A dataset provided by the European Space Agency

Proposal ID 020467
Title EMISSION FROM THE MISSING BARYONS IN THE LOCAL GROUP
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https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0204670101

DOI https://doi.org/10.5270/esa-p1h43r9
Principal Investigator, PI Dr JOEL BREGMAN
Abstract The detection of X-ray absorption and emission lines at z = 0 has beeninterpreted as an extensive isothermal Local Group medium with a gaseous massexceeding the baryonic mass of all Local Group galaxies. A large gaseous masshelps 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 ofmagnitude lower. We can discriminate between the Galactic Halo and Local Groupmodels 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. Forthe Local Group model, the MS cloud will absorb the emission beyond it, casting an X-ray shadow .
Publications
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 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 2005-01-30T00:00:00Z
Keywords "emission lines", "kev lies", "magellanic stream cloud", "gaseous mass", "leading cosmological issue", "gas mass", "xray shadow", "magnitude lower", "xray absorption", "missing baryons", "model dependent", "gaseous mass helps", "extensive isothermal local", "baryonic mass", "alternative model", "ms cloud", "galactic halo", "gas lies", "diffuse xray emission", "missing baryon"
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Dr JOEL BREGMAN, 2005, 'EMISSION FROM THE MISSING BARYONS IN THE LOCAL GROUP', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-p1h43r9