Radio Astronomy: Exploring the Universe with Radio Waves

Discover the wonders of radio astronomy, from exploring the Milky Way to detecting molecules in space. Learn how radio telescopes work, what resolutions they provide, and delve into magnetic fields in Active Galactic Nuclei.

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The Fascinating World of Radio Astronomy: Exploring the Universe with Radio Waves

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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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