Galaxy cluster outskirts are the regions where structure formation occursthrough the accretion of smaller structures along large-scale filaments.Recently, it has been claimed both from observations and numerical simulationsthat an important fraction of the infalling material should be in the form ofdense clumps. Unfortunately, the observation of the Hydra A SE field, which iscrucial for the completion of our program for the study of gas clumping acceptedin AO-11, was badly affected by soft proton flares. This field is located alonga filament, and already allowed us to unveil the presence of accretingsubstructures. Therefore, we ask for a re-observation of this crucial field withXMM, to allow the completion of our AO-11 program.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2013-11-02T21:02:19Z/2013-11-03T05:38:59Z
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, Dr Dominique Eckert, 2014, 'Re-observation of Hydra A SE', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-99hqnlx
