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The study of the angular and spatial distribution of radio selected AGNs and star-forming galaxies in the ELAIS N1 field
Astrophysics of Galaxies · Submitted 27 Feb 2020
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find that the spatial clustering length and bias to the dark matter density field of SFGs are smaller than AGNs at both frequencies.
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The abstract, sentence by sentence
The cosmic evolution of bias of different source populations with underlying dark matter density field in post reionization era can shed light on large scale structures. Studying the angular and spatial distribution of different compact sources using deep radio catalogue at low-frequency is essential to understand the matter distribution of the present Universe. Here, we investigate the relationship of luminous matter with their host dark matter haloes by measuring the angular and spatial clustering of sources (two-point statistics), using deep radio observation of ELAIS N1 (EN1) field with upgraded Giant Metrewave Radio Telescope (uGMRT) at 300-500 MHz. We also analyze the 612 MHz GMRT archival data of the same field to understand the cosmic evolution of clustering of different source populations. We classify the sources as star-forming galaxies (SFGs) and active galactic nuclei (AGN) based on their radio luminosity. We find that the spatial clustering length and bias to the dark matter density field of SFGs are smaller than AGNs at both frequencies. This proves that AGNs are mainly hosted by massive haloes and hence strongly clustered. However, a small decrease in the bias for both kind of sources at higher frequency indicates that we are most likely tracing the faint objects residing in less massive haloes at higher frequencies. Our results are in excellent agreement with previous findings at radio and multi-frequency surveys. However, comparison with SKADS simulation suggests that the halo mass for different populations used in the simulation is systematically lower. This work quantifies the spatial distribution of extragalactic compact objects in EN1 field and bridges the gap between shallow and deep surveys.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The cosmic evolution of bias of different source populations with underlying dark matter density field in post reionization era can shed light on large scale structures. | background 1.00 | 0.04 | 0.02 | hedged possibility 0.67 |
| s1 | Studying the angular and spatial distribution of different compact sources using deep radio catalogue at low-frequency is essential to understand the matter distribution of the present Universe. | background 1.00 | 0.07 | 0.03 | asserted 1.00 |
| s2 | Here, we investigate the relationship of luminous matter with their host dark matter haloes by measuring the angular and spatial clustering of sources (two-point statistics), using deep radio observation of ELAIS N1 (EN1) field with upgraded Giant Metrewave Radio Telescope (uGMRT) at 300-500 MHz. | contribution 0.60 | 0.97 | 0.04 | asserted 0.95 |
| s3 | We also analyze the 612 MHz GMRT archival data of the same field to understand the cosmic evolution of clustering of different source populations. | method 0.83 | 0.92 | 0.02 | asserted 0.89 |
| s4 | We classify the sources as star-forming galaxies (SFGs) and active galactic nuclei (AGN) based on their radio luminosity. | method 0.99 | 0.91 | 0.02 | asserted 0.99 |
| s5 | We find that the spatial clustering length and bias to the dark matter density field of SFGs are smaller than AGNs at both frequencies. | result 1.00 | 0.97 | 0.47 | asserted 1.00 |
| s6 | This proves that AGNs are mainly hosted by massive haloes and hence strongly clustered. | interpretation 1.00 | 0.79 | 0.43 | asserted 1.00 |
| s7 | However, a small decrease in the bias for both kind of sources at higher frequency indicates that we are most likely tracing the faint objects residing in less massive haloes at higher frequencies. | interpretation 0.83 | 0.91 | 0.10 | hedged possibility 1.00 |
| s8 | Our results are in excellent agreement with previous findings at radio and multi-frequency surveys. | result 0.74 | 0.42 | 0.06 | asserted 0.99 |
| s9 | However, comparison with SKADS simulation suggests that the halo mass for different populations used in the simulation is systematically lower. | result 0.86 | 0.61 | 0.06 | hedged possibility 0.79 |
| s10 | This work quantifies the spatial distribution of extragalactic compact objects in EN1 field and bridges the gap between shallow and deep surveys. | contribution 0.98 | 0.88 | 0.12 | asserted 1.00 |
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The paper
Original abstract
The cosmic evolution of bias of different source populations with underlying dark matter density field in post reionization era can shed light on large scale structures. Studying the angular and spatial distribution of different compact sources using deep radio catalogue at low-frequency is essential to understand the matter distribution of the present Universe. Here, we investigate the relationship of luminous matter with their host dark matter haloes by measuring the angular and spatial clustering of sources (two-point statistics), using deep radio observation of ELAIS N1 (EN1) field with upgraded Giant Metrewave Radio Telescope (uGMRT) at 300-500 MHz. We also analyze the 612 MHz GMRT archival data of the same field to understand the cosmic evolution of clustering of different source populations. We classify the sources as star-forming galaxies (SFGs) and active galactic nuclei (AGN) based on their radio luminosity. We find that the spatial clustering length and bias to the dark matter density field of SFGs are smaller than AGNs at both frequencies. This proves that AGNs are mainly hosted by massive haloes and hence strongly clustered. However, a small decrease in the bias for both kind of sources at higher frequency indicates that we are most likely tracing the faint objects residing in less massive haloes at higher frequencies. Our results are in excellent agreement with previous findings at radio and multi-frequency surveys. However, comparison with SKADS simulation suggests that the halo mass for different populations used in the simulation is systematically lower. This work quantifies the spatial distribution of extragalactic compact objects in EN1 field and bridges the gap between shallow and deep surveys.
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References
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1 arXiv paper cite this in 2 sentences
Papers citing it · 1 sentence without a confident label
Compares with it 1 paper
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We assessed the clustering properties of both the HI and the continuum catalogue and validated them against the empirical estimates of $w(θ)$ [ref] and $ξ(r)$ [ref] .
The Tiered Radio Extragalactic Continuum (T-RECS) simulation II: HI emission and continuum-HI cross-correlation · Conclusions · 0.98
What it cites
Uses data or values from 1 paper
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Throughout this work, we use the best fitted cosmological parameters of the Planck 2018 analysis [ref] , which are: $Ω_M$ = 0.31, $Ω_Λ$ = 0.68, $σ_8$ = 0.811, $H_0$ = 67.36 Km $s^-1$ $MPc^-1$.
Planck 2018 results. VI. Cosmological parameters · Introduction · 0.99
Cites as background 2 papers
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The transition of the universe from the neutral to ionized phase is called the epoch of reionization (EoR) [ref] ).
BINGO: a single dish approach to 21cm intensity mapping · Introduction · 0.99
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A major science objective of the radio telescopes like LOFAR [ref] or SKA [ref] is to detect the redshifted 21-cm signal from the neutral hydrogen over a large range of redshifts.
The Cosmic Dawn and Epoch of Reionization with the Square Kilometre Array · Conclusion · 0.95
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