|Title||Optimally Mapping a Poor Cluster to its Virial Radius with XMM-Newton|
|Author||Dr Yuanyuan Su|
|Description||We recently published a Suzaku study of poor cluster ESOvirgul3060170 out to its virial radius. Its entropy profiles are flatter than expected from purely gravitational processes, as also seen massive clusters, perhaps being due to clumpy gas. The baryon fraction of this system is 0.13 within its Rvir, much smaller than the cosmic value. The flux of the CXB exceeds that of hot gas in the outskirt; we need higher quality observations to resolve out much of the CXB. We propose two orthogonal XMM pointings out to Rvir, in order to mitigate point sources and attain a complete azimuthal coverage. If the entropy behavior is verified, it will imply that clumpy gas occurs down to the scale of galaxy groups, and groups can have significantly smaller baryon fraction than clusters.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2015-11-13T23:00:00Z, 074394, 17.56_20190403_1200. https://doi.org/10.5270/esa-iptbmem|