Dragonfly 44 is an ultra-diffuse galaxy with a stellar mass of only 3e8 Msun buta dynamical mass of 1e12 Msun and about 100 globular clusters. This suggeststhat it is a central galaxy that somehow lost its gas, rather than a strippedsatellite. We propose measuring the amount of hot gas, which is the primarysource of fuel for star formation in galaxies of this size, as well as itspresent-day star formation rate and number of low-mass X-ray binaries. Thesewill provide important clues to the nature of Dragonfly 44 and the thousands ofother known ultra-diffuse galaxies.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2017-12-23T07:06:29Z/2018-01-05T06:29:47Z
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, Mr Edmund Hodges-Kluck, 2019, 'Dragonfly 44 and the Nature of Ultra-Diffuse Galaxies', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-yz5tufm
