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Searching for Gamma Rays from Galaxy Clusters with the Fermi Large Area Telescope : Cosmic Rays and Dark Matter | |
Zimmer;Stephan | |
出版年 | 2013 |
学位授予单位 | Stockholms universitet, Fysikum, Stockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC), Stockholm |
英文摘要 | In this licentiate thesis, I report a search for GeV γ rays towards the location of Galaxy clusters. I mainly discuss the results of a search for cosmic-ray (CR) induced γ-ray emission but also briefly elaborate on a related study, searching for Dark Matter (DM)-induced γ-ray emission from Galaxy clusters. In addition, I provide a detailed discussion on the analysis tools that were used and discuss some additional tests that are not included in the papers this licentiate thesis is based on. In a comprehensive search almost covering the entire sky, we find no statistically significant evidence for either DM or CR induced γ rays from galaxy clusters. Thus we report upper limits on CR quantities that exclude emission scenarios in which the maximum hadronic injection efficiency is larger than 21% and associated limits on the maximum CR-to-thermal pressure ratio, |
英文关键词 | Galaxy clusters Gamma rays Cosmic rays Dark matter Fermi-lat Likelihood analysis Joint likelihood Astronomy Astrophysics and Cosmology Astronomi astrofysik och kosmologi |
语种 | 英语 |
URL | http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-96231 |
来源机构 | Stockholms universitet |
资源类型 | 学位论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/247478 |
推荐引用方式 GB/T 7714 | Zimmer;Stephan. Searching for Gamma Rays from Galaxy Clusters with the Fermi Large Area Telescope : Cosmic Rays and Dark Matter[D]. Stockholms universitet, Fysikum, Stockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC), Stockholm,2013. |
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