A dataset provided by the European Space Agency

Proposal ID 020618
Title THE TOTAL BARYON FRACTION IN GROUPS: MAPPING HOT GAS OUT TO THE VIRIAL RADIUS
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https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0206180101
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0206180201
DOI https://doi.org/10.5270/esa-jubp08a
Principal Investigator, PI Mr JESPER RASMUSSEN
Abstract Galaxy groups probably contain most of the baryons in the Universe.Unfortunately the low X-ray surface brightness of groups has prevented thedetection of the gas at large radii which should dominate their baryon content.We propose, for the first time, to trace the surface brightness of a few groupsout to close to R_200. This will allow us to measure total gas and iron masses,baryon fractions, and mass/light, gas/star, and iron-mass/light ratios, and toinvestigate the differences from rich clusters. Coupled with results fromexisting XMM data, this will provide template profiles for extrapolating theproperties of groups to large radii, test formation scenarios for groups, andtest whether clusters can be formed by the merger of galaxy groups.
Publications
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2004-04-24T13:57:33Z/2004-04-30T16:03:56Z
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 2005-06-18T00:00:00Z
Keywords "existing xmm data", "iron masses", "mapping hot gas", "XMM", "surface brightness", "light ratios", "test formation scenarios", "virial radius", "iron mass", "total baryon fraction", "baryon fractions", "template profiles", "total gas", "rich clusters", "baryon content"
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Mr JESPER RASMUSSEN, 2005, 'THE TOTAL BARYON FRACTION IN GROUPS: MAPPING HOT GAS OUT TO THE VIRIAL RADIUS', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-jubp08a