Impact of astrophysical processes on the gamma-ray background from dark matter annihilations
文献类型：期刊论文
| 作者 | Ahn, Eun-Joo; Bertone, Gianfranco; Merritt, David; Zhang, Pengjie |
| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2007-07-01 |
| 卷号 | 76期号:2页码:1 |
| 英文摘要 | We study the impact of astrophysical processes on the gamma-ray background produced by the annihilation of dark matter particles in cosmological halos, with particular attention to the consequences of the formation of supermassive black holes. In scenarios where these objects form adiabatically from the accretion of matter on small seeds, dark matter is first compressed into very dense "spikes," then its density progressively decreases due to annihilations and scattering off of stellar cusps. With respect to previous analyses, based on nonevolving halos, the predicted annihilation signal is higher and significantly distorted at low energies, reflecting the large contribution to the total flux from unevolved spikes at high redshifts. The peculiar spectral feature arising from the specific redshift distribution of the signal, would discriminate the proposed scenario from more conventional astrophysical explanations. We discuss how this affects the prospects for detection and demonstrate that the gamma-ray background from dark matter (DM) annihilations might be detectable even in the absence of a signal from the Galactic center. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 研究领域[WOS] | Astronomy & Astrophysics ; Physics |
| 关键词[WOS] | SUPERMASSIVE BLACK-HOLES ; GALACTIC-CENTER ; NEUTRALINO ANNIHILATION ; CLUSTERS ; GALAXIES ; HALOES ; EVOLUTION ; DENSITY ; CONSTRAINTS ; LUMINOSITY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000248545200026 |
| 源URL | [http://119.78.226.72/handle/331011/19509]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA 2.Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA 3.NASA, Fermilab Theoret Astrophys Grp, Batavia, IL USA 4.Univ Delaware, Dept Phys & Astron, Bartol Res Inst, Delaware, OH USA 5.Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy 6.Rochester Inst Technol, Dept Phys, Rochester, NY 14623 USA 7.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ahn, Eun-Joo,Bertone, Gianfranco,Merritt, David,et al. Impact of astrophysical processes on the gamma-ray background from dark matter annihilations[J]. PHYSICAL REVIEW D,2007,76(2):1. |
| APA | Ahn, Eun-Joo,Bertone, Gianfranco,Merritt, David,&Zhang, Pengjie.(2007).Impact of astrophysical processes on the gamma-ray background from dark matter annihilations.PHYSICAL REVIEW D,76(2),1. |
| MLA | Ahn, Eun-Joo,et al."Impact of astrophysical processes on the gamma-ray background from dark matter annihilations".PHYSICAL REVIEW D 76.2(2007):1. |
入库方式： OAI收割
来源：上海天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。