We propose an XMM study of 7 galaxy groups with similar velocity dispersions andrichness detected in UV absorption with HST/COS. X-ray thermal emission and UVabsorption-line diagnostics provide a new method for probing the intra-groupmedium and locating missing baryons . All 7 groups have broad HI Ly-alphaabsorption lines detected by HST-COS, half of which were also detected in OVI.By observing the 5 lacking XMM observations, we will determine whether thethermodynamic state (T, density, entropy) and metallicity of the hottest baryonscan shed light on why some systems have OVI and some do not. The state of hotgas and OVI in simulations depend significantly on feedback, halo mergers andstar formation history, so these observations will provide critical tests of simulations.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2019-01-14T04:17:53Z/2019-01-14T10:24:33Z
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 Megan Donahue, 2020, 'Hot Gas in Low Redshift comma Massive SQUARE_BRACKET_OPENOVISQUARE_BRACKET_CLOSE Lyman Alpha Absorption Line Systems', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-5w5agr7
