Publication Abstracts

Chiang et al. 2003

Chiang, L.-Y., P.D. Naselsky, O.V. Verkhodanov, and M.J. Way, 2003: Non-Gaussianity of the derived maps from the first-year Wilkinson Microwave Anisotropy Probe data. Astrophys. J., 590, L65-L68, doi:10.1086/376822.

We present non-Gaussianity testing on derived maps from the recently released first-year Wilkinson Microwave Anisotropy Probe data by Tegmark, de Oliveria-Costa, & Hamilton. Our test is based on a phase-mapping technique that has the advantage of testing non-Gaussianity at separate multipole bands. We show that their foreground-cleaned map is against the random-phase hypothesis at all four multipole bands centered around l = 150, 290, 400, and 500. Their Wiener-filtered map, on the other hand, is Gaussian for l < 250 and marginally Gaussian for 224 < l < 350. However, we see the evidence of non-Gaussianity for l > 350 as we detect certain degrees of phase coupling, hence against the random-phase hypothesis. Our phase-mapping technique is particularly useful for testing the accuracy of component separation methods.

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BibTeX Citation

@article{ch06800b,
  author={Chiang, L.-Y. and Naselsky, P. D. and Verkhodanov, O. V. and Way, M. J.},
  title={Non-Gaussianity of the derived maps from the first-year Wilkinson Microwave Anisotropy Probe data},
  year={2003},
  journal={Astrophys. J.},
  volume={590},
  pages={L65--L68},
  doi={10.1086/376822},
}

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RIS Citation

TY  - JOUR
ID  - ch06800b
AU  - Chiang, L.-Y.
AU  - Naselsky, P. D.
AU  - Verkhodanov, O. V.
AU  - Way, M. J.
PY  - 2003
TI  - Non-Gaussianity of the derived maps from the first-year Wilkinson Microwave Anisotropy Probe data
JA  - Astrophys. J.
VL  - 590
SP  - L65
EP  - L68
DO  - 10.1086/376822
ER  -

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