Astrophysics · arXiv:astro-ph/0401340 v1 · submitted 16 Jan 2004
Neutral hydrogen surveys for high redshift galaxy clusters and proto-clusters
The paper says
“We find a surprisingly large number of objects might be detected even using small (approx. 5%) bandwidths and elaborate on some issues pertinent to optimising the design of the instrument and the survey strategy.”
from the abstract · picked out as the main claim by a classifier
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The paper
Abstract
We discuss the possibility of performing blind surveys to detect large-scale features of the universe using 21cm emission. Using instruments with approx. 5'-10' resolution currently in the planning stage, it should be possible to detect virialized galaxy clusters at intermediate redshifts using the combined emission from their constituent galaxies, as well as less overdense structures, such as proto-clusters and the `cosmic web', at higher redshifts. Using semi-analytic methods we compute the number of virialized objects and those at turnaround which might be detected by such surveys. We find a surprisingly large number of objects might be detected even using small (approx. 5%) bandwidths and elaborate on some issues pertinent to optimising the design of the instrument and the survey strategy. The main uncertainty is the fraction of neutral gas relative to the total dark matter within the object. We discuss this issue in the context of the observations which are currently available.
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abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: asserted 0.73
What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.93 · human participants 0.01 · controlled comparison 0.02 · randomized assignment 0.01 · states quantitative result 0.37 · compares with prior results 0.10 · mentions code or data availability 0.02
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v1). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| We discuss the possibility of performing blind surveys to detect large-scale features of the universe using 21cm emission. | contribution 0.50 | 0.22 | 0.06 | hedged possibility 0.95 |
| Using instruments with approx. 5'-10' resolution currently in the planning stage, it should be possible to detect virialized galaxy clusters at intermediate redshifts using the combined emission from their constituent galaxies, as well as less overdense structures, such as proto-clusters and the `cosmic web', at higher redshifts. | method 0.58 | 0.14 | 0.18 | hedged possibility 0.99 |
| Using semi-analytic methods we compute the number of virialized objects and those at turnaround which might be detected by such surveys. | method 0.92 | 0.94 | 0.06 | asserted 0.95 |
| We find a surprisingly large number of objects might be detected even using small (approx. 5%) bandwidths and elaborate on some issues pertinent to optimising the design of the instrument and the survey strategy. | result 1.00 | 0.94 | 0.60 | asserted 0.73 |
| The main uncertainty is the fraction of neutral gas relative to the total dark matter within the object. | limitation 0.98 | 0.42 | 0.13 | asserted 0.99 |
| We discuss this issue in the context of the observations which are currently available. | contribution 0.60 | 0.43 | 0.04 | unclear 0.56 |
What kind of paper the classifier reports this is: theoretical result 0.43 · evidence from simulation or computation 0.99
What was examined, and what was not
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- arXiv listing abstract v1
Not examined
- full text
- figures and tables
- references and citing sentences
- relations to other papers
Levels run
- P abstract
Not run
- S sections
- T body sentences
- C citations
- R cross-paper relations
How the labels were made
Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,949 input tokens.
Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON
Cited by 18 Pith papers
Reviewed papers on Pith that cite this one. The full citation record
- Mitigating oscillatory systematics in MeerKLASS L-band H i intensity maps astro-ph.IM · Nov 2026
- Cosmological Inference with Gravitational-Wave Dark Sirens and 21-cm Intensity Mapping: Forecasts for LIGO-Virgo-KAGRA with MeerKAT and SKAO astro-ph.CO · Oct 2026
- The $N_\ell$ of gravitational wave background experiments astro-ph.CO · May 2020
- Ingredients for 21cm intensity mapping astro-ph.CO · Apr 2018
- On the spatial distribution of neutral hydrogen in the Universe: bias and shot-noise of the HI Power Spectrum astro-ph.CO · Sep 2016
- Ultra large-scale cosmology in next-generation experiments with single tracers astro-ph.CO · May 2015
- JESSNet: Joint dEconvolution and Sparse Separation Network for HI 21 cm foreground cleaning astro-ph.CO · Oct 2026
- High-redshift post-reionization cosmology with 21cm intensity mapping astro-ph.CO · Sep 2017
- Constraining ultra large-scale cosmology with multiple tracers in optical and radio surveys astro-ph.CO · Jul 2015
- Blind foreground subtraction for intensity mapping experiments astro-ph.CO · Sep 2014
- Late-time cosmology with 21cm intensity mapping experiments astro-ph.CO · May 2014
- Cosmology on Ultralarge Scales with Intensity Mapping of the Neutral Hydrogen 21 cm Emission: Limits on Primordial Non-Gaussianity astro-ph.CO · May 2013
- Forecast on $f(R)$ Gravity with HI 21cm Intensity Mapping Surveys astro-ph.CO · Feb 2026
- Weighing neutrinos with 21cm Intensity Mapping at the SKAO astro-ph.CO · Apr 2025
- Probing primordial features with next-generation photometric and radio surveys astro-ph.CO · Dec 2017
- Extending cosmological tests of General Relativity with the Square Kilometre Array astro-ph.CO · Sep 2015
- Unveiling the Universe with Emerging Cosmological Probes astro-ph.CO · Jan 2022
- Cosmology with post-EoR 21 cm Intensity Mapping surveys: power spectrum measurements in the last decade astro-ph.CO · Oct 2026
How the literature uses it
21 arXiv papers cite this in 22 sentences
Papers citing it · 11 sentences without a confident label
Cites it as background 11 papers
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Each has its own advantages and disadvantages, but in this paper, we instead focus on a third probe proposed for cosmological studies: HI intensity mapping [ref] .
Probing primordial non-Gaussianity with the power spectrum and bispectrum of future 21cm intensity maps · Introduction · 0.86
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A new cosmological observable has recently been proposed that is expected to play an important role in future cosmology: 21cm intensity mapping [ref] .
Weighing neutrinos with cosmic neutral hydrogen · Introduction · 0.86
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An alternative approach is to make low-resolution maps of the integrated emission from many galaxies, in a process known as intensity mapping [ref] .
Extending cosmological tests of General Relativity with the Square Kilometre Array · Intensity mapping surveys · 0.93
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