The most extensive HI survey, obtained with Arecibo, revealed a new category ofspiral galaxy in the local volume: massive spirals with a gaseous contentcomparable the stellar mass. These galaxies have high spin parameters, which maybe slowing the conversion of gas into stars. The gaseous disks are regular,suggesting that they arise from a radiatively cooling hot galactic halo that isparticularly massive and X-ray luminous. These may be local analogs to theactive 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 ofgalaxies.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2016-11-26T12:50:00Z/2016-12-05T01:07:23Z
Version
17.56_20190403_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, 2018, 'A New Class of Massive Spiral Galaxies with High HI Masses', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-g9uvfnm
