SIMBAD references

2011MNRAS.415.1961F - Mon. Not. R. Astron. Soc., 415, 1961-1966 (2011/August-1)

An estimate of the electron density in filaments of galaxies at z∼ 0.1.


Abstract (from CDS):

Most of the baryons in the Universe are thought to be contained within filaments of galaxies, but as yet, no single study has published the observed properties of a large sample of known filaments to determine typical physical characteristics such as temperature and electron density. This paper presents a comprehensive large-scale search conducted for X-ray emission from a population of 41 bona fide filaments of galaxies to determine their X-ray flux and electron density. The sample is generated from the filament catalogue of Pimbblet et al., which is in turn sourced from the two-degree Field Galaxy Redshift Survey (2dFGRS). Since the filaments are expected to be very faint and of very low density, we used stacked ROSAT All-Sky Survey data. We detect a net surface brightness from our sample of filaments of (1.6±0.1) {x} 10–14 erg/cm2/s/arcmin2 in the 0.9-1.3 keV energy band for 1-keV plasma, which implies an electron density of ne= (4.7±0.2) {x} 10–4 h1/2100/cm3. Finally, we examine if a filament's membership to a supercluster leads to an enhanced electron density as reported by Kull & Böhringer. We suggest it remains unclear if supercluster membership causes such an enhancement.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): galaxies: clusters: general - cosmology: observations - large-scale structure of Universe - X-rays: general

Simbad objects: 59

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