Neha Patil (Editor)

Large Aperture Experiment to Detect the Dark Ages

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Built
  
in construction

Diameter
  
500 m

Telescope style
  
dipole antenna array

Organisation
  
Harvard, UC Berkeley, UNM, Virginia Tech

Location(s)
  
the Long Wavelength Array site, adjacent to the Very Large Array in New Mexico

Wavelength
  
radio 3.4–10 m (30–88 MHz)

The Large-Aperture Experiment to Detect the Dark Ages (LEDA) is designed to detect the spectrum of the 21 cm Hydrogen line from the Intergalactic Medium (IGM) at redshifts of 15-30, when the Universe was just ~1% of its present age. LEDA principally comprises a "large-N" array correlator (512 inputs over ~ 60 MHz), calibration & imaging system, and instrumentation for measurement of calibrated total-power. These systems will use the station 1 of the Long Wavelength Array as an aperture. LEDA is one of several efforts seeking to study cosmological reionization and the preceding Dark Ages. Others include the Precision Array for Probing the Epoch of Reionization (PAPER), Low Frequency Array (LOFAR), Murchison Widefield Array (MWA), and Giant Metrewave Radio Telescope (GMRT). LEDA will feature array-based calibration to improve the accuracy of foreground subtraction from the total-power signal. The project received funding from the National Science Foundation in August 2011.

References

Large Aperture Experiment to Detect the Dark Ages Wikipedia