Using optical spectroscopy from the Sloan Digital Sky Survey (SDSS), we haveidentified a unique cluster of galaxies (at z = 0.087) in which 50% of thegalaxy population is spectroscopically classified as an AGN. This clusterrepresents the highest density of optically identified AGNs within the SDSSdatabase. This AGN fraction is already 50 times higher than the ..typical.fraction reported in Dressler et al. (1985), but is consistent with the emergingpicture that all massive galaxies may possess an AGN. We will use XMM time to(1) confirm the high AGN fraction derived from the SDSS optical data; (2) Findobscured AGN which were missed optically; (3) Determine if such a high AGNfraction contributes to the X-ray gas properties of the cluster through feedback.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2004-12-13T06:49:33Z/2004-12-13T14:09:53Z
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 CHRISTOPHER MILLER, 2008, 'X-RAY ANALYSIS OF AN AGN DOMINATED GALAXY CLUSTER', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-682yu62
