The SLACS collaboration measured the dark matter halos of elliptical galaxies onscales from 1 to 100 kpc, using a combination of lensing (strong and weak) andstellar dynamics. This provides new tests of the standard cosmological models atgalaxy/group scales. However, lensing can only measure the total projected massalong the line of sight, and therefore can be affected by large-scale structuresin projection. We propose to observe a complete subset of SLACS lenses toidentify nearby groups and clusters, determine their location, temperature, andmass and study the dependency of halo profiles on the local environment,expected because of tidal interactions. The selected low redshift (average 0.13)lens sample is ideal for an X-ray investigation at galaxy/group scales.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2009-11-15T03:39:17Z/2010-04-15T22:48:58Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Prof Tommaso Treu, 2011, 'X-raying strong gravitational lenses: dark halos and the environment', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-j52iyra
