skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Does Planck 2015 polarization data favor high redshift reionization?

Abstract

Here, we study the relationship between signatures of high redshift ionization in large-angle CMB polarization power spectra and features in the Planck 2015 data. Using a principal component (PC) ionization basis that is complete to the cosmic variance limit out to z max= 30,40,50, we find a robust > 95% CL preference for ionization at z >15 with no preference for z >40. This robustness originates from the $$\ell$$ ~10 region of the data which show high power relative to $$\ell$$ ≤ 8 and result in a poor fit to a steplike model of reionization. Instead, by allowing for high redshift reionization, the PCs provide a better fit by 2Δ ln $$\mathscr{L}$$ = 5-6. Due to a degeneracy in the ionization redshift response, this improved fit is due to a single aspect of the model: the ability to accommodate z >10 component to the ionization as we illustrate with a two-step reionization model. For this and other models thataccommodate such a component, its presence is allowed and even favored; for models that do not,their poor fit reflects statistical or systematic fluctuations. These possibilities produce very different and testable predictions at $$\ell$$ ~15-20, as well as small but detectable differences at $$\ell$$ >30 thatcan further restrict the high redshift limit of reionization

Authors:
 [1];  [2]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
  2. Univ. of Chicago, IL (United States). Enrico Fermi Inst., Kavli Inst. for Cosmological Physics
Publication Date:
Research Org.:
Univ. of Chicago, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); Simons Foundation; National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1594043
Alternate Identifier(s):
OSTI ID: 1469741
Grant/Contract Number:  
SC0009924; FG02-13ER41958
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 98; Journal Issue: 6; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Heinrich, Chen, and Hu, Wayne. Does Planck 2015 polarization data favor high redshift reionization?. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.063514.
Heinrich, Chen, & Hu, Wayne. Does Planck 2015 polarization data favor high redshift reionization?. United States. doi:10.1103/PhysRevD.98.063514.
Heinrich, Chen, and Hu, Wayne. Wed . "Does Planck 2015 polarization data favor high redshift reionization?". United States. doi:10.1103/PhysRevD.98.063514. https://www.osti.gov/servlets/purl/1594043.
@article{osti_1594043,
title = {Does Planck 2015 polarization data favor high redshift reionization?},
author = {Heinrich, Chen and Hu, Wayne},
abstractNote = {Here, we study the relationship between signatures of high redshift ionization in large-angle CMB polarization power spectra and features in the Planck 2015 data. Using a principal component (PC) ionization basis that is complete to the cosmic variance limit out to zmax= 30,40,50, we find a robust > 95% CL preference for ionization at z >15 with no preference for z >40. This robustness originates from the $\ell$ ~10 region of the data which show high power relative to $\ell$ ≤ 8 and result in a poor fit to a steplike model of reionization. Instead, by allowing for high redshift reionization, the PCs provide a better fit by 2Δ ln $\mathscr{L}$ = 5-6. Due to a degeneracy in the ionization redshift response, this improved fit is due to a single aspect of the model: the ability to accommodate z >10 component to the ionization as we illustrate with a two-step reionization model. For this and other models thataccommodate such a component, its presence is allowed and even favored; for models that do not,their poor fit reflects statistical or systematic fluctuations. These possibilities produce very different and testable predictions at $\ell$ ~15-20, as well as small but detectable differences at $\ell$ >30 thatcan further restrict the high redshift limit of reionization},
doi = {10.1103/PhysRevD.98.063514},
journal = {Physical Review D},
number = 6,
volume = 98,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Towards a cosmological neutrino mass detection
journal, December 2015


A Projected Estimate of the Reionization Optical Depth Using the CLASS Experiment’s Sample Variance Limited E-mode Measurement
journal, August 2018

  • Watts, Duncan J.; Wang, Bingjie; Ali, Aamir
  • The Astrophysical Journal, Vol. 863, Issue 2
  • DOI: 10.3847/1538-4357/aad283

Model‐Independent Constraints on Reionization from Large‐Scale Cosmic Microwave Background Polarization
journal, January 2008

  • Mortonson, Michael J.; Hu, Wayne
  • The Astrophysical Journal, Vol. 672, Issue 2
  • DOI: 10.1086/523958

Detecting the rise and fall of the First Stars by Their Impact on Cosmic Reionization
journal, August 2012


Was there an early reionization component in our universe?
journal, April 2018

  • Villanueva-Domingo, Pablo; Gariazzo, Stefano; Gnedin, Nickolay Y.
  • Journal of Cosmology and Astroparticle Physics, Vol. 2018, Issue 04
  • DOI: 10.1088/1475-7516/2018/04/024

Planck 2015 results : XI. CMB power spectra, likelihoods, and robustness of parameters
journal, September 2016


Witnessing the reionization history using Cosmic Microwave Background observation from Planck
journal, November 2017


CMB signatures of metal-free star formation and Planck 2015 polarization data
journal, February 2017

  • Miranda, Vinicius; Lidz, Adam; Heinrich, Chen He
  • Monthly Notices of the Royal Astronomical Society, Vol. 467, Issue 4
  • DOI: 10.1093/mnras/stx306

Inflationary versus reionization features from Planck 2015 data
journal, August 2018


Planck 2015 results : XIII. Cosmological parameters
journal, September 2016


Cosmological information from lensed CMB power spectra
journal, December 2006


Cosmological parameters from CMB and other data: A Monte Carlo approach
journal, November 2002


Complete reionization constraints from Planck 2015 polarization
journal, January 2017


Efficient Computation of Cosmic Microwave Background Anisotropies in Closed Friedmann‐Robertson‐Walker Models
journal, August 2000

  • Lewis, Antony; Challinor, Anthony; Lasenby, Anthony
  • The Astrophysical Journal, Vol. 538, Issue 2
  • DOI: 10.1086/309179

CMB power spectrum parameter degeneracies in the era of precision cosmology
journal, April 2012

  • Howlett, Cullan; Lewis, Antony; Hall, Alex
  • Journal of Cosmology and Astroparticle Physics, Vol. 2012, Issue 04
  • DOI: 10.1088/1475-7516/2012/04/027

Reionisation and High-Redshift Galaxies: The View from Quasar Absorption Lines
journal, January 2015

  • Becker, George D.; Bolton, James S.; Lidz, Adam
  • Publications of the Astronomical Society of Australia, Vol. 32
  • DOI: 10.1017/pasa.2015.45

Model-independent reionization observables in the CMB
journal, July 2003


Reionization Constraints from Five-Year WMAP Data
journal, September 2008

  • Mortonson, Michael J.; Hu, Wayne
  • The Astrophysical Journal, Vol. 686, Issue 2
  • DOI: 10.1086/593031

CMB polarization features from inflation versus reionization
journal, May 2009


Efficient sampling of fast and slow cosmological parameters
journal, May 2013


Detection of extended He ii reionization in the temperature evolution of the intergalactic medium★: IGM temperatures over 2 < z < 5
journal, November 2010

  • Becker, George D.; Bolton, James S.; Haehnelt, Martin G.
  • Monthly Notices of the Royal Astronomical Society, Vol. 410, Issue 2
  • DOI: 10.1111/j.1365-2966.2010.17507.x

Evidence for horizon-scale power from CMB polarization
journal, July 2009


Joint galaxy-lensing observables and the dark energy
journal, August 2004