|Title||Galactic Fountains, Galaxy Infall, and the Dark Matter Content of NGC 891|
|Author||Prof Joel Bregman|
|Description||We address two galaxy formation issues by studying the hot gas around the edge-on spiral NGC891. The primary issue is the origin of the hot halo, which can occur by infall onto the galaxy or from a galactic fountain generated by disk SNe. We differentiate between models by measuring the gas metallicity, predicted to be low in one model and high in the other. Second, we will measure the vertical component of the galaxy.s gravitational field, thereby lifting a degeneracy in mass models and permitting a unique determination of the dark matter density in the baryon-dominated region. We accomplish this by measuring the temperature and emission measure distribution perpendicular to the disk. Existing data prove feasibility but are not sufficiently deep.|
|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, 2012-09-20T00:00:00Z, 067095, 17.56_20190403_1200. https://doi.org/10.5270/esa-80y5p6k|