Hi intensity mapping with the MIGHTEE Survey: first results of the Hi power spectrum

Monthly Notices of the Royal Astronomical Society Oxford University Press 541:1 (2025) 476-493

Authors:

Aishrila Mazumder, Laura Wolz, Zhaoting Chen, Sourabh Paul, Mario G Santos, Matt Jarvis, Junaid Townsend, Srikrishna Sekhar, Russ Taylor

Abstract:

We present the first results of the H i intensity mapping power spectrum analysis with the MeerKAT International GigaHertz Tiered Extragalactic Exploration (MIGHTEE) survey. We use data covering 4 square degrees in the COSMOS field using a frequency range of 962.5–1008.42 MHz, equivalent to H i emission in . The data consist of 15 pointings with a total of 94.2 h on-source. We verify the suitability of the MIGHTEE data for H i intensity mapping by testing for residual systematics across frequency, baselines, and pointings. We also vary the window used for H i signal measurements and find no significant improvement using stringent Fourier mode cuts. We compute the H i power spectrum at scales in autocorrelation as well as cross-correlation between observational scans using power spectrum domain averaging for pointings. We report consistent upper limits of 29.8 mK Mpc from the 2 cross-correlation measurements and 25.82 mK Mpc from autocorrelation at 2 Mpc.The low signal-to-noise ratio in this data potentially limits our ability to identify residual systematics, which will be addressed in the future by incorporating more data in the analysis.

MIGHTEE-HI: The direct detection of neutral hydrogen in galaxies at $z>0.25$

(2025)

Authors:

Matt J Jarvis, Madalina N Tudorache, I Heywood, Anastasia A Ponomareva, M Baes, Natasha Maddox, Kristine Spekkens, Andreea Varasteanu, CL Hale, Mario G Santos, RG Varadaraj, Elizabeth AK Adams, Alessandro Bianchetti, Barbara Catinella, Jacinta Delhaize, M Maksymowicz-Maciata, Pavel E Mancera Piña, Hengxing Pan, Amélie Saintonge, Gauri Sharma, O Ivy Wong

Cosmology from LOFAR Two-metre Sky Survey Data Release 2: Counts-in-cells statistics

Astronomy & Astrophysics EDP Sciences 698 (2025) a148

Authors:

Morteza Pashapour-Ahmadabadi, Lukas Böhme, Thilo M Siewert, Dominik J Schwarz, Catherine L Hale, Caroline Heneka, Prabhakar Tiwari, Jinglan Zheng

Cosmology from LOFAR Two-metre Sky Survey Data Release 2: Cross-correlations with luminous red galaxies from eBOSS

Astronomy & Astrophysics EDP Sciences 698 (2025) a58

Authors:

Jinglan Zheng, Prabhakar Tiwari, Gong-Bo Zhao, Dominik J Schwarz, David Bacon, Stefano Camera, Caroline Heneka, Catherine Hale, Szymon J Nakoneczny, Morteza Pashapour-Ahmadabadi

SYREN-NEW: Precise formulae for the linear and nonlinear matter power spectra with massive neutrinos and dynamical dark energy

Astronomy & Astrophysics EDP Sciences 698 (2025) a1

Authors:

Ce Sui, Deaglan J Bartlett, Shivam Pandey, Harry Desmond, Pedro G Ferreira, Benjamin D Wandelt