Constraining Reionization with the z ~ 5–6 Ly α Forest Power Spectrum: The Outlook after Planck
Abstract
The latest measurements of cosmic microwave background electron-scattering optical depth reported by Planck significantly reduces the allowed space of $${\rm{H}}\,{\rm{I}}$$ reionization models, pointing toward a later ending and/or less extended phase transition than previously believed. Reionization impulsively heats the intergalactic medium (IGM) to $$\sim {10}^{4}\,{\rm{K}}$$, and owing to long cooling and dynamical times in the diffuse gas that are comparable to the Hubble time, memory of reionization heating is retained. Therefore, a late-ending reionization has significant implications for the structure of the $$z\sim 5\mbox{-}6$$ Lyα forest. Using state-of-the-art hydrodynamical simulations that allow us to vary the timing of reionization and its associated heat injection, we argue that extant thermal signatures from reionization can be detected via the Lyα forest power spectrum at $$5\lt z\lt 6$$. This arises because the small-scale cutoff in the power depends not only the the IGM temperature at these epochs, but is also particularly sensitive to the pressure-smoothing scale set by the IGM full thermal history. Comparing our different reionization models with existing measurements of the Lyα forest flux power spectrum at $$z=5.0\mbox{-}5.4$$, we find that models satisfying Planck's $${\tau }_{e}$$ constraint favor a moderate amount of heat injection consistent with galaxies driving reionization, but disfavoring quasar-driven scenarios. We study the feasibility of measuring the flux power spectrum at $$z\simeq 6$$ using mock quasar spectra and conclude that a sample of ~10 high-resolution spectra with an attainable signal-to-noise ratio will allow distinguishing between different reionization scenarios.
- Authors:
-
[1];
[2];
- Max Planck Inst. for Astronomy, Heidelberg (Germany)
- Max Planck Inst. for Astronomy, Heidelberg (Germany); Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1493247
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 847; Journal Issue: 1; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; early universe; evolution of galaxies; formation of galaxies; intergalactic medium; large-scale structure of universe; numerical methods
Citation Formats
Oñorbe, J., Hennawi, J. F., Lukić, Z., and Walther, M.. Constraining Reionization with the z ~ 5–6 Ly α Forest Power Spectrum: The Outlook after Planck. United States: N. p., 2017.
Web. doi:10.3847/1538-4357/aa898d.
Oñorbe, J., Hennawi, J. F., Lukić, Z., & Walther, M.. Constraining Reionization with the z ~ 5–6 Ly α Forest Power Spectrum: The Outlook after Planck. United States. https://doi.org/10.3847/1538-4357/aa898d
Oñorbe, J., Hennawi, J. F., Lukić, Z., and Walther, M.. Thu .
"Constraining Reionization with the z ~ 5–6 Ly α Forest Power Spectrum: The Outlook after Planck". United States. https://doi.org/10.3847/1538-4357/aa898d. https://www.osti.gov/servlets/purl/1493247.
@article{osti_1493247,
title = {Constraining Reionization with the z ~ 5–6 Ly α Forest Power Spectrum: The Outlook after Planck},
author = {Oñorbe, J. and Hennawi, J. F. and Lukić, Z. and Walther, M.},
abstractNote = {The latest measurements of cosmic microwave background electron-scattering optical depth reported by Planck significantly reduces the allowed space of ${\rm{H}}\,{\rm{I}}$ reionization models, pointing toward a later ending and/or less extended phase transition than previously believed. Reionization impulsively heats the intergalactic medium (IGM) to $\sim {10}^{4}\,{\rm{K}}$, and owing to long cooling and dynamical times in the diffuse gas that are comparable to the Hubble time, memory of reionization heating is retained. Therefore, a late-ending reionization has significant implications for the structure of the $z\sim 5\mbox{-}6$ Lyα forest. Using state-of-the-art hydrodynamical simulations that allow us to vary the timing of reionization and its associated heat injection, we argue that extant thermal signatures from reionization can be detected via the Lyα forest power spectrum at $5\lt z\lt 6$. This arises because the small-scale cutoff in the power depends not only the the IGM temperature at these