|Title||Most of the Baryons in Galaxies|
|Author||Prof JOEL BREGMAN|
|Description||Galaxies are missing most of their baryons when compared to the cosmological baryon to dark matter ratio. The Milky Way is missing 2-3 of its baryons and less massive galaxies have retained less than 10% of their baryons. Theory suggests that these baryons were expelled by intense galactic winds during the primary star formation period. These galactic winds carry gas far beyond the virial radius of small and modest galaxies, but the most massive galaxies should retain much of this material. e propose to test this picture by searching for the missing baryons surrounding the most massive spiral galaxy, UGC 12591, a fairly isolated galaxy with a rotational velocity of almost 500 km-sec. If successful, we will detect a significant fraction of the 5E11 Msun of its missing baryons.|
|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, 2010-01-17T00:00:00Z, 055387, 17.56_20190403_1200. https://doi.org/10.5270/esa-312e3zk|