| Proposal ID | 030663 |
| Title | Probing warm-hot intergalactic medium associated with the Virgo cluster |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0306630101 |
| DOI | https://doi.org/10.5270/esa-wvfcffa |
| Principal Investigator, PI | Dr Ryuichi Fujimoto |
| Abstract | The amount of baryons detected at z=0 is only about 20% of that detected atz~3, 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. |
| Publications |
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| 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2007-01-11T00:00:00Z |
| Last Update | 2025-08-04 |
| Keywords | "absorption line", "oxygen absorption lines", "bang nucleosynthesis", "5sigma confidence", "exposure time", "universe reside", "simulations predict", "confidence level" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | 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 |