A SEARCH FOR A DARK MATTER ANNIHILATION SIGNAL TOWARD THE CANIS MAJOR OVERDENSITY WITH H.E.S.S.
A SEARCH FOR A DARK MATTER ANNIHILATION SIGNAL TOWARD THE CANIS MAJOR OVERDENSITY WITH H.E.S.S.
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用 H.E.S.S 寻找指向犬大犬密度过高的暗物质湮灭信号。
DOI：
10.1088/0004-637x/691/1/175
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Aharonian F
中科院分区：
文献类型：
--
作者：
Aharonian F
提出了一种寻找暗物质湮灭信号向大犬座过密度方向的γ射线的方法。CMa的性质仍然是有争议的，一种情况是它是一个矮星系，使它成为DM湮灭搜索的有趣候选者。HESS成像大气切伦科夫望远镜阵列总共收集了9.6小时的高质量数据，假设中性伴子质量在500 GeV-10 TeV范围内，湮灭截面较大，在95%置信水平（CL）下，得到CMa矮星系质量的上限为10 9 M级.采用Navarro-Frenk-白色模型，并利用分级结构形成的数值模拟，计算了特定弱相互作用双粒子情形下速度加权湮没截面< σv>的约束条件。假设晕的总质量为3× 10 8 M，则在500 GeV-10 TeV DM粒子质量区间内，CL的95%排除极限为5× 10− 24 cm 3 s− 1。
A search for a dark matter (DM) annihilation signal into γ-rays toward the direction of the Canis Major (CMa) overdensity is presented. The nature of CMa is still controversial and one scenario represents it as a dwarf galaxy, making it an interesting candidate for DM annihilation searches. A total of 9.6 hr of high-quality data were collected with the HESS array of Imaging Atmospheric Cherenkov Telescopes, and no evidence for a very high energy γ-ray signal is found. Upper limits on the CMa dwarf galaxy mass of the order of 10 9 M☉ are derived at the 95% confidence level (CL) assuming neutralino masses in the range 500 GeV–10 TeV and relatively large annihilation cross sections. Constraints on the velocity-weighted annihilation cross section< σv> are calculated for specific weakly interacting massive-particle scenarios, using a Navarro–Frenk–White model for the DM halo profile and taking advantage of numerical simulations of hierarchical structure formation. Assuming a total halo mass of 3× 10 8 M☉, 95% CL exclusion limits of the order of 5× 10− 24 cm 3 s− 1 are reached in the 500 GeV–10 TeV DM particle mass interval.
大犬座超密度恒星种群建模：老种群和年轻种群之间的关系
DOI：
10.1086/517967
发表时间：
2007
期刊：
The Astrophysical Journal
影响因子：
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作者：
de Jong;J. T. A;Butler;Dolphin;Martínez-Delgado
通讯作者：
Martínez-Delgado
TeV伽马射线天文学源搜索的新模板背景估计
DOI：
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发表时间：
2003
期刊：
影响因子：
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作者：
G. Rowell
通讯作者：
G. Rowell