| Name | 020334 |
| Title | OPTICALLY DARK GROUPS OF GALAXIES WITH EXTREME L_X/L_B |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0203340101 |
| DOI | https://doi.org/10.5270/esa-bqgz7sl |
| Author | European Space Agency |
| Description | We propose XMM observations of two remarkable ..dark. groups of galaxies to evaluate the consequences of their extremely low star formation efficiency and the implications for galaxy formation in general. Also known as OLEGS or ..fossil groups., they exhibit Lx, total mass, and gas mass similar to poor clusters, but optically they contain an isolated elliptical galaxy. A striking common feature is an abnormally high mass to light ratio (virgul500-1000). These results are however uncertain. Therefore, we have selected from the literature 2 particularly intriguing systems which have not been well-studied. We will compare their optical and X-ray properties with those of normal groups and interpret these results with gasdynamical models to obtain vital insights into galaxy/group formation. |
| Publication | No observations found associated with the current proposal |
| 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 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 | 2006-06-15T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 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 |