Search Results - "RAVI SUBRAHMANYAN"

On the detection of a cosmic dawn signal in the radio background by Singh, Saurabh, Nambissan T., Jishnu, Subrahmanyan, Ravi, Udaya Shankar, N., Girish, B. S., Raghunathan, A., Somashekar, R., Srivani, K. S., Sathyanarayana Rao, Mayuri

“…The astrophysics of the cosmic dawn, when star formation commenced in the first collapsed objects, is predicted to be revealed by spectral and spatial…”
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SARAS 2 Constraints on Global 21 cm Signals from the Epoch of Reionization by Singh, Saurabh, Subrahmanyan, Ravi, Shankar, N. Udaya, Rao, Mayuri Sathyanarayana, Fialkov, Anastasia, Cohen, Aviad, Barkana, Rennan, Girish, B. S., Raghunathan, A., Somashekar, R., Srivani, K. S.

“…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…”
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SARAS 3 CD/EoR radiometer: design and performance of the receiver by T., Jishnu Nambissan, Subrahmanyan, Ravi, Somashekar, R., Shankar, N. Udaya, Singh, Saurabh, Raghunathan, A., Girish, B. S., Srivani, K. S., Rao, Mayuri Sathyanarayana

“…SARAS is an ongoing experiment aiming to detect the redshifted global 21-cm signal expected from Cosmic Dawn (CD) and the Epoch of Reionization (EoR). Standard…”
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SARAS: a precision system for measurement of the cosmic radio background and signatures from the epoch of reionization by Patra, Nipanjana, Subrahmanyan, Ravi, Raghunathan, A., Udaya Shankar, N.

“…SARAS is a correlation spectrometer purpose designed for precision measurements of the cosmic radio background and faint features in the sky spectrum at long…”
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The Redshifted 21 cm Signal in the EDGES Low-band Spectrum by Singh, Saurabh, Subrahmanyan, Ravi

“…The EDGES collaboration reported an unexpectedly deep absorption in the radio background at 78 MHz and interpreted the dip as the first detection of a…”
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Peering into the dark (ages) with low-frequency space interferometers by Koopmans Léon V E, Barkana Rennan, Bentum, Mark, Bernardi Gianni, Albert-Jan, Boonstra, Bowman, Judd, Burns, Jack, Chen, Xuelei, Datta Abhirup, Falcke Heino, Fialkov Anastasia, Gehlot Bharat, Gurvits Leonid, Jelić Vibor, Klein-Wolt, Marc, Lazio, Joseph, Meerburg Daan, Mellema Garrelt, Mertens Florent, Mesinger Andrei, Offringa André, Pritchard, Jonathan, Semelin Benoit, Subrahmanyan Ravi, Silk, Joseph, Trott Cathryn, Vedantham Harish, Verde Licia, Zaroubi Saleem, Zarka, Philippe

“…The Dark Ages and Cosmic Dawn are largely unexplored windows on the infant Universe (z ~ 200–10). Observations of the redshifted 21-cm line of neutral hydrogen…”
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Modulations in the radio light curve of the Type IIb supernova 2001ig: evidence for a Wolf–Rayet binary progenitor? by Ryder, Stuart D., Sadler, Elaine M., Subrahmanyan, Ravi, Weiler, Kurt W., Panagia, Nino, Stockdale, Christopher

“…We describe the radio evolution of supernova (SN) 2001ig in NGC 7424, from 700 d of multifrequency monitoring with the Australia Telescope Compact Array (ATCA)…”
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IS THERE AN UNACCOUNTED FOR EXCESS IN THE EXTRAGALACTIC COSMIC RADIO BACKGROUND? by Subrahmanyan, Ravi, Cowsik, Ramanath

“…Analyses of the distribution of absolute brightness temperature over the radio sky have recently led to suggestions that there exists a substantial unexplained…”
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Extragalactic sources towards the central region of the Galaxy by Roy, Subhashis, Rao, A. Pramesh, Subrahmanyan, Ravi

