The amount of baryons detected at z=0 is only about 20% of that detected atzvirgul3, or calculated from the standard big-bang nucleosynthesis. Recentsimulations predict that most of the baryons in the present Universe residein a warm-hot intergalactic medium (WHIM) with temperatures of 10**5-7K,associated with clusters of galaxies. At AO-2, we proposed an observationof a quasar behind the Virgo to detect oxygen absorption lines due to theWHIM associated with the cluster. We marginally detected a redshifted OVIIIabsorption line. However, the exposure time was not long enough, and theconfidence level of the absorption line was 96.4%. Hence, we resubmit thisproposal to confirm the absorption line with 5sigma confidence.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2005-12-13T10:01:25Z/2005-12-18T10:20:35Z
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.
European Space Agency, Dr Ryuichi Fujimoto, 2007, 'Probing warm-hot intergalactic medium associated with the Virgo cluster', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-wvfcffa
