Related papers: The HERA-19 Commissioning Array: Direction Depende…

The Role of the Instrumental Response in 21 cm EoR Power Spectrum Gridding Analyses

Reconstruction of the sky brightness measured by radio interferometers is typically achieved through gridding techniques, or histograms in spatial Fourier space. For Epoch of Reionisation (EoR) 21 cm power spectrum measurements, extreme…

Instrumentation and Methods for Astrophysics · Physics 2022-04-22 Nichole Barry , Aman Chokshi

Foreground simulations for the LOFAR - Epoch of Reionization Experiment

Future high redshift 21-cm experiments will suffer from a high degree of contamination, due both to astrophysical foregrounds and to non-astrophysical and instrumental effects. In order to reliably extract the cosmological signal from the…

Astrophysics · Physics 2008-09-23 Vibor Jelic , Saleem Zaroubi , Panagiotis Labropoulos , Rajat M. Thomas , Gianni Bernardi , Michiel A. Brentjens , Ger de Bruyn , Benedetta Ciardi , Geraint Harker , Leon V. E. Koopmans , Vishambhar N. Pandey , Joop Schaye , Sarod Yatawatta

Mitigating Internal Instrument Coupling II: A Method Demonstration with the Hydrogen Epoch of Reionization Array

We present a study of internal reflection and cross coupling systematics in Phase I of the Hydrogen Epoch of Reionization Array (HERA). In a companion paper, we outlined the mathematical formalism for such systematics and presented…

Instrumentation and Methods for Astrophysics · Physics 2020-01-15 Nicholas S. Kern , Aaron R. Parsons , Joshua S. Dillon , Adam E. Lanman , Adrian Liu , Philip Bull , Aaron Ewall-Wice , Zara Abdurashidova , James E. Aguirre , Paul Alexander , Zaki S. Ali , Yanga Balfour , Adam P. Beardsley , Gianni Bernardi , Judd D. Bowman , Richard F. Bradley , Jacob Burba , Chris L. Carilli , Carina Cheng , David R. DeBoer , Matt Dexter , Eloy de Lera Acedo , Nicolas Fagnoni , Randall Fritz , Steve R. Furlanetto , Brian Glendenning , Deepthi Gorthi , Bradley Greig , Jasper Grobbelaar , Ziyaad Halday , Bryna J. Hazelton , Jacqueline N. Hewitt , Jack Hickish , Daniel C. Jacobs , Austin Julius , Joshua Kerrigan , Piyanat Kittiwisit , Saul A. Kohn , Matthew Kolopanis , Paul La Plante , Telalo Lekalake , David MacMahon , Lourence Malan , Cresshim Malgas , Matthys Maree , Zachary E. Martinot , Eunice Matsetela , Andrei Mesinger , Mathakane Molewa , Miguel F. Morales , Tshegofalang Mosiane , Steven G. Murray , Abraham R. Neben , Aaron R. Parsons , Nipanjana Patra , Samantha Pieterse , Jonathan C. Pober , Nima Razavi-Ghods , Jon Ringuette , James Robnett , Kathryn Rosie , Peter Sims , Craig Smith , Angelo Syce , Nithyanandan Thyagarajan , Peter K. G. Williams , Haoxuan Zheng

The Hydrogen Epoch of Reionization Array Dish I: Beam Pattern Measurements and Science Implications

The Hydrogen Epoch of Reionization Array (HERA) is a radio interferometer aiming to detect the power spectrum of 21 cm fluctuations from neutral hydrogen from the Epoch of Reionization (EOR). Drawing on lessons from the Murchison Widefield…

Instrumentation and Methods for Astrophysics · Physics 2016-12-08 Abraham R. Neben , Richard F. Bradley , Jacqueline N. Hewitt , David R. DeBoer , Aaron R. Parsons , James E. Aguirre , Zaki S. Ali , Carina Cheng , Aaron Ewall-Wice , Nipanjana Patra , Nithyanandan Thyagarajan , Judd Bowman , Roger Dickenson , Joshua S. Dillon , Phillip Doolittle , Dennis Egan , Mike Hedrick , Daniel C. Jacobs , Saul A. Kohn , Patricia J. Klima , Kavilan Moodley , Benjamin R. B. Saliwanchik , Patrick Schaffner , John Shelton , H. A. Taylor , Rusty Taylor , Max Tegmark , Butch Wirt , Haoxuan Zheng

Foreground modelling via Gaussian process regression: an application to HERA data

