We recently published a Suzaku study of poor cluster ESOvirgul3060170 out to itsvirial radius. Its entropy profiles are flatter than expected from purelygravitational processes, as also seen massive clusters, perhaps being due toclumpy gas. The baryon fraction of this system is 0.13 within its Rvir, muchsmaller than the cosmic value. The flux of the CXB exceeds that of hot gas inthe outskirt; we need higher quality observations to resolve out much of theCXB. We propose two orthogonal XMM pointings out to Rvir, in order to mitigatepoint sources and attain a complete azimuthal coverage. If the entropy behavioris verified, it will imply that clumpy gas occurs down to the scale of galaxygroups, and groups can have significantly smaller baryon fraction than clusters.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2014-09-25T17:37:09Z/2014-10-31T06:00:54Z
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 Yuanyuan Su, 2015, 'Optimally Mapping a Poor Cluster to its Virial Radius with XMM-Newton', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-iptbmem
