منابع مشابه
Detection of Cosmic Shear with the William Herschel Telescope
Gravitational lensing by large-scale structure induces weak coherent alignments in the shapes of background galaxies. Here we present evidence for the detection of this ‘cosmic shear’ at the 3.4σ significance level with the William Herschel Telescope. Analysis and removal of notable systematic effects, such as shear induced by telescope optics and smearing by tracking and seeing, are conducted ...
متن کاملAn Enlarged Cosmic Shear Survey with the William Herschel Telescope
We report the results of a cosmic shear survey using the 4.2m William Herschel Telescope on La Palma, to a depth of R = 25.8 (zs ≈ 0.8), over 4 square degrees. The shear correlation functions are measured on scales from 1 to 15, and are used to constrain cosmological parameters. We ensure that our measurements are free from instrumental systematics, by performing a series of tests including an ...
متن کاملWilliam Pickles lecture 1989. Seeing sunflowers.
THE clearest memory I have from my first year as a medical student is of a botany practical. We had the task, one sunny Thursday afternoon, of cutting a very thin slice of a sunflower stem, putting it under the microscope and drawing what we saw. In the textbook there was an illustration of what we should expect to see: as I remember, it showed regular, neatly-'packed cells with several smaller...
متن کاملThe 2008 William M . Feinberg Lecture Prioritizing Stroke Research
Stroke is a tremendous burden to health worldwide both in the developed and developing world. Current levels of research funding do not adequately reflect this burden, particularly when expected increases in stroke rates are considered. Of course, an investment in stroke research is only justified if a return can be expected. The ultimate goal of stroke research is to reduce the burden of disea...
متن کاملThe 2008 William M. Feinberg lecture: prioritizing stroke research.
UNLABELLED Stroke is a tremendous burden to health worldwide both in the developed and developing world. Current levels of research funding do not adequately reflect this burden, particularly when expected increases in stroke rates are considered. Of course, an investment in stroke research is only justified if a return can be expected. The ultimate goal of stroke research is to reduce the burd...
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ژورنال
عنوان ژورنال: Astronomy & Geophysics
سال: 2001
ISSN: 1366-8781,1468-4004
DOI: 10.1093/astrog/42.1.1.6-a