We propose XMM-Newton+HST observations of SPT-CLJ2228 5828, a high-redshift(z=0.73) galaxy cluster merger. It exhibits two widely-separated (940 kpc)centers in the galaxy distribution with counterparts identified in a weaklensing analysis. From an SPT-SZ map, the cluster gas appears to be located inbetween the two peaks of the galaxy distribution and mass map, suggesting adissociative merger. If confirmed, SPT-CLJ2228 5828 would be among the widestdissociated mergers known. The requested high-resolution X-ray observations willallow us to confirm the dissociated merger nature and to constrain the clusterX-ray temperature and luminosity to 10%. We request complementary HSTobservations to substantially improve the mass reconstruction using strong and weak gravitational lensing.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2021-05-01T07:24:36Z/2021-05-02T10:56:16Z
Version
19.16_20210326_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, Mrs Hannah Zohren, 2022, 'An XMM-Newton+HST study of an extreme comma high-redshift cluster merger', 19.16_20210326_1200, European Space Agency, https://doi.org/10.57780/esa-eyllfta
