Effect of non-equilibrium ionization on derived physical conditions of the high-z intergalactic medium Article Swipe
Prakash Gaikwad
,
R. Srianand
,
Vikram Khaire
,
Tirthankar Roy Choudhury
·
YOU?
·
· 2019
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stz2692
YOU?
·
· 2019
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stz2692
Non-equilibrium ionization effects are important in cosmological hydrodynamical simulations but are computationally expensive. We study the effect of non-equilibrium ionization evolution and UV ionizing background (UVB) generated with different quasar spectral energy distribution (SED) on the derived physical conditions of the intergalactic medium at 2 ≤ z ≤ 6 using our post-processing tool ‘Code for Ionization and Temperature Evolution’ (cite). cite produces results matching well with self-consistent simulations more efficiently. The He ii reionization progresses more rapidly in non-equilibrium model compared to equilibrium models. The redshift of He ii reionization strongly depends on the quasar SED and occurs earlier for UVB models with flatter quasar SEDs. During this epoch, the normalization of temperature–density relation, T0(z), has a maximum while the slope, γ(z), has a minimum, but occurring at different redshifts. The T0 is higher in non-equilibrium models using UVB obtained with flatter quasar SEDs. While our models produce the observed median He ii effective optical depth evolution and its scatter for equilibrium and non-equilibrium considerations, to explain the observed cumulative distributions we may need to consider fluctuating UVB. For a given UVB model, the redshift dependence of the H i photoionization rate derived from the observed H i effective optical depth (τeff, H i) for the equilibrium model is different from that for the non-equilibrium model. This may lead to different requirements on the evolution of ionizing emissivities of sources. We show that, in the absence of strong differential pressure smoothing effects, it is possible to recover the T0 and γ realized in non-equilibrium model from the equilibrium models generated by rescaling photoheating rates while producing the same τeff, H i.
Related Topics
Concepts
Physics
Reionization
Quasar
Redshift
Astrophysics
Ionization
Photoionization
Intergalactic medium
Thermal equilibrium
Optical depth
Galaxy
Thermodynamics
Quantum mechanics
Meteorology
Aerosol
Ion
Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1093/mnras/stz2692
- OA Status
- green
- Cited By
- 21
- References
- 112
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W2902245876
All OpenAlex metadata
Raw OpenAlex JSON
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https://openalex.org/W2902245876Canonical identifier for this work in OpenAlex
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https://doi.org/10.1093/mnras/stz2692Digital Object Identifier
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Effect of non-equilibrium ionization on derived physical conditions of the high-z intergalactic mediumWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2019Year of publication
- Publication date
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2019-10-03Full publication date if available
- Authors
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Prakash Gaikwad, R. Srianand, Vikram Khaire, Tirthankar Roy ChoudhuryList of authors in order
- Landing page
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https://doi.org/10.1093/mnras/stz2692Publisher landing page
- Open access
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YesWhether a free full text is available
- OA status
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greenOpen access status per OpenAlex
- OA URL
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https://arxiv.org/pdf/1812.01016Direct OA link when available
- Concepts
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Physics, Reionization, Quasar, Redshift, Astrophysics, Ionization, Photoionization, Intergalactic medium, Thermal equilibrium, Optical depth, Galaxy, Thermodynamics, Quantum mechanics, Meteorology, Aerosol, IonTop concepts (fields/topics) attached by OpenAlex
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21Total citation count in OpenAlex
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2025: 3, 2024: 2, 2023: 4, 2022: 2, 2021: 3Per-year citation counts (last 5 years)
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112Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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