The key challenge in the observation of the redshifted 21-cm signal from cosmic reionization is its separation from the much brighter foreground emission. Such separation relies on the different spectral properties of the two components,…

Cosmology and Nongalactic Astrophysics · Physics 2020-05-20 Abhik Ghosh , Florent Mertens , Gianni Bernardi , Mário G. Santos , Nicholas S. Kern , Christopher L. Carilli , Trienko L. Grobler , Léon V. E. Koopmans , Daniel C. Jacobs , Adrian Liu , Aaron R. Parsons , Miguel F. Morales , James E. Aguirre , Joshua S. Dillon , Bryna J. Hazelton , Oleg M. Smirnov , Bharat K. Gehlot , Siyanda Matika , Paul Alexander , Zaki S. Ali , Adam P. Beardsley , Roshan K. Benefo , Tashalee S. Billings , Judd D. Bowman , Richard F. Bradley , Carina Cheng , Paul M. Chichura , David R. DeBoer , Eloy de Lera Acedo , Aaron Ewall-Wice , Gcobisa Fadana , Nicolas Fagnoni , Austin F. Fortino , Randall Fritz , Steve R. Furlanetto , Samavarti Gallardo , Brian Glendenning , Deepthi Gorthi , Bradley Greig , Jasper Grobbelaar , Jack Hickish , Alec Josaitis , Austin Julius , Amy S. Igarashi , MacCalvin Kariseb , Saul A. Kohn , Matthew Kolopanis , Telalo Lekalake , Anita Loots , David MacMahon , Lourence Malan , Cresshim Malgas , Matthys Maree , Zachary E. Martinot , Nathan Mathison , Eunice Matsetela , Andrei Mesinger , Abraham R. Neben , Bojan Nikolic , Chuneeta D. Nunhokee , Nipanjana Patra , Samantha Pieterse , Nima Razavi-Ghods , Jon Ringuette , James Robnett , Kathryn Rosie , Raddwine Sell , Craig Smith , Angelo Syce , Max Tegmark , Nithyanandan Thyagarajan , Peter K. G. Williams , Haoxuan Zheng

Constraining Polarized Foregrounds for EOR Experiments II: Polarization Leakage Simulations in the Avoidance Scheme

A critical challenge in the observation of the redshifted 21-cm line is its separation from bright Galactic and extragalactic foregrounds. In particular, the instrumental leakage of polarized foregrounds, which undergo significant Faraday…

Cosmology and Nongalactic Astrophysics · Physics 2017-10-18 C. D. Nunhokee , G. Bernardi , S. A. Kohn , J. E. Aguirre , N. Thyagarajan , J. S. Dillon , G. Foster , T. L. Grobler , J. Z. E. Martinot , A. R. Parsons

The GMRT EoR Experiment: Limits on Polarized Sky Brightness at 150 MHz

The GMRT reionization effort aims to map out the large scale structure of the Universe during the epoch of reionization (EoR). Removal of polarized Galactic emission is a difficult part of any 21 cm EoR program, and we present new upper…

Astrophysics · Physics 2014-11-18 Ue-Li Pen , Tzu-Ching Chang , Christopher M. Hirata , Jeffrey B. Peterson , Jayanta Roy , Yashwant Gupta , Julia Odegova , Kris Sigurdson

Initial LOFAR observations of Epoch of Reionization windows: II. Diffuse polarized emission in the ELAIS-N1 field

This study aims to characterise the polarized foreground emission in the ELAIS-N1 field and to address its possible implications for the extraction of the cosmological 21-cm signal from the Low-Frequency Array - Epoch of Reionization…

