Related papers: Extracting the 21 cm EoR signal using MWA drift sc…

A simulation calibrated limit on the HI power spectrum from the GMRT Epoch of Reionization experiment

The GMRT Epoch of Reionization (EoR) experiment is an ongoing effort to measure the power spectrum from neutral hydrogen at high redshift. We have previously reported an upper limit of (70 mK)^2 at wavenumbers of k=0.65 h/Mpc using a basic…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 Gregory Paciga , Joshua G. Albert , Kevin Bandura , Tzu-Ching Chang , Yashwant Gupta , Christopher Hirata , Julia Odegova , Ue-Li Pen , Jeffrey B. Peterson , Jayanta Roy , Richard Shaw , Kris Sigurdson , Tabitha Voytek

Measuring the EoR Power Spectrum Without Measuring the EoR Power Spectrum

The large-scale structure of the Universe should soon be measured at high redshift during the Epoch of Reionization (EoR) through line-intensity mapping. A number of ongoing and planned surveys are using the 21 cm line to trace neutral…

Cosmology and Nongalactic Astrophysics · Physics 2019-05-01 Angus Beane , Francisco Villaescusa-Navarro , Adam Lidz

The EoR Sensitivity of the Murchison Widefield Array

Using the final 128 antenna locations of the Murchison Widefield Array (MWA), we calculate its sensitivity to the Epoch of Reionization (EoR) power spectrum of red- shifted 21 cm emission for a fiducial model and provide the tools to…

Instrumentation and Methods for Astrophysics · Physics 2015-06-04 A. P. Beardsley , B. J. Hazelton , M. F. Morales , W. Arcus , D. Barnes , G. Bernardi , J. D. Bowman , F. H. Briggs , J. D. Bunton , R. J. Cappallo , B. E. Corey , A. Deshpande , L. deSouza , D. Emrich , B. M. Gaensler , R. Goeke , L. J. Greenhill , D. Herne , J. N. Hewitt , M. Johnston-Hollitt , D. L. Kaplan , J. C. Kasper , B. B. Kincaid , R. Koenig , E. Kratzenberg , C. J. Lonsdale , M. J. Lynch , S. R. McWhirter , D. A. Mitchell , E. Morgan , D. Oberoi , S. M. Ord , J. Pathikulangara , T. Prabu , R. A. Remillard , A. E. E. Rogers , A. Roshi , J. E. Salah , R. J. Sault , N. Udaya Shankar , K. S. Srivani , J. Stevens , R. Subrahmanyan , S. J. Tingay , R. B. Wayth , M. Waterson , R. L. Webster , A. R. Whitney , A. Williams , C. L. Williams , J. S. B. Wyithe

Assessment of ionospheric activity tolerances for Epoch of Reionisation science with the Murchison Widefield Array

Structure imprinted in foreground extragalactic point sources by ionospheric refraction has the potential to contaminate Epoch of Reionisation (EoR) power spectra of the 21~cm emission line of neutral hydrogen. The alteration of the spatial…

Instrumentation and Methods for Astrophysics · Physics 2018-09-20 Cathryn M. Trott , C. H. Jordan , S. G. Murray , B. Pindor , D. A. Mitchell , R. B. Wayth , J. Line , B. McKinley , A. Beardsley , J. Bowman , F. Briggs , B. J. Hazelton , J. Hewitt , D. Jacobs , M. F. Morales , J. C. Pober , S. Sethi , U. Shankar , R. Subrahmanyan , M. Tegmark , S. J. Tingay , R. L. Webster , J. S. B. Wyithe

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

Strategy for mitigation of systematics for EoR experiments with the Murchison Widefield Array

Observations of the 21 cm signal face significant challenges due to bright astrophysical foregrounds that are several orders of magnitude higher than the brightness of the hydrogen line, along with various systematics. Successful 21 cm…

Cosmology and Nongalactic Astrophysics · Physics 2024-12-11 Chuneeta D. Nunhokee , Dev Null , Cathryn M. Trott , Christopher H. Jordan , Jack B. Line , Randall Wayth , Nichole Barry

A new MWA limit on the 21 cm Power Spectrum at Redshifts $\sim$ 13 $-$ 17

Observations in the lowest MWA band between $75-100$ MHz have the potential to constrain the distribution of neutral hydrogen in the intergalactic medium at redshift $\sim 13-17$. Using 15 hours of MWA data, we analyse systematics in this…

