|Title||A New Class of Massive Spiral Galaxies with High HI Masses|
|Author||Prof Joel Bregman|
|Description||The most extensive HI survey, obtained with Arecibo, revealed a new category of spiral galaxy in the local volume: massive spirals with a gaseous content comparable the stellar mass. These galaxies have high spin parameters, which may be slowing the conversion of gas into stars. The gaseous disks are regular, suggesting that they arise from a radiatively cooling hot galactic halo that is particularly massive and X-ray luminous. These may be local analogs to the active hot mode accretion process that was common at z virgul 1-3 but is rare today. We propose the first X-ray observations of this newly recognized class of galaxies.|
|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, 2018-01-04T23:00:00Z, 078235, 17.56_20190403_1200. https://doi.org/10.5270/esa-g9uvfnm|