Astrophysics of Galaxies · Physics 2014-09-05 V. Jelic , A. G. de Bruyn , M. Mevius , F. B. Abdalla , K. M. B. Asad , G. Bernardi , M. A. Brentjens , S. Bus , E. Chapman , B. Ciardi , S. Daiboo , E. R. Fernandez , A. Ghosh , G. Harker , H. Jensen , S. Kazemi , L. V. E. Koopmans , P. Labropoulos , O. Martinez-Rubi , G. Mellema , A. R. Offringa , V. N. Pandey , A. H. Patil , R. M. Thomas , H. K. Vedantham , V. Veligatla , S. Yatawatta , S. Zaroubi , A. Alexov , J. Anderson , I. M. Avruch , R. Beck , M. E. Bell , M. J. Bentum , P. Best , A. Bonafede , J. Bregman , F. Breitling , J. Broderick , W. N. Brouw , M. Bruggen , H. R. Butcher , J. E. Conway , F. de Gasperin , E. de Geus , A. Deller , R. -J. Dettmar , S. Duscha , J. Eisloffel , D. Engels , H. Falcke , R. A. Fallows , R. Fender , C. Ferrari , W. Frieswijk , M. A. Garrett , J. Griessmeier , A. W. Gunst , J. P. Hamaker , T. E. Hassall , M. Haverkorn , G. Heald , J. W. T. Hessels , M. Hoeft , J. Horandel , A. Horneffer , A. van der Horst , M. Iacobelli , E. Juette , A. Karastergiou , V. I. Kondratiev , M. Kramer , M. Kuniyoshi , G. Kuper , J. van Leeuwen , P. Maat , G. Mann , D. McKay-Bukowski , J. P. McKean , H. Munk , A. Nelles , M. J. Norden , H. Paas , M. Pandey-Pommier , G. Pietka , R. Pizzo , A. G. Polatidis , W. Reich , H. Rottgering , A. Rowlinson , A. M. M. Scaife , D. Schwarz , M. Serylak , O. Smirnov , M. Steinmetz , A. Stewart , M. Tagger , Y. Tang , C. Tasse , S. ter Veen , S. Thoudam , C. Toribio , R. Vermeulen , C. Vocks , R. J. van Weeren , R. A. M. J. Wijers , S. J. Wijnholds , O. Wucknitz , P. Zarka

Delay Spectrum with Phase-Tracking Arrays: Extracting the HI power spectrum from the Epoch of Reionization

The Detection of redshifted 21 cm emission from the epoch of reionization (EoR) is a challenging task owing to strong foregrounds that dominate the signal. In this paper, we propose a general method, based on the delay spectrum approach, to…

Cosmology and Nongalactic Astrophysics · Physics 2016-12-21 Sourabh Paul , Shiv K. Sethi , Miguel F. Morales , K. S. Dwarkanath , N. Udaya Shankar , Ravi Subrahmanyan , N. Barry , A. P. Beardsley , Judd D. Bowman , F. Briggs , P. Carroll , A. de Oliveira-Costa , Joshua S. Dillon , A. Ewall-Wice , L. Feng , L. J. Greenhill , B. M. Gaensler , B. J. Hazelton , J. N. Hewitt , N. Hurley-Walker , D. J. Jacobs , Han-Seek Kim , P. Kittiwisit , E. Lenc , J. Line , A. Loeb , B. McKinley , D. A. Mitchell , A. R. Neben , A. R. Offringa , B. Pindor , J. C. Pober , P. Procopio , J. Riding , I. S. Sullivan , M. Tegmark , Nithyanandan Thyagarajan , S. J. Tingay , C. M. Trott , R. B. Wayth , R. L. Webster , J. S. B. Wyithe , Roger Cappallo , M. Johnston-Hollitt , D. L. Kaplan , C. J. Lonsdale , S. R. McWhirter , E. Morgan , D. Oberoi , S. M. Ord , T. Prabu , K. S. Srivani , A. Williams , C. L. Williams

The Necessity of Individually Validated Beam Models for an Interferometric Epoch of Reionization Detection

A first statistical detection of the 21-cm Epoch of Reionization (EoR) is on the horizon, as cosmological volumes of the Universe become accessible via the adoption of low-frequency interferometers. We explore the impact which non-identical…

Cosmology and Nongalactic Astrophysics · Physics 2024-10-01 A. Chokshi , N. Barry , J. L. B. Line , C. H. Jordan , B. Pindor , R. L. Webster

Unbiased constraints on reionization model parameters in presence of the foreground wedge

A possible way to disentangle the redshifted 21 cm signal of neutral hydrogen (HI) in the Epoch of Reionization (EoR) from the much larger astrophysical foregrounds is to restrict the analysis to a wedge-shaped region in the Fourier space.…

Cosmology and Nongalactic Astrophysics · Physics 2018-06-25 Dinesh Raut , Tirthankar Roy Choudhury

Absolute Calibration Strategies for the Hydrogen Epoch of Reionization Array and Their Impact on the 21 cm Power Spectrum

We discuss absolute calibration strategies for Phase I of the Hydrogen Epoch of Reionization Array (HERA), which aims to measure the cosmological 21 cm signal from the Epoch of Reionization (EoR). HERA is a drift-scan array with a 10 degree…

