Although fossil systems are thought to be very old, only a few displayabove-average concentration parameters. Recently, using Chandra and Suzaku dataextending out to R2500 of the well-studied fossil group NGC 6482, we measuredc200 that exceeds the mean LCDM c-M relation by 6 sigma with respect to theintrinsic scatter and by 3.5 sigma with respect to the measurement error. Theextreme outlier status, if confirmed, would pose a challenge to LCDM galaxyformation, since the scatter in the c-M relation is robust and insensitive tocosmological parameters. We propose a deep XMM-Newton observation of NGC 6482 toobtain precise measurements of the gas properties out to R500, particularly thetemperature, to verify the high c200 and cement its status as the most extremely evolved fossil system known.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2018-09-22T13:23:46Z/2019-04-11T14:27:03Z
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, Dr David Buote, 2020, 'The Extremely High Concentration of the Fossil Group NGC 6482', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-3v7ov7p
