A dataset provided by the European Space Agency

Name 015317
Title XMM Temperature Measurements of ''Dark.. Groups of Galaxies


DOI https://doi.org/10.5270/esa-rlrcysg
Author Dr Aaron Lewis
Description We propose observations of two ..dark. groups of galaxies to determine if they represent a distinct class of objects. 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 with no significant companions. A striking common feature is an abnormally high total mass to light ratio (virgul500-1000 for some objects!). These results are however uncertain, and a thorough investigation of these objects is needed. We have selected from the literature 2 particularly intriguing systems which have not been well-studied. Their comparison with .normal. groups of similar mass and Lx will provide vital information on the process of galaxy-group formation.
Publication No observations found associated with the current proposal
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 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 2004-09-10T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2004-09-10T00:00:00Z, 015317, 17.56_20190403_1200. https://doi.org/10.5270/esa-rlrcysg