Cosmology and Nongalactic Astrophysics · Physics 2021-07-07 S. Yoshiura , B. Pindor , J. L. B. Line , N. Barry , C. M. Trott , A. Beardsley , J. Bowman , R. Byrne , A. Chokshi , B. J. Hazelton , K. Hasegawa , E. Howard , B. Greig , D. Jacobs , C. H. Jordan , R. Joseph , M. Kolopanis , C. Lynch , B. McKinley , D. A. Mitchell , M. F. Morales , S. G. Murray , J. C. Pober , M. Rahimi , K. Takahashi , S. J. Tingay , R. B. Wayth , R. L. Webster , M. Wilensky , J. S. B. Wyithe , Z. Zhang , Q. Zheng

The Epoch of Reionization 21 cm Bispectrum at $z=8.2$ from MWA data II: Smooth Component Filtering

The 21 cm bispectrum (BS) offers a powerful probe of the Epoch of Reionization (EoR), but its observational access is severely hindered by dominant astrophysical foregrounds. Considering Murchison Widefield Array (MWA) observations at…

Cosmology and Nongalactic Astrophysics · Physics 2026-02-20 Sukhdeep Singh Gill , Khandakar Md Asif Elahi , Somnath Bharadwaj , Shiv K. Sethi , Akash Kumar Patwa

Evidence of Ultra-faint Radio Frequency Interference in Deep 21~cm Epoch of Reionization Power Spectra with the Murchison Widefield Array

We present deep upper limits from the 2014 Murchison Widefield Array (MWA) Phase I observing season, with a particular emphasis on identifying the spectral fingerprints of extremely faint radio frequency interference (RFI) contamination in…

Cosmology and Nongalactic Astrophysics · Physics 2025-04-29 Michael J. Wilensky , Miguel F. Morales , Bryna J. Hazelton , Pyxie L. Star , Nichole Barry , Ruby Byrne , C. H. Jordan , Daniel C. Jacobs , Jonathan C. Pober , C. M. Trott

First Limits on the 21 cm Power Spectrum during the Epoch of X-ray heating

We present first results from radio observations with the Murchison Widefield Array seeking to constrain the power spectrum of 21 cm brightness temperature fluctuations between the redshifts of 11.6 and 17.9 (113 and 75 MHz). Three hours of…

Cosmology and Nongalactic Astrophysics · Physics 2016-05-25 A. Ewall-Wice , Joshua S. Dillon , J. N. Hewitt , A. Loeb , A. Mesinger , A. R. Neben , A. R. Offringa , M. Tegmark , N. Barry , A. P. Beardsley , G. Bernardi , Judd D. Bowman , F. Briggs , R. J. Cappallo , P. Carroll , B. E. Corey , A. de Oliveira-Costa , D. Emrich , L. Feng , B. M. Gaensler , R. Goeke , L. J. Greenhill , B. J. Hazelton , N. Hurley-Walker , M. Johnston-Hollitt , Daniel C. Jacobs , D. L. Kaplan , J. C. Kasper , HS Kim , E. Kratzenberg , E. Lenc , J Line , C. J. Lonsdale , M. J. Lynch , B. McKinley , S. R. McWhirter , D. A. Mitchell , M. F. Morales , E. Morgan , Nithyanandan Thyagarajan , D. Oberoi , S. M. Ord , S. Paul , B. Pindor , J. C. Pober , T. Prabu , P. Procopio , J. Riding , A. E. E. Rogers , A. Roshi , N. Udaya Shankar , Shiv K. Sethi , K. S. Srivani , R. Subrahmanyan , I. S. Sullivan , S. J. Tingay , C. M. Trott , M. Waterson , R. B. Wayth , R. L. Webster , A. R. Whitney , A. Williams , C. L. Williams , C. Wu , J. S. B. Wyithe

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

Constraining the epoch of reionization with the variance statistic: simulations of the LOFAR case

Several experiments are underway to detect the cosmic redshifted 21-cm signal from neutral hydrogen from the Epoch of Reionization (EoR). Due to their very low signal-to-noise ratio, these observations aim for a statistical detection of the…

