Constraints on QSO emissivity using H i and He ii Lyman α forest Article Swipe
The spectrum of cosmic ultraviolet background radiation at He II ionizing energies (E > 4 Ryd) is important to study the He II reionization, thermal history of the intergalactic medium (IGM) and metal lines observed in QSO absorption spectra. It is determined by the emissivity of QSOs at E > 4 Ryd obtained from their observed luminosity functions and the mean spectral energy distribution (SED). The SED is approximated as a power-law at energies E > 1 Ryd, $f_E \propto E^{\alpha}$, where the existing observations constrain the power-law index $\alpha$ only up to ~2.3 Ryd. Here, we constrain $\alpha$ for E > 4 Ryd using recently measured He II Lyman-alpha effective optical depths ($\tau_{HeII}$), H I photoionization rates and updated H I distribution in the IGM. We find that -1.6 > $\alpha$ > -2 is required to reproduce the $\tau_{HeII}$ measurements when we use QSO emissivity obtained from their luminosity function using optical surveys. We also find that the models where QSOs can alone reionize H I can not reproduce the $\tau_{HeII}$ measurements. These models need modifications, such as a break in mean QSO SED at energies greater than 4 Ryd. Even after such modifications the predicted He II reionization history, showing that the He II is highly ionized even at z~5, is significantly different from the standard models. Therefore, the thermal history of the IGM will be crucial to distinguish these models. We also provide the He II photoionization rates obtained from binned $\tau_{HeII}$ measurements.
Related Topics
Concepts
Physics
Astrophysics
Reionization
Emissivity
Photoionization
Redshift
Luminosity
QSOS
Optical depth
Spectral line
Ionization
Astronomy
Galaxy
Optics
Quantum mechanics
Ion
Aerosol
Meteorology
Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1093/mnras/stx1487
- https://academic.oup.com/mnras/article-pdf/471/1/255/19371755/stx1487.pdf
- OA Status
- bronze
- Cited By
- 38
- References
- 142
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W2734594314
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W2734594314Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1093/mnras/stx1487Digital Object Identifier
- Title
-
Constraints on QSO emissivity using H i and He ii Lyman α forestWork title
- Type
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articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2017Year of publication
- Publication date
-
2017-07-11Full publication date if available
- Authors
-
Vikram KhaireList of authors in order
- Landing page
-
https://doi.org/10.1093/mnras/stx1487Publisher landing page
- PDF URL
-
https://academic.oup.com/mnras/article-pdf/471/1/255/19371755/stx1487.pdfDirect link to full text PDF
- Open access
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YesWhether a free full text is available
- OA status
-
bronzeOpen access status per OpenAlex
- OA URL
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https://academic.oup.com/mnras/article-pdf/471/1/255/19371755/stx1487.pdfDirect OA link when available
- Concepts
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Physics, Astrophysics, Reionization, Emissivity, Photoionization, Redshift, Luminosity, QSOS, Optical depth, Spectral line, Ionization, Astronomy, Galaxy, Optics, Quantum mechanics, Ion, Aerosol, MeteorologyTop concepts (fields/topics) attached by OpenAlex
- Cited by
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38Total citation count in OpenAlex
- Citations by year (recent)
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2025: 4, 2024: 6, 2023: 3, 2022: 3, 2021: 4Per-year citation counts (last 5 years)
- References (count)
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142Number of works referenced by this work
- Related works (count)
-
10Other works algorithmically related by OpenAlex
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