Most of the baryons in galaxies do not lie in stars or a gaseous disk. Much, ifnot all of these missing baryons are thought to lie in hot gaseous halos aroundgalaxies whose size defines the degree of feedback and the mass reservoir forfuture generations of star formation. X-ray studies of individual galaxiesindicate that the missing baryons are not contained within R200, but extend tolarger radii, signaling strong feedback effects. In conflict, the SZ signal fromstacks of galaxies implies that the missing baryons lie within R200. Thisconflict will be resolved in this program by determining the X-ray properties ofthe galaxies used for stacking to discover if the SZ signal is badlycontaminated by galaxy clusters and groups.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2019-10-04T11:01:57Z/2020-04-15T16:50:45Z
Version
18.02_20200221_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 Joel Bregman, 2021, 'Solving the Missing Baryons in Galaxies Problem', 18.02_20200221_1200, European Space Agency, https://doi.org/10.5270/esa-05sxu5y