Cosmology and Nongalactic Astrophysics · Physics 2014-07-28 Ajinkya H. Patil , Saleem Zaroubi , Emma Chapman , Vibor Jelić , Geraint Harker , Filipe B. Abdalla , Khan M. B. Asad , Gianni Bernardi , Michiel A. Brentjens , A. G. de Bruyn , Sander Bus , Benedetta Ciardi , Soobash Daiboo , Elizabeth R. Fernandez , Abhik Ghosh , Hannes Jensen , Sanaz Kazemi , Léon V. E. Koopmans , Panagiotis Labropoulos , Maaijke Mevius , Oscar Martinez , Garrelt Mellema , Andre. R. Offringa , Vishhambhar N. Pandey , Joop Schaye , Rajat M. Thomas , Harish K. Vedantham , Vamsikrishna Veligatla , Stefan J. Wijnholds , Sarod Yatawatta

First Results from HERA Phase II

We report the first upper limits on the power spectrum of 21-cm fluctuations during the Epoch of Reionization and Cosmic Dawn from Phase II of the Hydrogen Epoch of Reionization Array (HERA) experiment. HERA Phase II constitutes several…

Cosmology and Nongalactic Astrophysics · Physics 2025-11-27 The HERA Collaboration , Zuhra Abdurashidova , Tyrone Adams , James E. Aguirre , Rushelle Baartman , Rennan Barkana , Lindsay M. Berkhout , Gianni Bernardi , Tashalee S. Billings , Bruno B. Bizarria , Judd D. Bowman , Daniela Breitman , Philip Bull , Jacob Burba , Ruby Byrne , Steven Carey , Rajorshi Sushovan Chandra , Kai-Feng Chen , Samir Choudhuri , Tyler Cox , David R. DeBoer , Eloy de Lera Acedo , Matt Dexter , Jiten Dhandha , Joshua S. Dillon , Scott Dynes , Nico Eksteen , John Ely , Aaron Ewall-Wice , Nicolas Fagnoni , Anastasia Fialkov , Steven R. Furlanetto , Kingsley Gale-Sides , Hugh Garsden , Adelie Gorce , Deepthi Gorthi , Ziyaad Halday , Bryna J. Hazelton , Jacqueline N. Hewitt , Jack Hickish , Tian Huang , Daniel C. Jacobs , Alec Josaitis , Nicholas S. Kern , Joshua Kerrigan , Piyanat Kittiwisit , Matthew Kolopanis , Adam Lanman , Paul La Plante , Adrian Liu , Yin-Zhe Ma , David H. E. MacMahon , Lourence Malan , Cresshim Malgas , Keith Malgas , Bradley Marero , Zachary E. Martinot , Lisa McBride , Andrei Mesinger , Jordan Mirocha , Nicel Mohamed-Hinds , Mathakane Molewa , Miguel F. Morales , Julian B. Muñoz , Steven G. Murray , Bojan Nikolic , Hans Nuwegeld , Aaron R. Parsons , Robert Pascua , Nipanjana Patra , Simon Pochinda , Yuxiang Qin , Eleanor Rath , Nima Razavi-Ghods , Daniel Riley , Kathryn Rosie , Mario G. Santos , Saurabh Singh , Dara Storer , Hilton Swarts , Jianrong Tan , Emilie Thélie , Pieter van Wyngaarden , Michael J. Wilensky , Peter K. G. Williams , Haoxuan Zheng

Upper limits on the 21-cm Epoch of Reionization power spectrum from one night with LOFAR

We present the first limits on the Epoch of Reionization (EoR) 21-cm HI power spectra, in the redshift range $z=7.9-10.6$, using the Low-Frequency Array (LOFAR) High-Band Antenna (HBA). In total 13\,h of data were used from observations…

Cosmology and Nongalactic Astrophysics · Physics 2017-04-05 A. H. Patil , S. Yatawatta , L. V. E. Koopmans , A. G. de Bruyn , M. A. Brentjens , S. Zaroubi , K. M. B. Asad , M. Hatef , V. Jelic , M. Mevius , A. R. Offringa , V. N. Pandey , H. Vedantham , F. B. Abdalla , W. N. Brouw , E. Chapman , B. Ciardi , B. K. Gehlot , A. Ghosh , G. Harker , I. T. Iliev , K. Kakiichi , S. Majumdar , M. B. Silva , G. Mellema , J. Schaye , D. Vrbanec , S. J. Wijnholds

Gridded and direct Epoch of Reionisation bispectrum estimates using the Murchison Widefield Array

We apply two methods to estimate the 21~cm bispectrum from data taken within the Epoch of Reionisation (EoR) project of the Murchison Widefield Array (MWA). Using data acquired with the Phase II compact array allows a direct bispectrum…

