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Title: The Signature of Patchy Reionization in the Polarization Anisotropy of the CMB

Abstract

The inhomogeneous ionization state of the universe when the first sources of ionizing radiation appeared should lead to anisotropies in the polarization of the cosmic microwave background. We use cosmological simulations of the process by which the first sources ionized the intergalactic medium to study the induced polarization anisotropies. We find that the polarization anisotropies have rms of order {approx} 0.01 {mu}K, and local peak values of {approx} 0.1 {mu}K, smaller than those due to gravitational lensing on small scales. The polarization direction is highly coherent over degree scales. This directional coherence is not expected from either primary anisotropy or gravitational lensing effects, making the largest signals due to inhomogeneous ionization relatively easy to isolate, should experiments achieve the necessary very low noise levels.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
907721
Report Number(s):
SLAC-PUB-12515
astro-ph/0701784; TRN: US200721%%519
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Submitted to Phys.Rev.D
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; IONIZATION; IONIZING RADIATIONS; POLARIZATION; RELICT RADIATION; UNIVERSE; Astrophysics,ASTRO

Citation Formats

Dore, Olivier, /Canadian Inst. Theor. Astrophys., Holder, Gil, /McGill U., Alvarez, Marcelo, /KIPAC, Menlo Park, Iliev, Ilian T., /Canadian Inst. Theor. Astrophys., Mellema, Garrelt, /Stockholm Observ., Pen, Ue-Li, /Canadian Inst. Theor. Astrophys., Shapiro, Paul R., and /Texas U., Astron. Dept. The Signature of Patchy Reionization in the Polarization Anisotropy of the CMB. United States: N. p., 2007. Web. doi:10.1103/PhysRevD.76.043002.
Dore, Olivier, /Canadian Inst. Theor. Astrophys., Holder, Gil, /McGill U., Alvarez, Marcelo, /KIPAC, Menlo Park, Iliev, Ilian T., /Canadian Inst. Theor. Astrophys., Mellema, Garrelt, /Stockholm Observ., Pen, Ue-Li, /Canadian Inst. Theor. Astrophys., Shapiro, Paul R., & /Texas U., Astron. Dept. The Signature of Patchy Reionization in the Polarization Anisotropy of the CMB. United States. doi:10.1103/PhysRevD.76.043002.
Dore, Olivier, /Canadian Inst. Theor. Astrophys., Holder, Gil, /McGill U., Alvarez, Marcelo, /KIPAC, Menlo Park, Iliev, Ilian T., /Canadian Inst. Theor. Astrophys., Mellema, Garrelt, /Stockholm Observ., Pen, Ue-Li, /Canadian Inst. Theor. Astrophys., Shapiro, Paul R., and /Texas U., Astron. Dept. Wed . "The Signature of Patchy Reionization in the Polarization Anisotropy of the CMB". United States. doi:10.1103/PhysRevD.76.043002. https://www.osti.gov/servlets/purl/907721.
@article{osti_907721,
title = {The Signature of Patchy Reionization in the Polarization Anisotropy of the CMB},
author = {Dore, Olivier and /Canadian Inst. Theor. Astrophys. and Holder, Gil and /McGill U. and Alvarez, Marcelo and /KIPAC, Menlo Park and Iliev, Ilian T. and /Canadian Inst. Theor. Astrophys. and Mellema, Garrelt and /Stockholm Observ. and Pen, Ue-Li and /Canadian Inst. Theor. Astrophys. and Shapiro, Paul R. and /Texas U., Astron. Dept.},
abstractNote = {The inhomogeneous ionization state of the universe when the first sources of ionizing radiation appeared should lead to anisotropies in the polarization of the cosmic microwave background. We use cosmological simulations of the process by which the first sources ionized the intergalactic medium to study the induced polarization anisotropies. We find that the polarization anisotropies have rms of order {approx} 0.01 {mu}K, and local peak values of {approx} 0.1 {mu}K, smaller than those due to gravitational lensing on small scales. The polarization direction is highly coherent over degree scales. This directional coherence is not expected from either primary anisotropy or gravitational lensing effects, making the largest signals due to inhomogeneous ionization relatively easy to isolate, should experiments achieve the necessary very low noise levels.},
doi = {10.1103/PhysRevD.76.043002},
journal = {Submitted to Phys.Rev.D},
number = ,
volume = ,
place = {United States},
year = {Wed May 16 00:00:00 EDT 2007},
month = {Wed May 16 00:00:00 EDT 2007}
}