A dataset provided by the European Space Agency

Name 030254
Title Dark Matter in Elliptical Galaxies


DOI https://doi.org/10.5270/esa-x4io6x2
Author Dr Ewan O.Sullivan
Description While the brightest group and cluster dominant elliptical galaxies are believed to have large dark matter halos, recent dynamical measurements suggest that some moderate luminosity ellipticals contain little or no dark matter. However, an X-ray mass measurement for one of these galaxies produces a conflicting result. We have undertaken the first systematic survey of mass profiles in ordinary ellipticals with X-ray halos using archival data, but almost all the galaxies with X-ray data available lie in high density environments. In order to rectify this bias, we propose to observe four elliptical galaxies in low density environments with the goal of understanding their halo properties.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2005-05-02T09:45:32Z/2005-05-02T19:14:08Z
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 2006-08-03T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2006-08-03T00:00:00Z, 030254, 17.56_20190403_1200. https://doi.org/10.5270/esa-x4io6x2