Cosmology and Nongalactic Astrophysics · Physics 2019-07-24 Cathryn M. Trott , Catherine A. Watkinson , Christopher H. Jordan , Shintaro Yoshiura , Suman Majumdar , N. Barry , R. Byrne , B. J. Hazelton , K. Hasegawa , R. Joseph , T. Kaneuji , K. Kubota , W. Li , J. Line , C. Lynch , B. McKinley , D. A. Mitchell , M. F. Morales , S. Murray , B. Pindor , J. C. Pober , M. Rahimi , J. Riding , K. Takahashi , S. J. Tingay , R. B. Wayth , R. L. Webster , M. Wilensky , J. S. B. Wyithe , Q. Zheng , David Emrich , A. P. Beardsley , T. Booler , B. Crosse , T. M. O. Franzen , L. Horsley , M. Johnston-Hollitt , D. L. Kaplan , D. Kenney , D. Pallot , G. Sleap , K. Steele , M. Walker , A. Williams , C. Wu

Detecting 21 cm EoR Signal using Drift Scans: Correlation of Time-ordered Visibilities

We present a formalism to extract the EoR HI power spectrum for drift scans using radio interferometers. Our main aim is to determine the coherence time scale of time-ordered visibilities. We compute the two-point correlation function of…

Cosmology and Nongalactic Astrophysics · Physics 2020-07-08 Akash Kumar Patwa , Shiv Sethi

Sensitivity for 21cm Bispectrum from Epoch of Reionization

The 21cm line brightness temperature brings rich information about Epoch of Reionizaton (EoR) and high-$z$ universe (Cosmic Dawn and Dark Age). While the power spectrum is a useful tool to investigate the EoR signal statistically,…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-15 Shintaro Yoshiura , Hayato Shimabukuro , Keitaro Takahashi , Rieko Momose , Hiroyuki Nakanishi , Hiroshi Imai

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

A High Reliability Survey of Discrete Epoch of Reionization Foreground Sources in the MWA EoR0 Field

Detection of the Epoch of Reionization HI signal requires a precise understanding of the intervening galaxies and AGN, both for instrumental calibration and foreground removal. We present a catalogue of 7394 extragalactic sources at 182 MHz…

Instrumentation and Methods for Astrophysics · Physics 2016-09-07 P. A. Carroll , J. Line , M. F. Morales , N. Barry , A. P. Beardsley , B. J. Hazelton , D. C. Jacobs , J. C. Pober , I. S. Sullivan , R. L. Webster , G. Bernardi , J. D. Bowman , F. Briggs , R. J. Cappallo , B. E. Corey , A. de Oliveira-Costa , J. S. Dillon , D. Emrich , A. Ewall-Wice , L. Feng , B. M. Gaensler , R. Goeke , L. J. Greenhill , J. N. Hewitt , N. Hurley-Walker , M. Johnston-Hollitt , D. L. Kaplan , J. C. Kasper , HS. Kim , E. Kratzenberg , E. Lenc , A. Loeb , C. J. Lonsdale , M. J. Lynch , B. McKinley , S. R. McWhirter , D. A. Mitchell , E. Morgan , A. R. Neben , D. Oberoi , A. R. Offringa , S. M. Ord , S. Paul , B. Pindor , T. Prabu , P. Procopio , J. Riding , A. E. E. Rogers , A. Roshi , N. Udaya Shankar , S. K. Sethi , K. S. Srivani , R. Subrahmanyan , M. Tegmark , Nithyanandan Thyagarajan , S. J. Tingay , C. M. Trott , M. Waterson , R. B. Wayth , A. R. Whitney , A. Williams , C. L. Williams , C. Wu , J. S. B. Wyithe

A Map of Diffuse Radio Emission at 182 MHz to Enhance Epoch of Reionization Observations in the Southern Hemisphere

We present a broadband map of polarized diffuse emission at 167-198 MHz developed from data from the Murchison Widefield Array (MWA). The map is designed to improve visibility simulation and precision calibration for 21 cm Epoch of…

Cosmology and Nongalactic Astrophysics · Physics 2021-11-17 Ruby Byrne , Miguel F. Morales , Bryna Hazelton , Ian Sullivan , Nichole Barry , Christene Lynch , Jack L. B. Line , Daniel C. Jacobs