Corpus ID: 236777059

Searching for the hydrogen 21 cm line in cosmos

  title={Searching for the hydrogen 21 cm line in cosmos},
  author={M. Moazzenzadeh and J. T. Firouzjaee},
It is widely agreed that studying the 21 cm emission line from neutral hydrogen may be our best hope for understanding the creation of the first structures during the dark ages and the Epoch of Reionization (EoR). This hyperfine transition occurs as a result of the spin-spin interaction between the electron and the proton in hydrogen: The energy of the parallel spins (triplet) state is greater than that of the anti-parallel spins (singlet). This transition is strongly banned, with a transition… Expand


The Distribution of Radio Brightness over the Solar Disk at a Wavelength of 21 Centimetres. III. The Quiet Sun-Two-Dimensional Observations
Daily records of one-dimensional distribution of radio brightness over the Sun are obtained in the way described in Part I of this series (Christiansen and Warburton 1953). When superimposed, theseExpand
Solar Radio-Frequency Radiation of Thermal Origin
Observations of solar radiation in the wavelength range from one centimetre to four metres are studied in relation to expected thermal radiation. The data are derived partly from published and partlyExpand
LOFAR - low frequency array
In dit artikel zullen the authors LOFAR beschrijven: van de astronomische mogelijkheden met de nieuwe telescoop tot aan een nadere technische beshrijving of het instrument. Expand
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