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Non-Gaussianity and direction-dependent systematics in HST Key Project data
Gupta, Shashikant; Saini, Tarun Deep
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…
Bridging model and observed stellar spectra
Allende Prieto, C.
Accurate model stellar fluxes are key for the analysis of observations of individual stars or stellar populations. Model spectra differ from real stellar spectra due to limitations of the input physical data and adopted simplifications, but can be empirically calibrated to maximize their resemblance to actual stellar spectra. We describe a least-s…
Oxford SWIFT integral field spectrograph and multiwavelength observations of the Eagle galaxy at z= 0.77
Weiner, Benjamin J.; Koekemoer, A. M.; Salim, Samir +17 more
The ‘Eagle' galaxy at a redshift of 0.77 is studied with the Oxford Short Wavelength Integral Field Spectrograph (SWIFT) and multiwavelength data from the All-wavelength Extended Groth strip International Survey (AEGIS). It was chosen from AEGIS because of the bright and extended emission in its slit spectrum. 3D kinematic maps of the Eagle reveal…
Updated Phoebe's orbit
Zhang, H. Y.; Qiao, R. C.; Shen, K. X. +4 more
In recent years, many new CCD observations of Phoebe, the ninth Saturnian satellite, were published. In this paper, we have used all the observations of Phoebe available until 2009 to update Phoebe's orbit. These observations represent a total number of 2994 positions, spread over a time-interval of 105 years, from 1904 to 2009. The accuracy of th…