论文标题
通过M31的无线电观察到对WIMP暗物质的更新限制 - 所有歼灭频道
Updated constraints on WIMP dark matter by radio observations of M31 -- all annihilation channels
论文作者
论文摘要
目前的工作得出了利用M31的新无线电观测以及其DM分布和其他特性的新的无线电观察结果歼灭WIMP参数的强大约束。使用专门针对M31适用的Galprop代码的2D银河模型框架计算了由于DM歼灭而产生的发射特性。这使我们能够完善对该主题的先前研究的各种不准确性。除$χ×右arrowγγ，ν\barν$以外，所有可能的歼灭通道都获得了DM约束。在频率范围$ \ $ \ $（0.1--10）GHz中使用了多种无线电数据。结果，在光初级歼灭产物的情况下，排除了比$ \ $ \ $ \ $ \ $ \ $ \ $ \ $ \ $ \χ\χχ\ rightarrow轻轻轻\ τ^+τ^ - ，μ^+μ^ - ，gg，c \ edline {c}，u \ operline {u}，d \ overline {d}，s \ overline {s}，e^+e^ - ，e^+e^ - ，b \ edimelline {b} $（以及它们的任意组合）。较重的wimp，可以歼灭至$ w^+w^ - ，z^0z^0，t \ overline {t}，hh $;不能在热横截面的水平上进行探测，除非人们假设M31中的DM密度和磁场分布的乐观案例。总而言之，$ m_x \ gtrsim 40 $ gev代表热wimp的基金通道独立的质量限制，其全不确定性范围估计为$ \ $ \ $ \ $（20---90）GEV。所获得的排除率与矮人和AMS-02抗抗脂子测量值的Fermi-Lat观测值具有竞争力。我们的约束很大程度上限制了通过歼灭DM来解释M31的伽马射线外光环的机会。最后，我们质疑其他研究中要求的可能性，以通过M31上的无线电数据来稳健地用$ m_x> 100 $ GEV来限制重型热wimp。
The present work derived the robust constraints on annihilating WIMP parameters utilizing new radio observations of M31, as well as new studies of its DM distribution and other properties. The characteristics of emission due to DM annihilation were computed in the frame of 2D galactic model employing GALPROP code adapted specifically for M31. This enabled us to refine various inaccuracies of previous studies on the subject. DM constraints were obtained for all possible annihilation channels except $χχ\rightarrow γγ,ν\barν$. A wide variety of radio data was utilized in the frequency range $\approx$(0.1--10) GHz. As the result the thermal WIMP lighter than fiducially $\approx$(40--70) GeV was excluded in the case of light primary annihilation products $χχ\rightarrow τ^+τ^-,μ^+μ^-,gg,c\overline{c},u\overline{u},d\overline{d},s\overline{s},e^+e^-,b\overline{b}$ (and an arbitrary combination of them). Heavier WIMP, which can annihilate to $W^+W^-,Z^0Z^0,t\overline{t},hh$; can not be probed at the level of thermal cross section, unless one assumes the optimistic cases of DM density and magnetic field distributions in M31. In summary, $m_x \gtrsim 40$ GeV represents the fiducial channel-independent mass limit for the thermal WIMP with the full uncertainty range estimated to be $\approx$(20--90) GeV. The obtained exclusions are competitive to those from Fermi-LAT observations of dwarfs and AMS-02 measurements of antiprotons. Our constraints significantly restrict the opportunity to explain the gamma-ray outer halo of M31 by annihilating DM. And, finally, we questioned the possibility claimed in other studies to robustly constrain heavy thermal WIMP with $m_x > 100$ GeV by radio data on M31.
