English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The vast majority of the celestial gamma-ray sources detected so far have notyet been identified with secure counterparts at other wavelenghts. Here wereport the preliminary evidence of a probable association between galaxyclusters and unidentified gamma-ray sources of high galactic latitude (|b|>20deg) in the Third EGRET catalog. All of the clusters which are most probablyassociated with EGRET sources show evidence of strong radio emission eitherbecause they host radio galaxies/sources in their environments or because theyhave a radio halo or relic inhabiting their intracluster medium. The clusterradio emission suggests that the relativistic particles (electrons, protons),which are diffusing in the intracluster medium, might be also responsible fortheir gamma-ray emission. Beyond the spatial associations of clusters withunidentified EGRET sources, we found a correlation between the radio flux at1.4 GHz of the cluster's brightest source and the gamma-ray flux, F(>100 MeV),of the associated EGRET source. For the most probable EGRET-clusterassociations we also found a further correlation between the X-ray luminosityof galaxy clusters and the gamma-ray luminosity of the associated gamma-raysource under the hypothesis that the EGRET sources have the same clusterredshifts. Such correlations are consistent with the theoretical expectationsand strengthen the probability of a true, physical association between galaxyclusters and gamma-ray sources.

First gamma-rays from galaxy clusters. Preliminary evidence of the association of galaxy clusters with EGRET unidentified gamma-ray sources