200 citations · 1.3k across the 24 of their papers we have counts for
24 papers
Flux Calibration of CHIME/FRB Intensity Data
Bridget C. Andersen, Chitrang Patel, Charanjot Brar +11
Fast radio bursts (FRBs) are bright radio transients of micro-to-millisecond duration and unknown extragalactic origin. Central to the mystery of FRBs are their extremely high char…
STARFIRE: An algorithm for estimating radio frequency interference in orbits around Earth
Sonia Ghosh, Mayuri Sathyanarayana Rao, Saurabh Singh
Ground-based 21-cm experiments targeting the global signal from the periods of Cosmic Dawn (CD) and Epoch of Reionization (EoR) are susceptible to adverse effects presented by i) t…
Power-law distribution and scale-invariant structure from the first CHIME/FRB Fast Radio Burst catalog
Zi-Han Wang, Yu Sang, Xue Zhang
We study the statistical property of fast radio bursts (FRBs) based on a selected sample of 190 one-off FRBs in the first CHIME/FRB catalog. Three power law models are used in the…
Synthetic Observations with the Square Kilometre Array (SKA) -- development towards an end-to-end pipeline
Aishrila Mazumder, Abhirup Datta, Mayuri Sathyanarayana Rao +4
Detection of the redshifted 21-cm signal of neutral hydrogen from the Cosmic Dawn and the Epoch of Reionization is one of the final frontiers of modern observational cosmology. The…
Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
The HERA Collaboration, Zara Abdurashidova, Tyrone Adams +92
We report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization…
Detection of Cosmological 21 cm Emission with the Canadian Hydrogen Intensity Mapping Experiment
CHIME Collaboration, Mandana Amiri, Kevin Bandura +30
We present a detection of 21-cm emission from large-scale structure (LSS) between redshift 0.78 and 1.43 made with the Canadian Hydrogen Intensity Mapping Experiment (CHIME). Radio…
Using the Sun to Measure the Primary Beam Response of the Canadian Hydrogen Intensity Mapping Experiment
CHIME Collaboration, Mandana Amiri, Kevin Bandura +27
We present a beam pattern measurement of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) made using the Sun as a calibration source. As CHIME is a pure drift scan instru…
An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment
The CHIME Collaboration, Mandana Amiri, Kevin Bandura +40
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a drift scan radio telescope operating across the 400-800 MHz band. CHIME is located at the Dominion Radio Astrophysic…
On the detection of a cosmic dawn signal in the radio background
Saurabh Singh, Jishnu Nambissan T., Ravi Subrahmanyan +6
The astrophysics of cosmic dawn, when star formation commenced in the first collapsed objects, is predicted to be revealed as spectral and spatial signatures in the cosmic radio ba…
Automated Detection of Antenna Malfunctions in Large-N Interferometers: A Case Study with the Hydrogen Epoch of Reionization Array
Dara Storer, Joshua S. Dillon, Daniel C. Jacobs +75
We present a framework for identifying and flagging malfunctioning antennas in large radio interferometers. We outline two distinct categories of metrics designed to detect outlier…
First Results from HERA Phase I: Upper Limits on the Epoch of Reionization 21 cm Power Spectrum
The HERA Collaboration, Zara Abdurashidova, James E. Aguirre +74
We report upper-limits on the Epoch of Reionization (EoR) 21 cm power spectrum at redshifts 7.9 and 10.4 with 18 nights of data ( hours of integration) from Phase I of the…
Sub-second periodicity in a fast radio burst
FRB Collaboration, Bridget C. Andersen, Kevin Bandura +59
Fast radio bursts (FRBs) are millisecond-duration flashes of radio waves that are visible at distances of billions of light-years. The nature of their progenitors and their emissio…
Validation of the HERA Phase I Epoch of Reionization 21 cm Power Spectrum Software Pipeline
James E. Aguirre, Steven G. Murray, Robert Pascua +73
We describe the validation of the HERA Phase I software pipeline by a series of modular tests, building up to an end-to-end simulation. The philosophy of this approach is to valida…
A Floating Octave Bandwidth Cone-Disc Antenna for Detection of Cosmic Dawn
Agaram Raghunathan, Ravi Subrahmanyan, N. Udaya Shankar +9
The critical component of radio astronomy radiometers built to detect redshifted 21-cm signals from Cosmic Dawn is the antenna element. We describe the design and performance of an…
SARAS 3 CD/EoR Radiometer: Design and Performance of the Receiver
Jishnu Nambissan T., Ravi Subrahmanyan, R. Somashekar +6
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 cosmological models…
SARAS CD/EoR Radiometer: Design and performance of the Digital Correlation Spectrometer
B. S. Girish, K. S. Srivani, Ravi Subrahmanyan +6
In the currently accepted model for cosmic baryon evolution, Cosmic Dawn and the Epoch of Reionization are significant times when first light from the first luminous objects emerge…
Methods of Error Estimation for Delay Power Spectra in Cosmology
Jianrong Tan, Adrian Liu, Nicholas S. Kern +71
Precise measurements of the 21 cm power spectrum are crucial for understanding the physical processes of hydrogen reionization. Currently, this probe is being pursued by low-freque…
DAYENU: A Simple Filter of Smooth Foregrounds for Intensity Mapping Power Spectra
Aaron Ewall-Wice, Nicholas Kern, Joshua S. Dillon +14
We introduce DAYENU, a linear, spectral filter for HI intensity mapping that achieves the desirable foreground mitigation and error minimization properties of inverse co-variance w…
Canada and the SKA from 2020-2030
Kristine Spekkens, Cynthia Chiang, Roland Kothes +57
This white paper submitted for the 2020 Canadian Long-Range Planning process (LRP2020) presents the prospects for Canada and the Square Kilometre Array (SKA) from 2020-2030, focuss…
The redshifted 21-cm signal in the EDGES low-band spectrum
Saurabh Singh, Ravi Subrahmanyan
The EDGES collaboration reported the finding of an unexpectedly deep absorption in the radio background at 78 MHz and interpreted the dip as a first detection of redshifted 21-cm f…
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…
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…
On the detection of global 21-cm signal from Reionization using interferometers
Saurabh Singh, Ravi Subrahmanyan, N. Udaya Shankar +1
Detection of the global redshifted 21-cm signal is an excellent means of deciphering the physical processes during the Dark Ages and subsequent Epoch of Reionization (EoR). However…