epochs, but is also particularly sensitive to the pressure-smoothing scale set by the IGM full thermal history. Comparing our different reionization models with existing measurements of the Lyα forest flux power spectrum at $z=5.0\mbox{-}5.4$, we find that models satisfying Planck's ${\tau }_{e}$ constraint favor a moderate amount of heat injection consistent with galaxies driving reionization, but disfavoring quasar-driven scenarios. We study the feasibility of measuring the flux power spectrum at $z\simeq 6$ using mock quasar spectra and conclude that a sample of ~10 high-resolution spectra with an attainable signal-to-noise ratio will allow distinguishing between different reionization scenarios.},
doi = {10.3847/1538-4357/aa898d},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 847,
place = {United States},
year = {2017},
month = {9}
}
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- Ross, Hannah E.; Dixon, Keri L.; Ghara, Raghunath
- Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 1
ETHOS – an Effective Theory of Structure Formation: detecting dark matter interactions through the Lyman-α forest
journal, May 2019
- Bose, Sownak; Vogelsberger, Mark; Zavala, Jesús
- Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 1
Impact of inhomogeneous reionization on the Lyman-α forest
journal, May 2019
- Montero-Camacho, Paulo; Hirata, Christopher M.; Martini, Paul
- Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 1
New synthesis models of consistent extragalactic background light over cosmic time
journal, January 2019
- Khaire, Vikram; Srianand, Raghunathan
- Monthly Notices of the Royal Astronomical Society, Vol. 484, Issue 3
Dark-ages reionization and galaxy formation simulation – XVI. The thermal memory of reionization
journal, August 2019
- Davies, James E.; Mutch, Simon J.; Qin, Yuxiang
- Monthly Notices of the Royal Astronomical Society, Vol. 489, Issue 1
Imprints of temperature fluctuations on the z ∼ 5 Lyman-α forest: a view from radiation-hydrodynamic simulations of reionization
journal, October 2019
- Wu, Xiaohan; McQuinn, Matthew; Kannan, Rahul
- Monthly Notices of the Royal Astronomical Society, Vol. 490, Issue 3
Inhomogeneous reionization models in cosmological hydrodynamical simulations
journal, May 2019
- Oñorbe, Jose; Davies, F. B.; Lukić, Z.
- Monthly Notices of the Royal Astronomical Society, Vol. 486, Issue 3
The Opacity of the Intergalactic Medium Measured along Quasar Sightlines at z ∼ 6
journal, August 2018
- Eilers, Anna-Christina; Davies, Frederick B.; Hennawi, Joseph F.
- The Astrophysical Journal, Vol. 864, Issue 1
New Constraints on IGM Thermal Evolution from the Ly α Forest Power Spectrum
journal, February 2019
- Walther, Michael; Oñorbe, Jose; Hennawi, Joseph F.
- The Astrophysical Journal, Vol. 872, Issue 1
Revealing Reionization with the Thermal History of the Intergalactic Medium: New Constraints from the Ly α Flux Power Spectrum
journal, February 2019
- Boera, Elisa; Becker, George D.; Bolton, James S.
- The Astrophysical Journal, Vol. 872, Issue 1
Anomaly in the Opacity of the Post-reionization Intergalactic Medium in the Ly α and Ly β Forest
journal, August 2019
- Eilers, Anna-Christina; Hennawi, Joseph F.; Davies, Frederick B.
- The Astrophysical Journal, Vol. 881, Issue 1
Evidence for Low Radiative Efficiency or Highly Obscured Growth of z > 7 Quasars
journal, October 2019
- Davies, Frederick B.; Hennawi, Joseph F.; Eilers, Anna-Christina
- The Astrophysical Journal, Vol. 884, Issue 1
New synthesis models of consistent extragalactic background light over cosmic time
text, January 2018
- Khaire, Vikram; Srianand, Raghunathan
- arXiv
Reionization in Technicolor
text, January 2018
- Finlator, Kristian; Keating, Laura; Oppenheimer, Benjamin D.
- arXiv
The Opacity of the Intergalactic Medium Measured Along Quasar Sightlines at $z\sim 6$
text, January 2018
- Eilers, Anna-Christina; Davies, Frederick B.; Hennawi, Joseph F.
- arXiv
Inhomogeneous Reionization Models in Cosmological Hydrodynamical Simulations
text, January 2018
- Oñorbe, Jose; Davies, F. B.; Lukić, Z.
- arXiv
Dark matter model favoured by reionization data: 7 keV sterile neutrino vs cold dark matter
text, January 2018
- Rudakovskyi, Anton; Iakubovskyi, Dmytro
- arXiv