A dataset provided by the European Space Agency

Proposal ID 020643
Title X-RAY ANALYSIS OF AN AGN DOMINATED GALAXY CLUSTER
Download Data Associated to the proposal

https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0206430101

DOI https://doi.org/10.5270/esa-682yu62
Principal Investigator, PI Dr CHRISTOPHER MILLER
Abstract 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 typicalfraction 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.
Publications
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2004-12-13T06:49:33Z/2004-12-13T14:09:53Z
Version 21.51_20241115_1113
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.
Creator Contact https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published 2008-01-11T00:00:00Z
Last Update 2026-07-09
Keywords "spectroscopically classified", "xray gas properties", "optical spectroscopy", "XMM", "sdss database", "emerging picture", "massive galaxy", "SDSS", "galaxy population", "fraction reported", "missed optically", "obscured agn", "`` typical", "agn fraction contributes", "cluster represents", "x ray analysis", "sdss optical data", "xmm time", "agn fraction"
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Dr CHRISTOPHER MILLER, 2008, 'X-RAY ANALYSIS OF AN AGN DOMINATED GALAXY CLUSTER', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-682yu62
Rights Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.