A dataset provided by the European Space Agency

Name 014519
Title Shadowing the Diffuse Extragalactic X-Ray Background
URL

https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0145190101
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0145190201

DOI https://doi.org/10.5270/esa-15fmbmf
Author Prof Joel Bregman
Description The majority of the baryons in the present-day universe are missing in that they are not in galaxies or as cool intergalactic gas (<1E5K). These baryons are most likely diffuse gas at 1E6 - 1E7 K in regions of modest overdensity, and the superposition of many such regions can produce detectable X-ray emission that accounts for about 10-30% of the X-ray background in the 0.2-1 keV range. To detect this emission, we used the shadowing properties of the gas in the edge-on galaxy NGC 891, and we find a shadow at the 99% confidence level, consistent with a fraction of the XRB in a diffuse cosmic component. We propose additional observations of a better edge-on system, NGC 5907, to determine whether shadows are universal and to better measure the level of this cosmic diffuse XRB.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2003-02-20T15:33:39Z/2003-03-01T04:17:31Z
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 2004-03-16T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2004, 014519, 17.56_20190403_1200. https://doi.org/10.5270/esa-15fmbmf