Journal Article

Non-Gaussianity and direction-dependent systematics in <i>HST</i> Key Project data

Shashikant Gupta and Tarun Deep Saini

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 3, pages 2594-2599
Published in print August 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18882.x
Non-Gaussianity and direction-dependent systematics in HST Key Project data

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Two new statistics, namely Δ and Δχ, based on the extreme value theory, were derived by Gupta et al. We use these statistics to study the direction dependence in the HST Key Project data, which provides one of the most precise measurements of the Hubble constant. We also study the non-Gaussianity in this data set using these statistics. Our results for Δ show that the significance of direction-dependent systematics is restricted to well below the 1σ confidence limit; however, the presence of non-Gaussian features is subtle. On the other hand, the Δχ statistic, which is more sensitive to direction dependence, shows direction dependence systematics to be at a slightly higher confidence level, and the presence of non-Gaussian features at a level similar to the Δ statistic.

Keywords: methods: statistical; cosmological parameters

Journal Article.  4209 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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