Instrumentation and Methods for Astrophysics · Physics 2020-02-26 Nicholas S. Kern , Joshua S. Dillon , Aaron R. Parsons , Christopher L. Carilli , Gianni Bernardi , Zara Abdurashidova , James E. Aguirre , Paul Alexander , Zaki S. Ali , Yanga Balfour , Adam P. Beardsley , Tashalee S. Billings , Judd D. Bowman , Richard F. Bradley , Philip Bull , Jacob Burba , Steven Carey , Carina Cheng , David R. DeBoer , Matt Dexter , Eloy de Lera Acedo , John Ely , Aaron Ewall-Wice , Nicolas Fagnoni , Randall Fritz , Steve R. Furlanetto , Kingsley Gale-Sides , Brian Glendenning , Deepthi Gorthi , Bradley Greig , Jasper Grobbelaar , Ziyaad Halday , Bryna J. Hazelton , Jacqueline N. Hewitt , Jack Hickish , Daniel C. Jacobs , Austin Julius , Joshua Kerrigan , Piyanat Kittiwisit , Saul A. Kohn , Matthew Kolopanis , Adam Lanman , Paul La Plante , Telalo Lekalake , Adrian Liu , David MacMahon , Lourence Malan , Cresshim Malgas , Matthys Maree , Zachary E. Martinot , Eunice Matsetela , Andrei Mesinger , Mathakane Molewa , Miguel F. Morales , Tshegofalang Mosiane , Steven G. Murray , Abraham R. Neben , Bojan Nikolic , Chuneeta D. Nunhokee , Nipanjana Patra , Samantha Pieterse , Jonathan C. Pober , Nima Razavi-Ghods , Jon Ringuette , James Robnett , Kathryn Rosie , Peter Sims , Craig Smith , Angelo Syce , Nithyanandan Thyagarajan , Peter K. G. Williams , Haoxuan Zheng

Multi-redshift limits on the 21cm power spectrum from PAPER

The epoch of reionization power spectrum is expected to evolve strongly with redshift, and it is this variation with cosmic history that will allow us to begin to place constraints on the physics of reionization. The primary obstacle to the…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-22 Daniel C. Jacobs , Jonathan C. Pober , Aaron R. Parsons , James E. Aguirre , Zaki Ali , Judd Bowman , Richard F. Bradley , Chris L. Carilli , David R. DeBoer , Matthew R. Dexter , Nicole E. Gugliucci , Pat Klima , Adrian Liu , Dave H. E. MacMahon , Jason R. Manley , David F. Moore , Irina I. Stefan , William P. Walbrugh

Opening the 21cm EoR Window: Measurements of Foreground Isolation with PAPER

We present new observations with the Precision Array for Probing the Epoch of Reionization (PAPER) with the aim of measuring the properties of foreground emission for 21cm Epoch of Reionization experiments at 150 MHz. We focus on the…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 Jonathan C. Pober , Aaron R. Parsons , James E. Aguirre , Zaki Ali , Richard F. Bradley , Chris L. Carilli , Dave DeBoer , Matthew Dexter , Nicole E. Gugliucci , Daniel C. Jacobs , Patricia J. Klima , Dave MacMahon , Jason Manley , David F. Moore , Irina I. Stefan , William P. Walbrugh

Power spectrum extraction for redshifted 21-cm epoch of reionization experiments: the LOFAR case

One of the aims of the Low Frequency Array (LOFAR) Epoch of Reionization (EoR) project is to measure the power spectrum of variations in the intensity of redshifted 21-cm radiation from the EoR. The sensitivity with which this power…

Cosmology and Nongalactic Astrophysics · Physics 2010-08-20 Geraint Harker , Saleem Zaroubi , Gianni Bernardi , Michiel A. Brentjens , A. G. de Bruyn , Benedetta Ciardi , Vibor Jelic , Leon V. E. Koopmans , Panagiotis Labropoulos , Garrelt Mellema , Andre Offringa , V. N. Pandey , Andreas H. Pawlik , Joop Schaye , Rajat M. Thomas , Sarod Yatawatta

Parametrising Epoch of Reionization foregrounds: A deep survey of low-frequency point-source spectra with the MWA

Experiments that pursue detection of signals from the Epoch of Reionization (EoR) are relying on spectral smoothness of source spectra at low frequencies. This article empirically explores the effect of foreground spectra on EoR experiments…

