Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-15
Phys.Rev. D69 (2004) 083524
Astronomy and Astrophysics
Astrophysics
35 pages (preprint format), 8 figures. In addition to minor revisions based on referee's comments, after correcting for a bug
Scientific paper
10.1103/PhysRevD.69.083524
We cross-correlate the Cosmic Microwave Background (CMB) temperature anisotropies observed by the Wilkinson Microwave Anisotropy Probe (WMAP) with the projected distribution of extended sources in the Two Micron All Sky Survey (2MASS). By modelling the theoretical expectation for this signal, we extract the signatures of dark energy (Integrated Sachs-Wolfe effect;ISW), hot gas (thermal Sunyaev-Zeldovich effect;thermal SZ), and microwave point sources in the cross-correlation. Our strongest signal is the thermal SZ, at the 3.1-3.7 \sigma level, which is consistent with the theoretical prediction based on observations of X-ray clusters. We also see the ISW signal at the 2.5 \sigma level, which is consistent with the expected value for the concordance LCDM cosmology, and is an independent signature of the presence of dark energy in the universe. Finally, we see the signature of microwave point sources at the 2.7 \sigma level.
Afshordi Niayesh
Loh Yeong-Shang
Strauss Michael A.
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