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Conference Summary Ue-Li Pen

Conference Summary Ue-Li Pen. Overview. Young, vibrant field! Rapid progress: searching for needles in a haystack. Lots of technical developments Interest and impact in many related science fields Possibly leading field in papers/data point First maps and power spectra of HI at z>0.5.

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Conference Summary Ue-Li Pen

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  1. Conference SummaryUe-Li Pen

  2. Overview • Young, vibrant field! • Rapid progress: searching for needles in a haystack. • Lots of technical developments • Interest and impact in many related science fields • Possibly leading field in papers/data point • First maps and power spectra of HI at z>0.5

  3. 25 years ago: 21cm @ z=9 foreground subtraction. Bebbington 1986

  4. WSRT-LFFE Partial LOFAR

  5. First all sky 150 MHz map! Parsons et al, PAPER

  6. MWA 32 tiles (32T) 400m …5% prototype for 80-300 MHz Looking through a telescope on observing trip

  7. 32T Pipeline First Light 103 MHz • Observations from January 2010 • 3 x 7hr tracks with real-time calibration, peeling, imaging, resampling and averaging. • HEALPIX projection of Pic A field. • Pic A peeled to reveal many secondary sources. • Several simplifying assumptions relative to the 512T version, but all of the pieces are in place. 134 MHz 180 MHz 20°x 20° Zenith

  8. Robert C Byrd Telescope: 100m

  9. 760 MHz, z=0.87

  10. SVD foreground subtracted, frequency dependent beam corrected

  11. 100x rescaled: 100 μK 21cm signal

  12. Zadar Foreground Conference Polarized intensity all-sky surveys 1.4 GHz: DRAO (Wolleben et al., 2006) + Villa Elisa (Testori et al., 2008) 22.8 GHz WMAP (Page et al. 2007) depolarization Both surveys on absolute zero-level ! Low intrinsic percentage polarization outside of local features. APS analysis of 1.4 GHz survey (La Porta et al., 2006, 455, 9L ) + extrapolation  ~70 GHz optimal frequency to detect B-mode

  13. Wish list for future instrument • Stable: no moving parts • Stable: minimal active elements • Analysis: Whole sky small field of view • Symmetry: GBT is steerable: uniform maps. At 5x longer wavelength: E-W rotation invariance due to earth rotation. N-S rotation invariance if placed on aircraft carrier. • Compromise: wide N-S cylinders. Optical E-W FFT, digital N-S FFT, continuous frequency compensation, no mode mixing, no w-term!

  14. CMU cylinder under construction: U. Seljak, J. Peterson, K. Bandura, K. Sigurdson

  15. Summary of Summary • Vibrant new young field. • More opportunities for cross experiment interactions. • Many approaches and data sets under way! • “Understanding the galactic and extragalactic foregrounds”: first 1000x subtraction of foregrounds at 15’, 800MHz to reach 100 μK 21cm signal, with zero understanding.

  16. Special thanks • To Vibor and Marjan for organizing a great and successful conference!

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