activity
20122026
most citedThe LOFAR Two-metre Sky Survey - II. First data release

586 citations · 1.9k across the 34 of their papers we have counts for

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Showing 2025Show all

11 papers · 1 filter

astro-ph.IM2025★ 1 cited

The impact of lunar topography on the 21-cm power spectrum for grid-based arrays : Insights for the Dark-ages EXplorer (DEX)

S. Ghosh, L. V. E. Koopmans, C. Brinkerink +17

The Dark Ages (DA) provides a crucial window into the physics of the infant Universe, with the 21-cm signal offering the only direct probe for mapping out the three-dimensional dis…

astro-ph.CO2025★ 11 cited

Improved upper limits on the 21-cm signal power spectrum at and from an optimal field observed with NenuFAR

S. Munshi, F. G. Mertens, J. K. Chege +19

We report the deepest upper limits to date on the power spectrum of the 21-cm signal during the Cosmic Dawn (redshifts: ), using four nights of observations with NenuFAR. The…

astro-ph.CO2025

Mitigating incoherent excess variance in high-redshift 21 cm observations with multi-output cross-Gaussian process regression

S. Munshi, L. V. E. Koopmans, F. G. Mertens +8

Systematic effects that limit the achievable sensitivity of current low-frequency radio telescopes to the 21 cm signal are among the foremost challenges in observational 21 cm cosm…

astro-ph.CO2025★ 14 cited

Constraints on the state of the IGM at using redshifted 21-cm observations with LOFAR

R. Ghara, S. Zaroubi, B. Ciardi +21

The power spectra of the redshifted 21-cm signal from the Epoch of Reionization (EoR) contain information about the ionization and thermal states of the intergalactic medium (IGM),…

astro-ph.CO2025★ 7 cited

First upper limits on the 21-cm signal power spectrum of neutral hydrogen at from the LOFAR 3C196 field

E. Ceccotti, A. R. Offringa, F. G. Mertens +16

The redshifted 21-cm signal of neutral hydrogen from the Epoch of Reionization (EoR) can potentially be detected using low-frequency radio instruments such as the Low-Frequency Arr…

astro-ph.CO2025★ 27 cited

Deeper multi-redshift upper limits on the Epoch of Reionization 21-cm signal power spectrum from LOFAR between z=8.3 and z=10.1

F. G. Mertens, M. Mevius, L. V. E. Koopmans +20

We present new upper limits on the 21-cm signal power spectrum from the Epoch of Reionization (EoR), at redshifts , based on reprocessed obse…