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| Dark Matter searches targeting Dwarf Spheroidal Galaxies with the Fermi Large Area Telescope | |
| Garde Lindholm;Maja | |
| 出版年 | 2015 |
| 学位授予单位 | Stockholms universitet, Fysikum, Stockholm : Department of Physics, Stockholm University |
| 英文摘要 | In this thesis I present our recent work on gamma-ray searches for dark matter with the Fermi Large Area Telescope (Fermi-LAT). We have targeted dwarf spheroidal galaxies since they are very dark matter dominated systems, and we have developed a novel joint likelihood method to combine the observations of a set of targets. In the first iteration of the joint likelihood analysis, 10 dwarf spheroidal galaxies are targeted and 2 years of Fermi-LAT data is analyzed. The resulting upper limits on the dark matter annihilation cross-section range from about 10−26 cm3 s−1 for dark matter masses of 5 GeV to about 5 × 10−23 cm3 s−1 for dark matter masses of 1 TeV, depending on the annihilation channel. For the first time, dark matter models with a cross section above the canonical thermal relic cross section (∼ 3 × 10−26 cm3 s−1) are strongly disfavored by a gamma-ray experiment. In the second iteration we include 15 dwarf spheroidal galaxies in the combined analysis, employ 4 years of data and an improved calculation of the dark matter density. The obtained upper limits range from about 10−26 cm3 s−1 for dark matter masses of 2 GeV to about 10−21 cm3 s−1 for dark matter masses of 10 TeV, depending on the annihilation channel. I briefly describe some of the evidence for dark matter, the Fermi-LAT instrument and public data releases, dwarf spheroidal galaxies, likelihood analysis, and results from analyses of Fermi-LAT data. I also document some of the tests made to verify the method and to compare different analysis setups. |
| 英文关键词 | Dark matter Fermi-LAT Dwarf spheroidal galaxies |
| 语种 | 英语 |
| URL | http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-118905 |
| 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/2XILL650/249611 |
| 推荐引用方式 GB/T 7714 | Garde Lindholm;Maja. Dark Matter searches targeting Dwarf Spheroidal Galaxies with the Fermi Large Area Telescope[D]. Stockholms universitet, Fysikum, Stockholm : Department of Physics, Stockholm University,2015. |
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