Some recent studies have examined the gamma-ray flux profile of our Galaxy to determine the signal of dark matter annihilation. However, the results are controversial and no confirmation is obtained. In this article, we study the radio flux density profile of the M31 galaxy and show that it could manifest a possible signal of dark matter annihilation. By comparing the likelihoods between the archival observed radio flux density profile data and the predicted radio flux density profile contributed by dark matter and stellar emission, we can constrain the relevant dark matter parameters. Specifically, for the thermal annihilation cross section via the bb̄ channel, the best-fit value of dark matter mass is ∼ 30 GeV, which is consistent with the results of many recent studies. We expect that this method would become another useful way to constrain dark matter, which is complementary to the traditional radio analyses and the other indirect detections.

中文翻译：

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分析 M31 星系的射电通量密度剖面：一种可能的暗物质解释

最近的一些研究检查了我们银河系的伽马射线通量分布，以确定暗物质湮灭的信号。然而，结果是有争议的，没有得到证实。在这篇文章中，我们研究了 M31 星系的射电通量密度剖面，并表明它可能表现出暗物质湮灭的可能信号。通过比较档案观测到的无线电通量密度剖面数据与暗物质和恒星发射贡献的预测无线电通量密度剖面之间的可能性，我们可以约束相关的暗物质参数。具体而言，对于通过 bb̄ 通道的热湮灭截面，暗物质质量的最佳拟合值为 ~ 30 GeV，这与最近许多研究的结果一致。