A dataset provided by the European Space Agency

Name 055388
Title Detecting Emission from the Missing Baryons Through X-Ray Shadowing
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0553880201
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0553880301

DOI 10.5270/esa-zkjtsus
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. These baryons are most likely diffuse gas at 1E5 - 1E7 K in regions of modest overdensity, and the superposition of many such regions produces X-ray emission that accounts for about 5-20% of the X-ray background in the 0.2-1 keV range. To detect this emission, we propose to use the shadowing properties of the extended gas in the edge-on galaxy NGC 4244. This gas will absorb some of the background emission, leading to a local minimum in the soft X-ray background (a shadow).
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Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2008-11-16T19:34:56Z/2008-11-19T10:10:13Z
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 2009-12-20T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2009-12-20T00:00:00Z, 055388, 17.56_20190403_1200. https://doi.org/10.5270/esa-zkjtsus