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SARAS 2 constraints on global 21-cm signals from the Epoch of Reionization
Saurabh Singh, Ravi Subrahmanyan, N. Udaya Shankar +8
Spectral distortions in the cosmic microwave background over the 40--200~MHz band are imprinted by neutral hydrogen in the intergalactic medium prior to the end of reionization. Th…
SARAS 2: A Spectral Radiometer for probing Cosmic Dawn and the Epoch of Reionization through detection of the global 21 cm signal
Saurabh Singh, Ravi Subrahmanyan, N. Udaya Shankar +5
The global 21 cm signal from Cosmic Dawn (CD) and the Epoch of Reionization (EoR), at redshifts , probes the nature of first sources of radiation as well as physics of…
What Are "X-Shaped" Radio Sources Telling Us? I. Very Large Array Imaging of a Large Sample of Low Axial Ratio Radio Sources
David H. Roberts, Lakshmi Saripalli, Kevin X. Wang +5
We present historical VLA and Jansky Very Large Array multi-frequency multi-array radio continuum imaging of a unique sample of 100 radio sources that have been selected on the bas…
Relativistic inverse Compton scattering of photons from the early universe
Siddharth Malu, Abhirup Datta, Sergio Colafrancesco +4
Electrons at relativistic speeds, diffusing in magnetic fields, cause copious emission at radio frequencies in both clusters of galaxies and radio galaxies, through the non-thermal…
First results on the Epoch of Reionization from First Light with SARAS 2
Saurabh Singh, Ravi Subrahmanyan, N. Udaya Shankar +8
Long wavelength spectral distortions in the Cosmic Microwave Background arising from the 21-cm transition in neutral Hydrogen are a key probe of Cosmic Dawn and the Epoch of Reioni…
Spectral energy distribution and radio halo of NGC 253 at low radio frequencies
A. D. Kapinska, L. Staveley-Smith, R. Crocker +67
We present new radio continuum observations of NGC253 from the Murchison Widefield Array at frequencies between 76 and 227 MHz. We model the broadband radio spectral energy distrib…