|Title||XMM-Newton characterisation of missed extended galaxy groups in the RASS|
|Author||Prof Thomas Reiprich|
|Description||In Xu et al. (2018) we report the detection of very extended (r_500>15 arcmin) X- ray galaxy groups not included in any previous X-ray or SZ cluster catalogs. We select 4 of these groups whose X-ray fluxes are above the nominal flux-limits of previous RASS cluster catalogs (>3 x10^-12 erg s^-1 cm^-2 in the 0.1-2.4 keV energy band) to be followed up by XMM-Newton. They have low mass (virgul10^13 M_Sun), are at low redshift (z<0.08), and appear to exhibit flatter surface brightness distributions than usual. The XMM-Newton observations will allow us to determine the reasons why this potentially new class of objects has been missed in previous X-ray surveys and the impact on the sample incompleteness when using galaxy cluster counts for cosmology.|
|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, 2021-10-31T00:00:00Z, 086388, 18.02_20200221_1200. https://doi.org/10.57780/esa-epnuhu6|