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Self-regulated reionization
Astrophysics · Submitted 22 Jul 2006
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim By including these smaller-mass haloes but accounting for their suppression, too, we find that reionization is ``self-regulating,'' as follows.
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The abstract, sentence by sentence
Recently, we have presented the first large-scale radiative transfer simulations of reionization. Here we present new simulations which extend the source halo mass range downward to 10^8M_solar, to capture the full range of halo masses thought to be primarily responsible for reionization by their star formation following atomic hydrogen radiative cooling and gravitational collapse. Haloes below about 10^9M_solar, however, are subject to Jeans-mass filtering in the ionized regions, which suppresses their baryonic content and their ability to release ionizing radiation. By including these smaller-mass haloes but accounting for their suppression, too, we find that reionization is ``self-regulating,'' as follows. As the mean ionized fraction rises, so does the fraction of the volume within which suppression occurs. Hence, the degree of suppression is related to the mean ionized fraction. Since low-mass haloes with high emissivity achieve a given mean ionized fraction earlier than do those with low efficiency, Jeans-mass filtering compensates for the difference in the emissivity of the suppressible haloes in these two cases. As a result, in the presence of lower-mass source haloes, reionization begins earlier, but the later stages of reionization and the time of overlap are dictated by the efficiency of the higher-mass haloes, independent of the efficiency of the suppressible, lower-mass haloes. Reionization histories consistent with current observational constraints are shown to be achievable with standard stellar sources in haloes above 10^8M_solar. Neither minihalos nor exotic sources are required, and the phenomenon of ``double reionization'' previously suggested does not occur. (abridged)
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Recently, we have presented the first large-scale radiative transfer simulations of reionization. | background 0.89 | 0.90 | 0.02 | asserted 1.00 |
| s1 | Here we present new simulations which extend the source halo mass range downward to 10^8M_solar, to capture the full range of halo masses thought to be primarily responsible for reionization by their star formation following atomic hydrogen radiative cooling and gravitational collapse. | contribution 0.97 | 0.92 | 0.05 | asserted 0.93 |
| s2 | Haloes below about 10^9M_solar, however, are subject to Jeans-mass filtering in the ionized regions, which suppresses their baryonic content and their ability to release ionizing radiation. | background 0.89 | 0.28 | 0.05 | asserted 0.97 |
| s3 | By including these smaller-mass haloes but accounting for their suppression, too, we find that reionization is ``self-regulating,'' as follows. | result 0.43 | 0.92 | 0.41 | asserted 0.99 |
| s4 | As the mean ionized fraction rises, so does the fraction of the volume within which suppression occurs. | result 0.67 | 0.80 | 0.09 | asserted 1.00 |
| s5 | Hence, the degree of suppression is related to the mean ionized fraction. | interpretation 0.60 | 0.78 | 0.10 | asserted 1.00 |
| s6 | Since low-mass haloes with high emissivity achieve a given mean ionized fraction earlier than do those with low efficiency, Jeans-mass filtering compensates for the difference in the emissivity of the suppressible haloes in these two cases. | interpretation 0.86 | 0.79 | 0.12 | asserted 1.00 |
| s7 | As a result, in the presence of lower-mass source haloes, reionization begins earlier, but the later stages of reionization and the time of overlap are dictated by the efficiency of the higher-mass haloes, independent of the efficiency of the suppressible, lower-mass haloes. | result 0.54 | 0.90 | 0.66 | asserted 1.00 |
| s8 | Reionization histories consistent with current observational constraints are shown to be achievable with standard stellar sources in haloes above 10^8M_solar. | result 0.95 | 0.88 | 0.14 | asserted 0.51 |
| s9 | Neither minihalos nor exotic sources are required, and the phenomenon of ``double reionization'' previously suggested does not occur. (abridged) | result 0.57 | 0.71 | 0.24 | asserted 1.00 |
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The paper
Original abstract
Recently, we have presented the first large-scale radiative transfer simulations of reionization. Here we present new simulations which extend the source halo mass range downward to 10^8M_solar, to capture the full range of halo masses thought to be primarily responsible for reionization by their star formation following atomic hydrogen radiative cooling and gravitational collapse. Haloes below about 10^9M_solar, however, are subject to Jeans-mass filtering in the ionized regions, which suppresses their baryonic content and their ability to release ionizing radiation. By including these smaller-mass haloes but accounting for their suppression, too, we find that reionization is ``self-regulating,'' as follows. As the mean ionized fraction rises, so does the fraction of the volume within which suppression occurs. Hence, the degree of suppression is related to the mean ionized fraction. Since low-mass haloes with high emissivity achieve a given mean ionized fraction earlier than do those with low efficiency, Jeans-mass filtering compensates for the difference in the emissivity of the suppressible haloes in these two cases. As a result, in the presence of lower-mass source haloes, reionization begins earlier, but the later stages of reionization and the time of overlap are dictated by the efficiency of the higher-mass haloes, independent of the efficiency of the suppressible, lower-mass haloes. Reionization histories consistent with current observational constraints are shown to be achievable with standard stellar sources in haloes above 10^8M_solar. Neither minihalos nor exotic sources are required, and the phenomenon of ``double reionization'' previously suggested does not occur. (abridged)
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References
How the literature uses it
10 arXiv papers cite this in 11 sentences
Papers citing it · 8 sentences without a confident label
Uses its method or tool 1 paper
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While our first generation of reionization simulations used this method coded in Open MP for shared memory parallel computers [ref] , the second generation simulations highlighted here used a new version of C$^2$-Ray, recoded for massively parallel computers with distributed memory (MPI + Open MP) [ref] .
Simulating Cosmic Reionization and the Radiation Backgrounds from the Epoch of Reionization · Radiative Transfer · 0.93
Uses its data or values 1 paper
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where $C$ is the clumping factor we take to be 5 as motivated in [ref] , $n_H$ is the mean hydrogen number density of the universe, $x_HI$ is the fraction of neutral hydrogen in a cell, $V_box$ is the volume of our simulation box, $Ṅ_ion,tot$ is the total number of ionizing photons per second($Ṅ_ion,γ$) for all halos in the box.
On Cross-Correlating Line Intensity Maps from SPHEREx during Reionization · Intensity Maps with Radiative Transfer · 0.90
Cites it as background 1 paper
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The kSZ itself is expected to have two components: a low-redshift, “homogeneous” term [ref] , sourced by perturbations in the free electron density after reionization and caused by the peculiar velocity of the intergalactic medium and unresolved galaxy clusters, and an additional high-redshift “patchy” term sourced by fluctuations in the ionized fraction and electron density during reionization (e.g., [ref] ).
Complementing the ground-based CMB Stage-4 experiment on large scales with the PIXIE satellite · Reionization · 0.93
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