Instrumentation and Methods for Astrophysics · Physics 2016-02-17 A. R. Offringa , C. M. Trott , N. Hurley-Walker , M. Johnston-Hollitt , B. McKinley , N. Barry , A. P. Beardsley , J. D. Bowman , F. Briggs , P. Carroll , J. S. Dillon , A. Ewall-Wice , L. Feng , B. M. Gaensler , L. J. Greenhill , B. J. Hazelton , J. N. Hewitt , D. C. Jacobs , H. -S. Kim , P. Kittiwisit , E. Lenc , J. Line , A. Loeb , D. A. Mitchell , M. F. Morales , A. R. Neben , S. Paul , B. Pindor , J. C. Pober , P. Procopio , J. Riding , S. K. Sethi , N. U. Shankar , R. Subrahmanyan , I. S. Sullivan , M. Tegmark , N. Thyagarajan , S. J. Tingay , R. B. Wayth , R. L. Webster , J. S. B. Wyithe

The Epoch of Reionization Window: II. Statistical Methods for Foreground Wedge Reduction

For there to be a successful measurement of the 21 cm Epoch of Reionization (EoR) power spectrum, it is crucial that strong foreground contaminants be robustly suppressed. These foregrounds come from a variety of sources (such as Galactic…

Cosmology and Nongalactic Astrophysics · Physics 2014-07-25 Adrian Liu , Aaron R. Parsons , Cathryn M. Trott

First Results from HERA Phase I: Upper Limits on the Epoch of Reionization 21 cm Power Spectrum

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 ($\sim36$ hours of integration) from Phase I of the Hydrogen Epoch of Reionization Array (HERA). The Phase I…

Cosmology and Nongalactic Astrophysics · Physics 2022-03-02 The HERA Collaboration , Zara Abdurashidova , James E. Aguirre , Paul Alexander , Zaki S. Ali , Yanga Balfour , Adam P. Beardsley , Gianni Bernardi , Tashalee S. Billings , Judd D. Bowman , Richard F. Bradley , Philip Bull , Jacob Burba , Steve Carey , Chris L. Carilli , Carina Cheng , David R. DeBoer , Matt Dexter , Eloy de Lera Acedo , Taylor Dibblee-Barkman , Joshua S. Dillon , John Ely , Aaron Ewall-Wice , Nicolas Fagnoni , Randall Fritz , Steven R. Furlanetto , Kingsley Gale-Sides , Brian Glendenning , Deepthi Gorthi , Bradley Greig , Jasper Grobbelaar , Ziyaad Halday , Bryna J. Hazelton , Jacqueline N. Hewitt , Jack Hickish , Daniel C. Jacobs , Austin Julius , Nicholas S. Kern , Joshua Kerrigan , Piyanat Kittiwisit , Saul A. Kohn , Matthew Kolopanis , Adam Lanman , Paul La Plante , Telalo Lekalake , David Lewis , Adrian Liu , David MacMahon , Lourence Malan , Cresshim Malgas , Matthys Maree , Zachary E. Martinot , Eunice Matsetela , Andrei Mesinger , Mathakane Molewa , Miguel F. Morales , Tshegofalang Mosiane , Steven G. Murray , Abraham R. Neben , Bojan Nikolic , Chuneeta D. Nunhokee , Aaron R. Parsons , Nipanjana Patra , Robert Pascua , Samantha Pieterse , Jonathan C. Pober , Nima Razavi-Ghods , Jon Ringuette , James Robnett , Kathryn Rosie , Peter Sims , Saurabh Singh , Craig Smith , Angelo Syce , Nithyanandan Thyagarajan , Peter K. G. Williams , Haoxuan Zheng

New Limits on Polarized Power Spectra at 126 and 164 MHz: Relevance to Epoch of Reionization Measurements

Polarized foreground emission is a potential contaminant of attempts to measure the fluctuation power spectrum of highly redshifted 21 cm HI emission from the epoch of reionization. Using the Donald C. Backer Precision Array for Probing the…

Cosmology and Nongalactic Astrophysics · Physics 2018-03-06 David Moore , James E. Aguirre , Saul Kohn , Aaron Parsons , Zaki Ali , Richard Bradley , Chris Carilli , David DeBoer , Matthew Dexter , Nicole Gugliucci , Daniel Jacobs , Pat Klima , Adrian Liu , David MacMahon , Jason Manley , Jonathan Pober , Irina Stefan , William Walbrugh

Estimating the Feasibility of 21cm-Ly$\alpha$ Synergies using the Hydrogen Epoch of Reionization Array

Cross-correlating 21cm and Ly$\alpha$ intensity maps of the Epoch of Reionization (EoR) promises to be a powerful tool for exploring the properties of the first galaxies. Next-generation intensity mapping experiments such as the Hydrogen…

Cosmology and Nongalactic Astrophysics · Physics 2022-03-02 Tyler A. Cox , Daniel C. Jacobs , Steven G. Murray