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Astronomy Picture of the Day – 16 Jul 06

Astronomy Picture of the Day – 16 Jul 06

fabrizio-bellew
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Astronomy Picture of the Day – 16 Jul 06

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  1. Astronomy Picture of the Day – 16 Jul 06 “The center of our Galaxy is a busy place. In visible light, much of the Galactic Center is obscured by opaque dust. In infrared light, however, dust glows more and obscures less, allowing nearly one million stars to be recorded in the above photograph. The Galactic Center itself appears on the right and is located about 30,000 light years away towards the constellation of Sagittarius. The Galactic Plane of our Milky Way Galaxy, the plane in which the Sun orbits, is identifiable by the dark diagonal dust lane. The absorbing dust grains are created in the atmospheres of cool red-giant stars and grow in molecular clouds. The region directly surrounding the Galactic Center glows brightly in radio and high-energy radiation, and is thought to house a large black hole.” [taken from http://antwrp.gsfc.nasa.gov/apod/ap060716.html]

  2. REU Summer 2006: KSU SRT Project Ashley K. Wheeler Mentor: Dr. Tim Bolton

  3. Outline • Why radio astronomy? • What is radio astronomy? • Versus optical astronomy? • How are radio waves emitted? • Basic Schematic • Resolution • Summary, pre-REU

  4. Outline, cont. • REU • Software • Sweeps/ Waveforms • Aliasing • What is it? • Why is it a problem? • Data Comparison • Baselines and Averaging • Possible Sources

  5. Outline, cont. • What’s next? • Software • Mounting • For More Information

  6. Why radio astronomy? • What is radio astronomy? • Versus optical astronomy? [figure borrowed from http://www.disp.duke.edu/~dbrady/ece371/notes/l2/spectrum.html]

  7. How are radio waves emitted? • Black bodies • Ionized gas clouds • Change in energy states and masers • Electron plus magnetic field (non-thermal) • Moving magnetic field (non-thermal)

  8. Basic Schematic

  9. Resolution • q = 1.03l/D = 1.03(c/n)/D • 0.02575 radians, or about 1.5 degrees

  10. Summary, pre-REU Sat finders and tees

  11. REU • CNVTWFM • Moved the dish outside • 1st sweep – Jun 20th, 2006

  12. REU, cont.

  13. REU, cont. Aliasing

  14. REU, cont. Data comparison

  15. REU, cont. Baselines and averaging

  16. REU, cont. • Manhattan, KS 39.179642 -> dec. of +39o 10’ 46.7112” • RA = (our time of day) + (5 hrs)

  17. Next, cont. • Signal processing software • Mounting?

  18. For More Information • The Astronomical Almanac • www.radio.uindy.edu • www.nrao.edu/epo/amateur • www.wikipedia.org • www.bambi.net

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