Name | 002734 |
Title | X-Ray Isophote Shapes and the Dark Matter Halo of NGC 3923 |
URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0027340101 |
DOI | https://doi.org/10.5270/esa-uvk3670 |
Author | Prof David Buote |
Description | The X-ray isophote shapes of elliptical galaxies probe both the shape and radial distribution of the gravitating mass essentially independently of th temperature profile of the hot gas. We propose to observe the elliptical NGC 3923 with XMM to obtain accurate measurements of the ellipticity of the X-ray emission extending out to the faintest isophotes detected with the ROSAT PSPC (10 arcmin, virgul90 kpc) whereas ROSAT only obtained useful ellipticity constraints within 1.5 arcmin. Consequently, our XMM observation will definitively answer the questions of whether the mass is more elongated than the stars and whether the radial mass density profile is shallower than the CDM NFW profile. These results will thus provide important tests of cosmological theories of structure formation. |
Publication | No observations found associated with the current proposal |
Instrument | EMOS1, EMOS2, EPN, RGS1, RGS2 |
Temporal Coverage | 2002-01-03T19:56:50Z/2002-01-04T08:35:43Z |
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 | 2003-05-02T00:00:00Z |
Publisher And Registrant | European Space Agency |
Credit Guidelines | European Space Agency, Prof David Buote, 2003, 002734, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-uvk3670 |