Darling Jeremy
Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado, 389 UCB Boulder, Colorado 80309-0389, USA.
Phys Rev Lett. 2020 Sep 18;125(12):121103. doi: 10.1103/PhysRevLett.125.121103.
We report on a search for dark matter axion conversion photons from the magnetosphere of the Galactic Center magnetar PSR J1745-2900 using spectra obtained from the Karl G. Jansky Very Large Array (the National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.). No significant spectral features are detected. Using a hybrid model for PSR J1745-2900 and canonical assumptions about the dark matter density profile, we exclude axion models with axion-photon coupling g_{aγγ}>6-34×10^{-12} GeV^{-1} with 95% confidence over the mass ranges 4.2-8.4, 18.6-26.9, 33.0-41.4, 53.7-62.1, and 126.0-159.3 μeV. If there is a dark matter cusp, the limits reduce to g_{aγγ}>6-34×10^{-14} GeV^{-1}, which overlap some axion models for the observed mass ranges >33 μeV. These limits may be improved by modeling the stimulated emission that can boost the axion-photon conversion process.
我们报告了一项利用卡尔·G·扬斯基甚大阵列获取的光谱，对来自银河系中心磁星PSR J1745 - 2900磁层的暗物质轴子转换光子进行的搜索（美国国家射电天文台是美国国家科学基金会的设施，由联合大学公司根据合作协议运营）。未检测到显著的光谱特征。使用PSR J1745 - 2900的混合模型以及关于暗物质密度分布的标准假设，我们在4.2 - 8.4、18.6 - 26.9、33.0 - 41.4、53.7 - 62.1和126.0 - 159.3 μeV的质量范围内，以95%的置信度排除了轴子 - 光子耦合(g_{aγγ}>6 - 34×10^{-12}) (GeV^{-1})的轴子模型。如果存在暗物质尖点，限制将降至(g_{aγγ}>6 - 34×10^{-14}) (GeV^{-1})，这与观测质量范围>(33) μeV的一些轴子模型重叠。通过对可增强轴子 - 光子转换过程的受激辐射进行建模，这些限制可能会得到改善。
