Bradley Greig

Constraining the 21cm brightness temperature of the IGM at z=6.6 around LAEs with the murchison widefield array

CM Trott, CH Jordan, JLB Line, CR Lynch, S Yoshiura, B McKinley, P Dayal, B Pindor, A Hutter, K Takahashi, RB Wayth, N Barry, A Beardsley, J Bowman, R Byrne, A Chokshi, B Greig, K Hasegawa, BJ Hazelton, E Howard, et al.

Journal article  |  2021  |  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

The locations of Ly α-emitting galaxies (LAEs) at the end of the Epoch of Reionization (EoR) are expected to correlate with region..

Effects of model incompleteness on the drift-scan calibration of radio telescopes

Bharat K Gehlot, Daniel C Jacobs, Judd D Bowman, Nivedita Mahesh, Steven G Murray, Matthew Kolopanis, Adam P Beardsley, Zara Abdurashidova, James E Aguirre, Paul Alexander, Zaki S Ali, Yanga Balfour, Gianni Bernardi, Tashalee S Billings, Richard F Bradley, Phil Bull, Jacob Burba, Steve Carey, Chris L Carilli, Carina Cheng, et al.

Journal article  |  2021  |  Monthly Notices of the Royal Astronomical Society

ABSTRACT Precision calibration poses challenges to experiments probing the redshifted 21-cm signal of neutral hydro..

A new MWA limit on the 21 cm power spectrum at redshifts similar to 13-17

S Yoshiura, B Pindor, JLB Line, N Barry, CM Trott, A Beardsley, J Bowman, R Byrne, A Chokshi, BJ Hazelton, K Hasegawa, E Howard, B Greig, D Jacobs, CH Jordan, R Joseph, M Kolopanis, C Lynch, B McKinley, DA Mitchell, et al.

Journal article  |  2021  |  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

ABSTRACT Observations in the lowest Murchison Widefield Array (MWA) band between 75 and 100 MHz have the potential ..

Methods of Error Estimation for Delay Power Spectra in 21 cm Cosmology

Jianrong Tan, Adrian Liu, Nicholas S Kern, 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, Steven Carey, Christopher L Carilli, Carina Cheng, David R DeBoer, Matt Dexter, et al.

Journal article  |  2021  |  ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES

Precise measurements of the 21 cm power spectrum are crucial for understanding the physical processes of hydrogen reionization. Cu..

A Real Time Processing system for big data in astronomy: Applications to HERA

P La Plante, PKG Williams, M Kolopanis, JS Dillon, AP Beardsley, NS Kern, M Wilensky, ZS Ali, Z Abdurashidova, JE Aguirre, P Alexander, Y Balfour, G Bernardi, TS Billings, JD Bowman, RF Bradley, P Bull, J Burba, S Carey, CL Carilli, et al.

Journal article  |  2021  |  ASTRONOMY AND COMPUTING

As current- and next-generation astronomical instruments come online, they will generate an unprecedented deluge of data. Analyzin..

A tale of two sites - II. Inferring the properties of minihalo-hosted galaxies with upcoming 21-cm interferometers

Yuxiang Qin, Andrei Mesinger, Bradley Greig, Jaehong Park

Journal article  |  2021  |  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

The first generation of galaxies is expected to form in minihaloes, accreting gas through H2 cooling, and possessing unique proper..

Interpreting LOFAR 21-cm signal upper limits at z approximate to 9.1 in the context of high-z galaxy and reionization observations

Bradley Greig, Andrei Mesinger, Leon VE Koopmans, Benedetta Ciardi, Garrelt Mellema, Saleem Zaroubi, Sambit K Giri, Raghunath Ghara, Abhik Ghosh, Ilian T Iliev, Florent G Mertens, Rajesh Mondal, Andre R Offringa, Vishambhar N Pandey

Journal article  |  2021  |  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Using the latest upper limits on the 21-cm power spectrum at z ≈ 9.1 from the Low Frequency Array (LOFAR), we explore the regions ..

Exploring reionization and high-z galaxy observables with recent multiredshift MWA upper limits on the 21-cm signal

Bradley Greig, Cathryn M Trott, Nichole Barry, Simon J Mutch, Bart Pindor, Rachel L Webster, J Stuart B Wyithe

Journal article  |  2021  |  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

We use the latest multiredshift (z = 6.5-8.7) upper limits on the 21-cm signal from the Murchison Widefield Array (MWA) to explore..

Stacking redshifted 21 cm images of H II regions around high-redshift galaxies as a probe of early reionization

James E Davies, Rupert AC Croft, Tiziana Di-Matteo, Bradley Greig, Yu Feng, J Stuart B Wyithe

Journal article  |  2021  |  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

A number of current and future experiments aim to detect the reionization of neutral hydrogen by the first stars and galaxies in t..

Understanding the HERA Phase I receiver system with simulations and its impact on the detectability of the EoR delay power spectrum

Nicolas Fagnoni, Eloy de Lera Acedo, David R DeBoer, 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, Phil Bull, Jacob Burba, Chris L Carilli, Carina Cheng, Matt Dexter, Joshua S Dillon, Aaron Ewall-Wice, et al.

Journal article  |  2021  |  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

The detection of the Epoch of Reionization (EoR) delay power spectrum using a 'foreground avoidance method' highly depends on the ..