Constraints on dark matter annihilation from the FAST observation of the Coma Berenices dwarf galaxy

被引：6
作者：
Guo, Wen-Qing [1 ,2 ]
Li, Yichao [3 ]
Huang, Xiaoyuan [1 ,2 ]
Ma, Yin-Zhe [4 ,5 ,6 ,10 ]
Beck, Geoff [7 ,8 ]
Chandola, Yogesh [6 ]
Huang, Feng [9 ]
机构：
[1] Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210023, Peoples R China
[2] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
[3] Northeastern Univ, Coll Sci, Dept Phys, Shenyang 110819, Peoples R China
[4] Univ KwaZulu Natal, Sch Chem & Phys, Westville Campus, ZA-4000 Durban, South Africa
[5] Univ KwaZulu Natal, NAOC UKZN Computat Astrophys Ctr NUCAC, ZA-4000 Durban, South Africa
[6] Chinese Acad Sci, Key Lab Radio Astron, Purple Mt Observ, Nanjing 210023, Peoples R China
[7] Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa
[8] Univ Witwatersrand, Ctr Astrophys, ZA-2050 Johannesburg, South Africa
[9] Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
[10] Stellenbosch Univ, Dept Phys, ZA-7602 Matieland, South Africa
来源：
PHYSICAL REVIEW D | 2023年 / 107卷 / 10期
基金：
中国国家自然科学基金; 新加坡国家研究基金会;
关键词：
MILKY-WAY SATELLITES; SPHEROIDAL GALAXIES; EMISSION; SIGNAL; DECAY;
D O I：
10.1103/PhysRevD.107.103011
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Galactic center 7-ray excess, detected by the Fermi-LAT, is a very attractive tentative signal from dark matter annihilation. Searching for associated synchrotron emissions can test the dark matter interpretation for this excess. We geared the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) toward Coma Berenices (a dwarf spheroidal galaxy) for two hours of observation, and found no significant continuum radio emission, which could put constraints on the dark matter annihilation cross section, from our target. We set very stringent annihilation cross section constraints, with roughly an order of magnitude improvement over a large range of masses compared with previous radio searches. The dark matter scenario for the Galactic center 7-ray excess is in tension with the FAST observation for reasonable choices of astrophysical factors. But considering the large uncertainty on astrophysical parameters, such as the magnetic field, the diffusion coefficient, and the diffusion radius, and on dark matter halo parameters, the dark matter interpretation for the excess could still survive. Further radio observations by the FAST and other radio telescopes may reveal more about the dark matter properties.
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页数：10
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