| Name | 020467 |
| Title | EMISSION FROM THE MISSING BARYONS IN THE LOCAL GROUP |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0204670101 |
| DOI | https://doi.org/10.5270/esa-p1h43r9 |
| Author | Dr JOEL BREGMAN |
| Description | The detection of X-ray absorption and emission lines at z = 0 has been interpreted as an extensive isothermal Local Group medium with a gaseous mass exceeding the baryonic mass of all Local Group galaxies. A large gaseous mass helps to solve the missing baryon problem , a leading cosmological issue. However, the gas mass is highly model dependent, and in an alternative model, the gas lies in a Galactic halo of size 50 kpc and with a gas mass orders of magnitude lower. We can discriminate between the Galactic Halo and Local Group models by determining whether most of the diffuse X-ray emission (0.5-1 keV) lies in front or behind a Magellanic Stream cloud at a distance of 50 kpc. For the Local Group model, the MS cloud will absorb the emission beyond it, casting an X-ray shadow . |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2004-01-03T05:02:42Z/2004-01-03T19:27:52Z |
| 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 | 2005-01-30T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2005-01-30T00:00:00Z, 020467, 17.56_20190403_1200. https://doi.org/10.5270/esa-p1h43r9 |