184 citations · 1k across the 22 of their papers we have counts for
9 papers · 1 filter
A demonstration of the effect of fringe-rate filtering in the Hydrogen Epoch of Reionization Array delay power spectrum pipeline
Hugh Garsden, Philip Bull, Mike Wilensky +94
Radio interferometers targeting the 21cm brightness temperature fluctuations at high redshift are subject to systematic effects that operate over a range of different timescales. T…
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…
A 21-cm power spectrum at 48 MHz, using the Owens Valley Long Wavelength Array
Hugh Garsden, Lincoln Greenhill, Gianni Bernardi +6
The Large-aperture Experiment to detect the Dark Age (LEDA) was designed to measure the 21-cm signal from neutral hydrogen at Cosmic Dawn, 15-30. Using observations mad…
Patterns of primary beam non-redundancy in close-packed 21 cm array observations
Samir Choudhuri, Philip Bull, Hugh Garsden
Radio interferometer arrays such as HERA consist of many close-packed dishes arranged in a regular pattern, giving rise to a large number of `redundant' baselines with the same len…
The 21 cm Power Spectrum from the Cosmic Dawn: First Results from the OVRO-LWA
Michael W. Eastwood, Marin M. Anderson, Ryan M. Monroe +11
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 th…
Gravitational Microlensing of a Reverberating Quasar Broad Line Region - I. Method and Qualitative Results
H. Garsden, N. F. Bate, G. F. Lewis
The kinematics and morphology of the broad emission line region (BELR) of quasars are the subject of significant debate. The two leading methods for constraining BELR properties ar…
Gravitational Microlensing as a probe of the Electron Scattering Region in Q2237+0305
D. J. Kedziora, H. Garsden, G. F. Lewis
Recent observations have provided strong evidence for the presence of an Electron Scattering Region (ESR) within the central regions of AGNs. This is responsible for reprocessing e…
The Water Maser in MG 0414+0534: The Influence of Gravitational Microlensing
Hugh Garsden, Geraint Lewis, Lisa Harvey-Smith
Water masers have been observed in several high redshift active galactic nuclei, including the gravitationally lensed quasar MG 0414+0534. This quasar is lensed into four images, a…
Gravitational Microlensing: A parallel, large-data implementation
Hugh Garsden, Geraint F. Lewis
Gravitational lensing allows us to probe the structure of matter on a broad range of astronomical scales, and as light from a distant source traverses an intervening galaxy, compac…