|Title||Hot Gas in Low Redshift, Massive [OVI] Lyman Alpha Absorption Line Systems|
|Author||Prof Megan Donahue|
|Description||We propose an XMM study of 7 galaxy groups with similar velocity dispersions and richness detected in UV absorption with HST-COS. X-ray thermal emission and UV absorption-line diagnostics provide a new method for probing the intra-group medium and locating missing baryons . All 7 groups have broad HI Ly-alpha absorption lines detected by HST-COS, half of which were also detected in OVI. By observing the 5 lacking XMM observations, we will determine whether the thermodynamic state (T, density, entropy) and metallicity of the hottest baryons can shed light on why some systems have OVI and some do not. The state of hot gas and OVI in simulations depend significantly on feedback, halo mergers and star formation history, so these observations will provide critical tests of simulations.|
|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, 2020-02-05T23:00:00Z, 082024, 17.56_20190403_1200. https://doi.org/10.5270/esa-5w5agr7|