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Galaxy cluster surveys may help explain 'dark energy' in the universe (633 words) |
 | In particular, Mohr – in collaboration with John Carlstrom at the University of Chicago and scientists at the University of California and Harvard Smithsonian Center for Astrophysics – is studying the effect that hot electrons within galaxy clusters have on the cosmic microwave background, the afterglow of the big bang. |
| Galaxy clusters are filled with dark matter, galaxies and hot gas. |
| Such measurements, correlating galaxy cluster redshift distribution, structure and spatial distribution, should determine the equation of state of dark energy and, therefore, help define the essence of dark energy. |
| Extragalactic Astronomy / Cosmology (3629 words) |
| In such diagrams, the galaxy declination coordinate is ignored (or more properly stated, it is projected onto the plane of the diagram), the right ascension is used as the angular polar coordinate, and the galaxy redshift (interpreted as distance) is used as the radial coordinate. |
| We were granted the telescope time to measure galaxy redshifts, and in the era when Chincarini and Rood were publishing their Mayall plots, we had the clearly stated aim of mapping the 3D galaxy distribution in a swath of sky that stretched 21 degrees to the west of Coma. |
| Gregory, S.A. & Thompson, L.A. 1984,"The A2197 and A2199 Galaxy Clusters", Astrophys. |
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