A dataset provided by the European Space Agency

Name 020221


DOI https://doi.org/10.5270/esa-k9vy1k6
Description Where, and in what form, are most of the Baryons in the local universe? At high redshift we seem to know the answer, but a substantial fraction of the baryons seem to be missing at low redshift! It is very likely that this material resides in the haloes of galaxies and galaxy groups, at densities and temperatures that make it hard to detect by conventional means. This material should be detectable through the OVII and OVIII absorption of a background source. However, we argue that observation of random sight-lines is not effective, and that we must deliberately target lines of sight that pass through the centers of galaxy groups. Although very rare, we have identified two particularly favourable sight-lines that will allow us to detect this important baryon reservoir.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2005-02-02T17:42:30Z/2005-02-05T17:53:03Z
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 2006-02-23T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2006, 020221, 17.56_20190403_1200. https://doi.org/10.5270/esa-k9vy1k6