Figure 2: This image shows the galaxy MACSJ0416.1-2403, one of six clusters targeted by the Hubble Frontier Fields program. The varying intensity of the blue haze in this image is a mass map created by using new Hubble observations combined with the magnifying power of a process known as gravitational lensing. Strong lensing gives a much more precise indication of the mass at the cluster’s core, while weak lensing provides valuable information about the mass surrounding the cluster core. Credit: ESA/Hubble, NASA, HST Frontier Fields. Acknowledgement: Mathilde Jauzac (Durham University, UK and Astrophysics & Cosmology Research Unit, South Africa) and Jean-Paul Kneib (École Polytechnique Fédérale de Lausanne, Switzerland). (23.4 Mb TIFF or10.0 Mb JPEG)
An international team of astronomers, including Dr. Harald Ebeling of the University of Hawaii at Manoa Institute for Astronomy, has used the Hubble Space Telescope to map the mass within a galaxy cluster, originally discovered with Maunakea telescopes, more precisely than ever before.
Further investigations of MACSJ0416 are underway, combining the Frontier Fields images with deep X-ray observations of the hot gas within the cluster and with spectroscopic redshifts of the cluster galaxies, measured by Ebeling as part of the follow-up work conducted by the MACS team using Maunakea facilities. Primary goal: to deduce the merger history of this extreme cluster by establishing its three-dimensional geometry and the trajectories of the clusters involved in the collision.
Dr. Harald Ebeling
Dr. Roy Gal
cell: +1 301-728-8637
Ms. Louise Good