Observations of the redshifted 21-cm hyperfine line of neutral hydrogen from early phases of
the Universe such as Cosmic Dawn and the Epoch of Reionization promise to open a new …

The redshifted 21 cm brightness distribution from neutral hydrogen is a promising probe into
the cosmic dark ages, cosmic dawn and re-ionization. Low Frequency Array's (LOFAR) Low …

Long-wavelength spectral distortions in the cosmic microwave background arising from the
21 cm transition in neutral hydrogen are a key probe of the Cosmic Dawn and the Epoch of …

ABSTRACT A new upper limit on the 21 cm signal power spectrum at a redshift of z≈ 9.1 is
presented, based on 141 h of data obtained with the Low-Frequency Array (LOFAR). The …

The 21 cm transition of neutral hydrogen is opening an observational window into the
Cosmic Dawn of the universe—the epoch of first star formation. We use 28 hr of data from …

Observations of the redshifted 21-cm line of atomic hydrogen have provided several upper
limits on the 21-cm power spectrum and a tentative detection of the sky-averaged signal at …

The redshifted 21cm line signal from neutral hydrogens is a promising tool to probe the
cosmic dawn and the epoch of reionization. Ongoing and future low-frequency radio …

The recent tentative detection by the Experiment to Detect the Global EoR Signature
(EDGES) low band of the hydrogen 21-cm line from cosmic dawn, if confirmed, is the first …

Observations of the frequency dependence of the global brightness temperature of the
redshifted 21 cm line of neutral hydrogen may be possible with single dipole experiments. In …

We present a survey of the radio sky accessible from the first station of the Long Wavelength
Array. Images are presented at nine frequencies between 35 and 80 MHz with spatial …