A dataset provided by the European Space Agency

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 (virgul500-1000 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
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
Keywords "objects !.", "`` dark ''", "XMM", "exhibit lx", "intriguing systems", "total mass", "isolated elliptical", "distinct class", "gas mass", "thorough investigation", "xmm temperature measurements", "`` fossil", "vital information", "light ratio"
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