A cross-correlation analysis of WMAP and egret data in wavelet space

Xin Liu; Shuang Nan Zhang

doi:10.1086/499804

A cross-correlation analysis of WMAP and egret data in wavelet space

Xin Liu
, Shuang Nan Zhang

Research output: Contribution to journal › Article › peer-review

Abstract

We cross-correlate the first-year Wilkinson Microwave Anisotropy Probe (WMAP) data and the diffuse gamma-ray intensity maps from the Energetic Gamma-Ray Experiment Telescope (EGRET) using spherical-wavelet approaches. Correlations at the 99.7% significance level have been detected, at scales around 15° in the WMAP foreground-cleaned W-band and Q-band maps, based on data from regions that are outside the most conservative WMAP foreground mask; no significant correlation is found with the Tegmark cleaned map. The detected correlation is most likely of Galactic origin and thus can help probe the origins of possible Galactic foreground residuals and ultimately remove them from measured microwave sky maps.

Original language	English (US)
Pages (from-to)	L1-L4
Journal	Astrophysical Journal
Volume	636
Issue number	1 II
DOIs	https://doi.org/10.1086/499804
State	Published - Jan 1 2006
Externally published	Yes

Keywords

Cosmic microwave background
Cosmic rays
Diffuse radiation
Methods: data analysis

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Online availability

10.1086/499804

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title = "A cross-correlation analysis of WMAP and egret data in wavelet space",

abstract = "We cross-correlate the first-year Wilkinson Microwave Anisotropy Probe (WMAP) data and the diffuse gamma-ray intensity maps from the Energetic Gamma-Ray Experiment Telescope (EGRET) using spherical-wavelet approaches. Correlations at the 99.7\% significance level have been detected, at scales around 15° in the WMAP foreground-cleaned W-band and Q-band maps, based on data from regions that are outside the most conservative WMAP foreground mask; no significant correlation is found with the Tegmark cleaned map. The detected correlation is most likely of Galactic origin and thus can help probe the origins of possible Galactic foreground residuals and ultimately remove them from measured microwave sky maps.",

keywords = "Cosmic microwave background, Cosmic rays, Diffuse radiation, Methods: data analysis",

author = "Xin Liu and Zhang, \{Shuang Nan\}",

note = "We are very grateful to the anonymous referees, whose comments and suggestions allowed us to clarify several issues and improve the readability of this Letter. We acknowledge the use of the Legacy Archive for Microwave Background Data Analysis, which is supported by the NASA Office of Space Science; the YAWtb toolbox, developed by A. Coron, L. Jacques, A. Rivoldini, and P. Vandergheynst; and the software packages HEALPix, developed by K. M. G{\'o}rski, E. F. Hivon, B. D. Wandelt, J. Banday, F. K. Hansen, and M. Barthelmann, and CMBFAST, developed by U. Seljak and M. Zaldarriaga. This study is supported in part by the Special Funds for Major State Basic Research Projects, by the Directional Research Project of the Chinese Academy of Sciences, and by the National Natural Science Foundation of China. S.-N. Z. also acknowledges partial funding support from the NASA Long-Term Space Astrophysics Program.",

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doi = "10.1086/499804",

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AU - Liu, Xin

AU - Zhang, Shuang Nan

N1 - We are very grateful to the anonymous referees, whose comments and suggestions allowed us to clarify several issues and improve the readability of this Letter. We acknowledge the use of the Legacy Archive for Microwave Background Data Analysis, which is supported by the NASA Office of Space Science; the YAWtb toolbox, developed by A. Coron, L. Jacques, A. Rivoldini, and P. Vandergheynst; and the software packages HEALPix, developed by K. M. Górski, E. F. Hivon, B. D. Wandelt, J. Banday, F. K. Hansen, and M. Barthelmann, and CMBFAST, developed by U. Seljak and M. Zaldarriaga. This study is supported in part by the Special Funds for Major State Basic Research Projects, by the Directional Research Project of the Chinese Academy of Sciences, and by the National Natural Science Foundation of China. S.-N. Z. also acknowledges partial funding support from the NASA Long-Term Space Astrophysics Program.

PY - 2006/1/1

Y1 - 2006/1/1

N2 - We cross-correlate the first-year Wilkinson Microwave Anisotropy Probe (WMAP) data and the diffuse gamma-ray intensity maps from the Energetic Gamma-Ray Experiment Telescope (EGRET) using spherical-wavelet approaches. Correlations at the 99.7% significance level have been detected, at scales around 15° in the WMAP foreground-cleaned W-band and Q-band maps, based on data from regions that are outside the most conservative WMAP foreground mask; no significant correlation is found with the Tegmark cleaned map. The detected correlation is most likely of Galactic origin and thus can help probe the origins of possible Galactic foreground residuals and ultimately remove them from measured microwave sky maps.

AB - We cross-correlate the first-year Wilkinson Microwave Anisotropy Probe (WMAP) data and the diffuse gamma-ray intensity maps from the Energetic Gamma-Ray Experiment Telescope (EGRET) using spherical-wavelet approaches. Correlations at the 99.7% significance level have been detected, at scales around 15° in the WMAP foreground-cleaned W-band and Q-band maps, based on data from regions that are outside the most conservative WMAP foreground mask; no significant correlation is found with the Tegmark cleaned map. The detected correlation is most likely of Galactic origin and thus can help probe the origins of possible Galactic foreground residuals and ultimately remove them from measured microwave sky maps.

KW - Cosmic microwave background

KW - Cosmic rays

KW - Diffuse radiation

KW - Methods: data analysis

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A cross-correlation analysis of WMAP and egret data in wavelet space

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