Improving foreground subtraction in statistical observations of 21 cm emission from the epoch of reionization

Miguel F. Morales, Judd Bowman, Jacqueline N. Hewitt

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

Statistical observations of the epoch of reionization using the 21 cm line of neutral hydrogen have the potential to revolutionize our understanding of structure formation and the first luminous objects. However, these observations are complicated by a host of strong foreground sources. Several foreground-removal techniques have been proposed in the literature, and it has been assumed that these would be used in combination to reveal the epoch of reionization (EOR) signal. By studying the characteristic subtraction errors of the proposed foreground-removal techniques, we identify an additional subtraction stage that can further reduce the EOR foreground contamination, and study the interactions between the foreground-removal algorithms. This enables us to outline a comprehensive foreground-removal strategy that incorporates all previously proposed subtraction techniques. Using this foreground-removal framework and the characteristic subtraction errors, we discuss the complementarity of different foreground-removal techniques and the implications for array design and the analysis of EOR data.

Original languageEnglish (US)
Pages (from-to)767-773
Number of pages7
JournalAstrophysical Journal
Volume648
Issue number2 I
DOIs
StatePublished - Sep 10 2006
Externally publishedYes

Fingerprint

subtraction
time measurement
design analysis
complementarity
removal
contamination
hydrogen
interactions

Keywords

  • Cosmology: observations
  • Radio lines: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Improving foreground subtraction in statistical observations of 21 cm emission from the epoch of reionization. / Morales, Miguel F.; Bowman, Judd; Hewitt, Jacqueline N.

In: Astrophysical Journal, Vol. 648, No. 2 I, 10.09.2006, p. 767-773.

Research output: Contribution to journalArticle

@article{18fd293b616b47fd93f7a417b446cabe,
title = "Improving foreground subtraction in statistical observations of 21 cm emission from the epoch of reionization",
abstract = "Statistical observations of the epoch of reionization using the 21 cm line of neutral hydrogen have the potential to revolutionize our understanding of structure formation and the first luminous objects. However, these observations are complicated by a host of strong foreground sources. Several foreground-removal techniques have been proposed in the literature, and it has been assumed that these would be used in combination to reveal the epoch of reionization (EOR) signal. By studying the characteristic subtraction errors of the proposed foreground-removal techniques, we identify an additional subtraction stage that can further reduce the EOR foreground contamination, and study the interactions between the foreground-removal algorithms. This enables us to outline a comprehensive foreground-removal strategy that incorporates all previously proposed subtraction techniques. Using this foreground-removal framework and the characteristic subtraction errors, we discuss the complementarity of different foreground-removal techniques and the implications for array design and the analysis of EOR data.",
keywords = "Cosmology: observations, Radio lines: galaxies",
author = "Morales, {Miguel F.} and Judd Bowman and Hewitt, {Jacqueline N.}",
year = "2006",
month = "9",
day = "10",
doi = "10.1086/506135",
language = "English (US)",
volume = "648",
pages = "767--773",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 I",

}

TY - JOUR

T1 - Improving foreground subtraction in statistical observations of 21 cm emission from the epoch of reionization

AU - Morales, Miguel F.

AU - Bowman, Judd

AU - Hewitt, Jacqueline N.

PY - 2006/9/10

Y1 - 2006/9/10

N2 - Statistical observations of the epoch of reionization using the 21 cm line of neutral hydrogen have the potential to revolutionize our understanding of structure formation and the first luminous objects. However, these observations are complicated by a host of strong foreground sources. Several foreground-removal techniques have been proposed in the literature, and it has been assumed that these would be used in combination to reveal the epoch of reionization (EOR) signal. By studying the characteristic subtraction errors of the proposed foreground-removal techniques, we identify an additional subtraction stage that can further reduce the EOR foreground contamination, and study the interactions between the foreground-removal algorithms. This enables us to outline a comprehensive foreground-removal strategy that incorporates all previously proposed subtraction techniques. Using this foreground-removal framework and the characteristic subtraction errors, we discuss the complementarity of different foreground-removal techniques and the implications for array design and the analysis of EOR data.

AB - Statistical observations of the epoch of reionization using the 21 cm line of neutral hydrogen have the potential to revolutionize our understanding of structure formation and the first luminous objects. However, these observations are complicated by a host of strong foreground sources. Several foreground-removal techniques have been proposed in the literature, and it has been assumed that these would be used in combination to reveal the epoch of reionization (EOR) signal. By studying the characteristic subtraction errors of the proposed foreground-removal techniques, we identify an additional subtraction stage that can further reduce the EOR foreground contamination, and study the interactions between the foreground-removal algorithms. This enables us to outline a comprehensive foreground-removal strategy that incorporates all previously proposed subtraction techniques. Using this foreground-removal framework and the characteristic subtraction errors, we discuss the complementarity of different foreground-removal techniques and the implications for array design and the analysis of EOR data.

KW - Cosmology: observations

KW - Radio lines: galaxies

UR - http://www.scopus.com/inward/record.url?scp=33750466968&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33750466968&partnerID=8YFLogxK

U2 - 10.1086/506135

DO - 10.1086/506135

M3 - Article

AN - SCOPUS:33750466968

VL - 648

SP - 767

EP - 773

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 I

ER -