Recent studies of the Draco dwarf spheroidal galaxy(dSph) using XMM-Newtonobservations show that the X-ray source population is dominated by accretingwhite dwarfs(AWDs).(Saeedi et al, submitted A\A, 2018; A\A 2016; MNRAS, 2018).Among the dSphs, which are satellites of the Milky Way, there are only twodSphs, which have similar distances to the distance of the Draco dSph, butnoticeable higher stellar masses. Sculptor dSph (M =2.3 106 M ) and the SextansdSph (M =0.44 106 M ) with the distances of 90 kpc, have been never observed byXMM-Newton. We propose to observe these two dSphs for the first time, mainly inorder 1) to perform the multi-wavelength study of X-ray sources aimingclassification and study of AWDs. 2) to compare the population of AWDs of different dSphs.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2019-06-03T15:41:29Z/2019-11-28T10:52:07Z
Version
18.00_20191217_1110
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, Dr Sara Saeedi, 2020, 'Sculptor and Sextans dwarf spheriodal galaxies', 18.00_20191217_1110, European Space Agency, https://doi.org/10.57780/esa-4dg6183
