| Proposal ID | 020334 |
| Title | OPTICALLY DARK GROUPS OF GALAXIES WITH EXTREME L_X/L_B |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0203340101 |
| DOI | https://doi.org/10.5270/esa-bqgz7sl |
| Principal Investigator, PI | Prof WILLIAM MATHEWS |
| Abstract | We propose XMM observations of two remarkable dark groups of galaxies toevaluate the consequences of their extremely low star formation efficiency andthe implications for galaxy formation in general. Also known as OLEGS orfossil groups, they exhibit Lx, total mass, and gas mass similar to poorclusters, but optically they contain an isolated elliptical galaxy. A strikingcommon feature is an abnormally high mass to light ratio (~500-1000). Theseresults are however uncertain. Therefore, we have selected from the literature 2particularly intriguing systems which have not been well-studied. We willcompare their optical and X-ray properties with those of normal groups andinterpret these results with gasdynamical models to obtain vital insights into galaxy/group formation. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, RGS1, RGS2 |
| Temporal Coverage | 2005-05-04T10:17:01Z/2005-05-05T01:31:27Z |
| 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 | 2006-06-15T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "exhibit lx", "gasdynamical models", "intriguing systems", "galaxy formation", "xray properties", "`` fossil", "isolated elliptical galaxy", "`` dark ''", "XMM", "light ratio", "vital insights", "total mass", "gas mass", "optically dark" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Prof WILLIAM MATHEWS, 2006, 'OPTICALLY DARK GROUPS OF GALAXIES WITH EXTREME L_X/L_B', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-bqgz7sl |