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Non-Gaussianity and direction-dependent systematics in HST Key Project data

Gupta, Shashikant and Saini, Tarun Deep (2011) Non-Gaussianity and direction-dependent systematics in HST Key Project data. In: Monthly Notices of the Royal Astronomical Society, 415 (3). pp. 2594-2599.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1365-...


Two new statistics, namely Delta(chi 2) and Delta(chi), 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 Delta(chi 2) show that the significance of direction-dependent systematics is restricted to well below the 1 sigma confidence limit; however, the presence of non-Gaussian features is subtle. On the other hand, the Delta(chi). 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 Delta(chi 2) statistic.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Keywords: methods;statistical;cosmological parameters
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 15 Sep 2011 11:00
Last Modified: 15 Sep 2011 11:00
URI: http://eprints.iisc.ac.in/id/eprint/40455

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