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21 cm Cosmology Jeff Peterson, CMU

21 cm Cosmology Jeff Peterson, CMU. -Existing telescopes and data -Intensity Mapping -Fixed Cylinders. Primary goal of this program:. Precisely constrain dark energy models using 21 cm Baryon Acoustic Oscillation measurements. Context: Previous 21 cm observations. Data from Parkes Telescope.

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21 cm Cosmology Jeff Peterson, CMU

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  1. 21 cm CosmologyJeff Peterson, CMU -Existing telescopes and data -Intensity Mapping -Fixed Cylinders

  2. Primary goal of this program: Precisely constrain dark energy models using 21 cm Baryon Acoustic Oscillation measurements Context: Previous 21 cm observations

  3. Data from Parkes Telescope Milky Way NGC 3419

  4. 21 cm image of Virgo Clusterdata from VLA Galaxy sizes doubled, orange shows X-ray

  5. Optical 21 cm

  6. Arecibo redshift survey Large scale structure matches optical surveys

  7. Optical counterparts

  8. 69% of HI detections lack cataloged optical ID

  9. BAO redshift survey requirements • >10 x Arecibo collecting area AND • > 30 sq degree field • >100 Tera-op/s DSP • RFI mitigation • Proposed telescopes • Square Kilometer Array (SKA) • Hubble Sphere Hydrogen Survey (HSHS)

  10. 2 ea 10 % SKA prototypes“large N small D” • Australia • South Africa X 5,000 + PetaFlop DSP = $1-2 Billion Time frame: 2015-2020, dep. on funding and DSP development schedule

  11. Proposed Hubble Sphere Hydrogen Survey X 1000 +100 Teraflop DSP = $50M (?) Pittsburgh Cylinders Time Scale: 2 yr prototype + 2 yr construction

  12. Intensity Mapping BAO expt. Start with exisiting tel. Then build All-sky filled aperture tel. Program cost ~5 M. Also serves as prototype for HSHS.

  13. First-stars telescopes (z=6-12) LOFAR - Holland MWA - Australia GMRT - India 21cma/past - China

  14. Low Cost LNAs from Cell Phones LNA, $1.81 Filters, $1.99 ea.

  15. PetaFlop DSP technology: FPGAs Inter-FPGA connection layer • N=1024 FFT can be factorized into N = 16*64; p=64 and n=16 and a 2-layer architecture can be employed (64 FPGAs/layer) 64 FPGA Virtex4 SX-55 64 FPGA Virtex4 FX-140 0 0 1 1 63 63

  16. 100 TeraFlop DSP technology: PC Processor Array One of 1024 RF signals 32 32

  17. PAST correlator --- 81 X100 MHz

  18. Conclusions • Current 21 cm redshift surveys ~10 yrs behind optical • New technology should allow leap forward • Continuum source removal unproven • RFI mitigation needed • Long term: 10 sq kilometers telescope might allow all sky survey z = 0 to 12 (or 20, or 50?)

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