A dataset provided by the European Space Agency

Name 020643


DOI https://doi.org/10.5270/esa-682yu62
Description Using optical spectroscopy from the Sloan Digital Sky Survey (SDSS), we have identified a unique cluster of galaxies (at z = 0.087) in which 50% of the galaxy population is spectroscopically classified as an AGN. This cluster represents the highest density of optically identified AGNs within the SDSS database. This AGN fraction is already 50 times higher than the ..typical. fraction reported in Dressler et al. (1985), but is consistent with the emerging picture 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) Find obscured AGN which were missed optically; (3) Determine if such a high AGN fraction contributes to the X-ray gas properties of the cluster through feedback.
Publication No observations found associated with the current proposal
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 Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2008-01-11T00:00:00Z, 020643, 17.56_20190403_1200. https://doi.org/10.5270/esa-682yu62