Abstract
We report EGRET upper limits on the high-energy gamma-ray emission from clusters of galaxies. EGRET observations between 1991 and 2000 were analyzed at positions of 58 individual clusters from a flux-limited sample of nearby X-ray-bright galaxy clusters. Subsequently, a co-added image from individual galaxy clusters has been analyzed using an adequately adapted diffuse gamma-ray foreground model. The resulting upper 2 σ limit for the average cluster is ∼6 × 10-9 cm-2 s-1 for E >100 MeV. Implications of the nondetection of prominent individual clusters and of the general inability to detect the X-ray-brightest galaxy clusters as a class of gamma-ray emitters are discussed. We compare our results with model predictions on the highenergy gamma-ray emission from galaxy clusters as well as with recent claims of an association between unidentified or unresolved gamma-ray sources and Abell clusters of galaxies and find these contradictory.
| Original language | English |
|---|---|
| Pages (from-to) | 155-164 |
| Number of pages | 10 |
| Journal | Astrophysical Journal |
| Volume | 588 |
| Issue number | 1 I |
| DOIs | |
| Publication status | Published - 01-05-2003 |
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
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