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Semelhante a WV Governor’s School Lecture
Semelhante a WV Governor’s School Lecture (20)
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WV Governor’s School Lecture
- 1. A True Story of Astronomy in the Desert Nicole Gugliucci for the PAPER Team PAPER is a UVa/Berkeley/NRAO/UPenn/SKA-SA Production
- 2. Why do radio astronomers hide from people?
- 3. Why do radio astronomers hide from people?
- 4. Why do radio astronomers hide from people?
- 7. The new [epoch of reionization] map may carry more information than even the cosmic microwave background radiation. - Avi Loeb, Scientific American, Nov. 06 We are looking to see the signal of the neutral hydrogen during reionization. 3 September 2008 N. Gugliucci – CAS 7
- 8. http://people.su.se/~gmell/lib/exe/fetch.php?cache=cache&media=xy_100mpc_406.gif GarreltMellema 8
- 9. Z=9 or 556 million yrs after BB Z=8 or 652 million yrs after BB Z=7 or 778 million yrs after BB Z=6 or 950 million yrs after BB by Trac & Cen (2007)
- 10. Signal vs. Foregrounds at 140 MHz MW synchrotron (Power) Point Sources MW free-free E-gal free-free EoR CMB (Multipole Moment)
- 11. Signal vs. Foregrounds at 140 MHz MW synchrotron (Power) Point Sources MW free-free E-gal free-free EoR CMB (Multipole Moment)
- 12. Seeing in the Dark The 21 cm or 1.4 GHz transition marks a protected band for radio astronomy, due to the importance of hydrogen as an astronomical tracer. However, the hydrogen at the EoR is redshifted to a lower frequency. Machele Cable of Wake Forest Ned Wright's Cosmology Tutorial Reionization occurs z ~ 6 - 14, redshifted to 100 – 230 MHz
- 16. Array, or, Interferometer Actual imaging of the neutral hydrogen will take many more times the sensitivity of current telescopes Instead, measure power spectrum. This is natural for an interferometer, which detects spatial frequencies Christian Deichert www.daviddarling.info
- 17. 17 More on Interferometry 1-D Fourier Transforms www.bruker-biospin.com
- 18. 18 More on Interferometry 1-D Fourier Transforms www.bruker-biospin.com 2-element response Prof. Dale E. Gary - NJIT
- 19. 19 More on Interferometry 1-D Fourier Transforms www.bruker-biospin.com + + +… Prof. Dale E. Gary - NJIT
- 20. 20 More on Interferometry 1-D Fourier Transforms www.bruker-biospin.com + + +… Prof. Dale E. Gary - NJIT
- 21. 21 More on Interferometry 1-D Fourier Transforms www.bruker-biospin.com + + +… Prof. Dale E. Gary - NJIT
- 22. What was the early universe like?
- 24. PAPER System
- 28. The Ionosphere http://madrigal.haystack.mit.edu/models/IRI/index.html http://radiojove.gsfc.nasa.gov
- 30. Astronomy in the desert… Far away from humans for next generation radio telescopes PAPER is poised to make the first detection of the Epoch of Reionization signal, giving us a clue to the first stars and galaxies Upcoming projects need bright young scientists and engineers to continue these explorations
- 31. Thank you!
Notas do Editor
- Audience participation
- These all give off signals
- So, we protect ourselves by location
- And we’ve used this site to our advantage
- What are we looking for with this weird looking contraption?
- Next, animation
- And if that doesn’t work…
- So so faint…
- Not to mention, human-made signals
- What signal are we looking for exactly?
- z = 7 was 12.9 billion years ago…And that’s right near the FM band
- For such an experiment, we need to find a much more remote site…
- What are we building?
- A whole array? What does that do? (optional interferometry section is next)
- To answer this, I spent my summer “vacation”…
- Hidden system slide next, then array pic (64!)
- What can we do with this?
- With 64…
- Make maps and catalogues, find new SNRs, further characterize the instrument, etc…Note on what I do
- Next step…
- 128! And later, HERAEmphasize student involvement