skip to main content

SciTech ConnectSciTech Connect

Title: PROBING THE DARK AGES AT z ∼ 20: THE SCI-HI 21 cm ALL-SKY SPECTRUM EXPERIMENT

We present first results from the SCI-HI experiment, which we used to measure the all-sky-averaged 21 cm brightness temperature in the redshift range 14.8 < z < 22.7. The instrument consists of a single broadband sub-wavelength size antenna and a sampling system for real-time data processing and recording. Preliminary observations were completed in 2013 June at Isla Guadalupe, a Mexican biosphere reserve located in the Pacific Ocean. The data was cleaned to excise channels contaminated by radio frequency interference, and the system response was calibrated by comparing the measured brightness temperature to the Global Sky Model of the Galaxy and by independent measurement of Johnson noise from a calibration terminator. We present our results, discuss the cosmological implications, and describe plans for future work.
Authors:
; ;  [1] ; ;  [2]
  1. McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh, PA 15213 (United States)
  2. Instituto Nacional de Astrofísica, Optica y Electrónica (INAOE), Coordinación de Astrofísica, Luis Enrique Erro No. 1 Sta. Ma. Tonantzintla, Puebla, 72840 Mexico (Mexico)
Publication Date:
OSTI Identifier:
22363995
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 782; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANTENNAS; BRIGHTNESS; CALIBRATION; COMPARATIVE EVALUATIONS; COSMOLOGY; DATA PROCESSING; GALAXIES; INTERFERENCE; NOISE; PROBES; RADIOWAVE RADIATION; RED SHIFT; SKY; STARS