Giant galaxy cluster Abell 2744 observed by Hubble

Image credit: Hubble’s Frontier Fields observing program, NASA, ESA, and J. Lotz, M. Mountain, A. Koekemoer, the HFF Team (STScI) and and N. Laporte (Instituto de Astrofisica de Canarias).

Abell 2744 lies approximately 1.2 gigaparsecs distant in the constellation of Sculptor, and is thought to be the result of a merger of at least four smaller clusters of galaxies over a period of 350 Myr. Recently, the Hubble Frontier Fields program has revealed one of the youngest galaxies so far observed, at a redshift z ~ 8. In another recent development the neutrino mass has been accurately measured for the first time:

Dr Adam Moss (University of Nottingham) and Professor Richard Battye from The University of Manchester have combined the data from Planck with gravitational lensing observations in which images of galaxies are warped by the curvature of space-time. They conclude that the current discrepancies can be resolved if massive neutrinos are included in the standard cosmological model. They estimate that the sum of masses of neutrinos is 0.320 +/- 0.081 eV (assuming active neutrinos with three flavors).

The paper is “Evidence for Massive Neutrinos from Cosmic Microwave Background and Lensing Observations,” Phys. Rev. Lett., 112, 051303, 2014; DOI:10.1103/PhysRevLett.112.051303


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