| Proposal ID | 050111 |
| Title | Are fossil groups a challenge of the CDM paradigm? |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0501110101 |
| DOI | https://doi.org/10.5270/esa-offpf58 |
| Principal Investigator, PI | Dr Gabriel Pratt |
| Abstract | Fossil groups may have up to two orders of magnitude less substructure thanpredicted in CDM simulations. The significance of this lack of substructuredepends on the depth of the galaxy luminosity function and on the mass of thegroup. We have initiated a project to determine the substructure distributionfunction (SDF) for the members of a representative sample of 4 REFLEX fossilgroups down to $M^* + 6$ within a large fraction of the infall region. We willobtain X-ray observations of two fossil groups to complete the X-ray sample, tocomplement the optical observations and to compare with new simulations. We willcompare the SDF from optical and X-ray mass estimates with theoreticalpredictions. We will establish if fossil groups do challenge the CDM paradigm. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2007-05-29T23:28:09Z/2007-11-23T09:19:27Z |
| 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 | 2009-01-01T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "xray sample", "cdm paradigm ?.", "cdm simulations", "xray mass", "cdm paradigm", "infall region", "galaxy luminosity function", "reflex fossil" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Gabriel Pratt, 2009, 'Are fossil groups a challenge of the CDM paradigm?', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-offpf58 |