Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..567b&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 567 - 568
Astronomy and Astrophysics
Astrophysics
Clusters Of Galaxies: Filaments, Clusters Of Galaxies: X Rays
Scientific paper
Clusters of galaxies are often located at the intersections of long filaments of galaxies, and numerical simulations of structure formation indicate that these filaments contain not only dark matter and galaxies but also moderately hot gas. Hence the filaments might be visible in X-rays if they contain sufficiently dense gas. Data from the ROSAT All-Sky Survey were used to search for X-ray emission from such filaments connecting clusters. The authors do not find any filament emission. The 2-sigma upper limit for a 1 keV plasma is 3.9×10-16erg cm-2s-1arcmin-2 in the 0.5 to 2.0 keV energy band. This upper limit yields an upper limit on the filament electron density comparable to that found in some large scale structure models. It is concluded that the new extended cluster component, found in a region of the ROSAT All-Sky Survey by cross-correlating its background fluctuations with the Abell cluster catalogue, is not confined to filaments connecting clusters.
Briel Ulrich G.
Henry Patrick J.
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