基于“悟空”号卫星的伽马射线线谱搜寻

论文

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速递

Search for gamma-ray spectral lines with the DArk Matter Particle Explorer

DAMPE Collaboration, Yun-Feng Liang

Science Bulletin, 2022, 67(7): 679–684

doi: 10.1016/j.scib.2021.12.015

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简介

宇宙中的伽马射线是空间间接探测暗物质的重要研究对象之一, 而GeV-TeV能区的伽马射线线谱在目前已知的所有天体物理机制中均不可能产生, 如果一旦发现, 这将是暗物质或新物理存在的确定性证据. “悟空”号对伽马射线的接受度尽管仅为费米卫星的约1/10, 但得益于优异的能量分辨本领, 其在线谱探测方面具有独特的优势. 为了提高线谱观测灵敏度, “悟空”号开发了两种针对性的数据集, 并根据多种暗物质空间分布构建了信噪比优化的选择天区. 基于前5年的观测数据, “悟空”号尽管未找到显著的伽马线谱信号, 但其观测可以用来对暗物质属性进行限制: 对于暗物质湮灭情形, 该限制与费米卫星相当; 对于暗物质衰变情形, 在100 GeV以下能区的限制则比费米卫星强约1倍. 该研究展示了高能量分辨探测器在暗物质搜寻方面的发现潜力.

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图文速览

Fig. 1 The average SED of the LineSearch and BgoOnly photons from the region with Galactic plane removed.

FIG. 2 TS values of line candidates at various energies in the signal optimized ROIs and the Galactic plane region ( and ). The local significance can be calculated with . The highest line energy for R16 ROI is 211 GeV which is limited by the minimum photon counts we required in a window.

FIG. 3 The 95% C.L. constraints for different DM density profiles. (a-c) The  upper limits of annihilating DM assuming the (a) Einasto, (b) NFW and (c) Isothermal profile respectively. (d) The  lower limit of decaying DM assuming the NFW profile. Yellow (green) bands show the 68% (95%) expected containment obtained from 1000 simulations of background emission with systematic uncertainties involved. The red solid and purple dotted lines are the results with and without the systematic uncertainties respectively. The blue dot-dashed lines show the 5.8-year Fermi-LAT constraints.

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本文作者列表

Francesca Alemanno, 安琪, Philipp Azzarello, Felicia Carla Tiziana Barbato, Paolo Bernardini, 毕效军, 蔡明生, Elisabetta Casilli, Enrico Catanzani, 常进, 陈灯意, 陈俊岭, 陈占方, 崔明阳, 崔天舒, 崔宇鑫, 戴皓珽, Antonio De Benedittis, Ivan De Mitri, Francesco de Palma, Maksym Deliyergiyev, Margherita Di Santo, 丁琦, 董铁矿, 董振兴, Giacinto Donvito, David Droz, 段敬来, 段凯凯, Domenico D'Urso, 樊瑞睿, 范一中, 方芳, 方堃, 封常青, 冯磊, Piergiorgio Fusco, 高旻, Fabio Gargano, 龚轲, 宫一忠, 郭东亚, 郭建华, 韩霜雪, 胡一鸣, 黄光顺, 黄晓渊, 黄永益, Maria Ionica, 蒋维, 孔洁, Andrii Kotenko, Dimitrios Kyratzis, 雷仕俊, 李尚, 李文昊, 李伟良, 李翔, 李宪强, 梁耀明, 刘成明, 刘浩, 刘杰, 刘树彬, 刘杨, Francesco Loparco, 罗川宁, 马苗, 马鹏雄, 马涛, 马晓勇, Giovanni Marsella, Mario Nicola Mazziotta, 莫丹, Maria Muñoz Salinas, 牛晓阳, 潘旭, Andrea Parenti, 彭文溪, 彭晓艳, Chiara Perrina, 乔锐, 饶家宁, Arshia Ruina, 上官芝, 沈卫华, 沈兆强, 沈仲弢, Leandro Silveri, 宋景星, Mikhail Stolpovskiy, 苏弘, 苏萌, 孙浩然, 孙志宇, Antonio Surdo, 滕学剑, Andrii Tykhonov, 汪锦州, 王连国, 汪慎, 汪舒薪, 汪晓莲, 王颖, 王砚方, 王远瞩, 韦大明, 韦家驹, 魏逸丰, 吴帝, 伍健, 武利波, 伍沙沙, Xin Wu, 夏子晴, 徐恩珩, 徐海涛, 徐志会, 徐遵磊, 许咨宗, 薛国凤, 杨海波, 杨鹏, 杨雅清, 姚会军, 余玉洪, 袁官文, 袁强, 岳川, 藏京京, 张胜霞, 张文璋, 张岩, 张毅, 张永杰, 张亚鹏, 张永强, 张云龙, 张哲, 张志永, 赵聪, 赵红赟, 赵勋峰, 周昌义, 朱岩 (DAMPE合作组)； 梁云峰

The DAMPE Experiment

The DAMPE is the first Chinese astronomical satellite, which consists of four sub-detectors, including the plastic scintillator detector, the silicon tracker, the BGO calorimeter and the neutron detector. As a general-purpose high-energy cosmic ray and gamma-ray detector, DAMPE is distinguished by the unprecedented high energy resolution on measuring the cosmic ray electrons and gamma-rays. The main scientific objectives addressed by DAMPE include probing the dark matter via the detection of high-energy electrons/positrons and gamma-rays, understanding the origin, acceleration and propagation of cosmic rays in the Milky Way, and studying the gamma-ray astronomy. The DAMPE mission is funded by the strategic priority science and technology projects in space science of the Chinese Academy of Sciences. The DAMPE collaboration consists of more than 140 members from 3 countries, including physicists, astrophysicists and engineers.