Abstract
The extragalactic gamma ray background (EGRB) could arise from two distinct scenarios: truly diffuse processes or from unresolved point sources. Here we examine contribution from unresolved normal galaxies, starburst galaxies and AGNs. γ-ray emission from normal galaxies is mostly due to cosmic ray interactions with interstellar matter and radiation. Though no starburst galaxy has been detected so far in γ-rays, enhanced supernovae activity is expected to lead to higher cosmic ray densities, making starburst galaxies sufficiently γ-ray luminous to be detected by GLAST, γ-rays from blazars are believed to arise from relativistic jets. The γ-ray emission is expected to decrease with increasing jet inclination angle. The γ-ray detection of Cen A and NGC 6251 suggests, other sub-classes of AGNs could also be potential contributors to the γ-ray background. Preliminary results are discussed.
| Original language | English |
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| Title of host publication | First GLAST Symposium |
| Pages | 480-481 |
| Number of pages | 2 |
| Volume | 921 |
| DOIs | |
| Publication status | Published - 2007 |
| Event | 1st Gamma-ray Large Area Space Telescope Symposium, GLAST - Stanford, CA, United States Duration: 05-02-2007 → 08-02-2007 |
Conference
| Conference | 1st Gamma-ray Large Area Space Telescope Symposium, GLAST |
|---|---|
| Country/Territory | United States |
| City | Stanford, CA |
| Period | 05-02-07 → 08-02-07 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)