Proposal ID | 015317 |
Title | XMM Temperature Measurements of Dark Groups of Galaxies |
Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0153170101 |
DOI | https://doi.org/10.5270/esa-rlrcysg |
Principal Investigator, PI | Dr Aaron Lewis |
Abstract | We propose observations of two dark groups of galaxies to determine ifthey represent a distinct class of objects. Also known as OLEGS or fossilgroups, they exhibit Lx, total mass, and gas mass similar to poor clusters,but optically they contain an isolated elliptical with no significantcompanions. A striking common feature is an abnormally high total mass to lightratio (~500-1000 for some objects!). These results are however uncertain, and athorough investigation of these objects is needed. We have selected from theliterature 2 particularly intriguing systems which have not been well-studied.Their comparison with normal groups of similar mass and Lx will provide vitalinformation on the process of galaxy/group formation. |
Publications |
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Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
Temporal Coverage | 2003-07-11T21:48:26Z/2003-07-12T03:58:30Z |
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. |
Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
Date Published | 2004-09-10T00:00:00Z |
Last Update | 2025-01-27 |
Keywords | "exhibit lx", "XMM", "intriguing systems", "isolated elliptical", "`` fossil", "thorough investigation", "`` dark ''", "vital information", "objects !.", "light ratio", "gas mass", "total mass", "xmm temperature measurements", "distinct class" |
Publisher And Registrant | European Space Agency |
Credit Guidelines | European Space Agency, Dr Aaron Lewis, 2004, 'XMM Temperature Measurements of Dark'' Groups of Galaxies', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-rlrcysg |