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

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

Research output: Contribution to journalArticlepeer-review

117 Scopus citations


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
Issue number2 I
StatePublished - Sep 10 2006
Externally publishedYes


  • Cosmology: observations
  • Radio lines: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Improving foreground subtraction in statistical observations of 21 cm emission from the epoch of reionization'. Together they form a unique fingerprint.

Cite this