Astrophysics · arXiv:astro-ph/0405553 v3 · submitted 27 May 2004
Predictions on the angular power spectrum of clustered extragalactic point sources at CMB frequencies from flat and all–sky 2D-simulations
The paper says
“On the other hand, our current findings show that at higher frequencies the clustering signal could severely reduce the detectability of intrinsic CMB anisotropies, thus confirming previous theoretical predictions.”
from the abstract · picked out as the main claim by a classifier
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Abstract
We present predictions on the angular power spectrum of CMB fluctuations due to extragalactic point sources (EPS) by using a method for simulating realistic 2D distributions of clustered EPS. Both radio and far–IR selected source populations are taken into account. To analyze different clustering scenarios, we exploit angular power spectra of EPS, P(k), estimated either by data coming from currently available surveys or by means of theoretical predictions. By adopting the source number counts predicted by the Toffolatti et al. (1998) evolution model – capable of accounting well for the available data at radio cm wavelengths – we are able to reproduce current data on the two–point angular correlation functions, w(θ), of radio sources. We can confirm that the detection of primordial CMB anisotropies is not hampered by undetected clustered sources at frequencies ≤ 150−200 GHz. On the other hand, our current findings show that at higher frequencies the clustering signal could severely reduce the detectability of intrinsic CMB anisotropies, thus confirming previous theoretical predictions. We also show that unsubtracted EPS can account for the excess signal at high multipoles detected by recent CMB anisotropy experiments. Moreover, the additional power due to the clustering of sources gives rise to a small but not negligible contribution to the same excess signal. As a final result, we also present an example of a currently feasible {\it realistic map} of EPS at 70 GHz, by taking into account data on bright detected sources as well as the previously quoted model for number counts.
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abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: hedged possibility 0.95
What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.48 · human participants 0.01 · controlled comparison 0.09 · randomized assignment 0.01 · states quantitative result 0.83 · compares with prior results 0.91 · mentions code or data availability 0.03
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v3). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| We present predictions on the angular power spectrum of CMB fluctuations due to extragalactic point sources (EPS) by using a method for simulating realistic 2D distributions of clustered EPS. | contribution 0.99 | 0.94 | 0.05 | asserted 0.99 |
| Both radio and far--IR selected source populations are taken into account. | method 0.80 | 0.44 | 0.02 | asserted 0.98 |
| To analyze different clustering scenarios, we exploit angular power spectra of EPS, $P(k)$, estimated either by data coming from currently available surveys or by means of theoretical predictions. | method 0.99 | 0.79 | 0.03 | asserted 0.94 |
| By adopting the source number counts predicted by the Toffolatti et al. (1998) evolution model -- capable of accounting well for the available data at radio cm wavelengths -- we are able to reproduce current data on the two--point angular correlation functions, $w(\theta)$, of radio sources. | result 0.52 | 0.78 | 0.05 | asserted 0.97 |
| We can confirm that the detection of primordial CMB anisotropies is not hampered by undetected clustered sources at frequencies $\leq 150-200$ GHz. | result 0.94 | 0.87 | 0.29 | asserted 0.99 |
| On the other hand, our current findings show that at higher frequencies the clustering signal could severely reduce the detectability of intrinsic CMB anisotropies, thus confirming previous theoretical predictions. | result 0.80 | 0.89 | 0.34 | hedged possibility 0.95 |
| We also show that unsubtracted EPS can account for the excess signal at high multipoles detected by recent CMB anisotropy experiments. | result 0.98 | 0.90 | 0.14 | asserted 1.00 |
| Moreover, the additional power due to the clustering of sources gives rise to a small but not negligible contribution to the same excess signal. | result 0.99 | 0.89 | 0.08 | asserted 0.99 |
| As a final result, we also present an example of a currently feasible {\it realistic map} of EPS at 70 GHz, by taking into account data on bright detected sources as well as the previously quoted model for number counts. | result 0.57 | 0.93 | 0.07 | asserted 0.99 |
What kind of paper the classifier reports this is: simulation study 1.00 · evidence from simulation or computation 1.00
What was examined, and what was not
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- arXiv listing abstract v3
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- full text
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How the labels were made
Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 7,118 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 3 Pith papers
Reviewed papers on Pith that cite this one. The full citation record
- Robust paths to primordial $B$ modes in the presence of polarised point source contamination astro-ph.CO · Oct 2026
- The Websky Extragalactic CMB Simulations astro-ph.CO · Jan 2020
- Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity astro-ph.CO · Mar 2013
How the literature uses it
5 arXiv papers cite this in 6 sentences
Papers citing it · 4 sentences without a confident label
Uses its method or tool 1 paper
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In contrast, for proto-spheroidal galaxies we used the method elaborated in Ref. [ref] , which allowed us to distribute the sources consistently with their clustering properties, as described by the angular power spectrum, $P(k)$.
Exploring Cosmic Origins with CORE: Extragalactic sources in Cosmic Microwave Background maps · Detecting sources in polarization · 1.00
Cites it as background 1 paper
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Previous simulations modeled the different components with varying levels of accuracy, depending on the application, such as extragalactic point sources [ref] , the tSZ effect in small regions (from individual clusters subtending a few arcmin to fields of view of $∼$ 100 sq deg.) [ref] , the CIB [ref] , the kSZ [ref] , and CMB lensing [ref] .
The Websky Extragalactic CMB Simulations · Introduction · 0.88
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