“…We have observed a sample of 64 small-diameter sources towards the central −6° < l < 6°, −2° < b < 2° of the Galaxy with the aim of studying the Faraday…”
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Can anyone own the sky? by Subrahmanyan, Ravi

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Renewed Activity in the Radio Galaxy PKS B1545–321: Twin Edge-brightened Beams within Diffuse Radio Lobes by Saripalli, Lakshmi, Subrahmanyan, Ravi, Udaya Shankar, N

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The temperature of the warm neutral medium in the Milky Way by Kanekar, Nissim, Subrahmanyan, Ravi, Chengalur, Jayaram N, Safouris, Vicky

“…We report high-spectral-resolution Australia Telescope Compact Array (ATCA) H i 21-cm observations resulting in the detection of the warm neutral medium (WNM)…”
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Mind the gap: reflections on the art of science by Subrahmanyan, Ravi

“…Scientific research in India has for too long been conducted at a distance from the public, within gated communities of select and chosen few. Fundamental…”
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First results from the Australia Telescope Compact Array 18‐GHz pilot survey by Ricci, Roberto, Sadler, Elaine M., Ekers, Ronald D., Staveley–Smith, Lister, Wilson, Warwick E., Kesteven, Michael J., Subrahmanyan, Ravi, Walker, Mark A., Jackson, Carole A., De Zotti, Gianfranco

“…ABSTRACT As a pilot study for the first all‐sky radio survey at short wavelengths, we have observed 1216 deg2 of the southern sky at 18 GHz (16 mm) using a…”
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IMAGING THE EPOCH OF REIONIZATION: LIMITATIONS FROM FOREGROUND CONFUSION AND IMAGING ALGORITHMS by Vedantham, Harish, Udaya Shankar, N., Subrahmanyan, Ravi

“…Tomography of redshifted 21 cm transition from neutral hydrogen using Fourier synthesis telescopes is a promising tool to study the Epoch of Reionization…”
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The Genesis of Morphologies in Extended Radio Sources: X-Shapes, Off-Axis Distortions, and Giant Radio Sources by Saripalli, Lakshmi, Subrahmanyan, Ravi

“…We examine relationships between the morphology in double radio sources and the radio-optical position angle offset-the relative orientation of the radio axis…”
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IMAGING THE EPOCH OF REIONIZATION: LIMITATIONS FROM FOREGROUND CONFUSION AND IMAGING ALGORITHMS by VEDANTHAM, Harish, UDAYA SHANKAR, N, SUBRAHMANYAN, Ravi

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The Australia telescope 20 GHz survey: hardware, observing strategy, and scanning survey catalog by Hancock, Paul Jacob, Roberts, Paul, Kesteven, Michael J., Ekers, Ronald D., Sadler, Elaine M., Murphy, Tara, Massardi, Marcella, Ricci, Roberto, Calabretta, Mark, de Zotti, Gianfranco, Edwards, Philip G., Ekers, Jennifer A., Jackson, Carole A., Leach, Mark, Phillips, Chris, Sault, Robert J., Staveley-Smith, Lister, Subrahmanyan, Ravi, Walker, Mark A., Wilson, Warwick E.

“…The Australia Telescope 20 GHz (AT20G) survey is a large area (2 π sr), sensitive (40 mJy), high frequency (20 GHz) survey of the southern sky. The survey was…”
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Awakening to the Cosmic Dawn by Subrahmanyan, Ravi

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Modeling the Radio Foreground for Detection of CMB Spectral Distortions from the Cosmic Dawn and the Epoch of Reionization by Sathyanarayana Rao, Mayuri, Subrahmanyan, Ravi, Shankar, N Udaya, Chluba, Jens

“…Cosmic baryon evolution during the Cosmic Dawn and Reionization results in redshifted 21-cm spectral distortions in the cosmic microwave background (CMB)…”
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