对《银河系中心过剩的暗物质形态：银河系模拟中的费米-LAT》一文的评论
Comment on "Fermi-LAT Galactic Center Excess Morphology of Dark Matter in Simulations of the Milky Way Galaxy"
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中文总结 AI 辅助
评论指出Muru等人因误用质量投影平方而非湮灭积分，导致暗物质与老年恒星形态不可区分的结论不成立。
中文摘要 AI 辅助
Muru等人[Phys. Rev. Lett. 135, 161005 (2025)]基于HESTIA约束模拟得出结论：由暗物质湮灭和老年恒星群体所预测的银河系中心过剩的γ射线形态本质上不可区分。然而，他们的“二次暗物质”图展示的是沿视线投影质量的平方，即$\bigl[\int\rho\\,s^{2}\\,ds\bigr]^{2}$，而非湮灭积分$\int\rho^{2}\\,ds$。对非负图进行平方运算会在相应强度水平上保持其等照度线形状，这一点已由所报告的轮廓轴比所证实。对相同模拟进行修正计算后，并不支持他们的结论。
英文摘要
Muru et al. [Phys. Rev. Lett. 135, 161005 (2025)] conclude from the HESTIA constrained simulations that the $γ$-ray morphologies of the Galactic Center Excess predicted by dark matter annihilation and by an old stellar population are essentially indistinguishable. Their "quadratic dark matter" maps, however, show the square of the mass projected along the line of sight, $\bigl[\intρ\,s^{2}\,ds\bigr]^{2}$, rather than the annihilation integral $\intρ^{2}\,ds$. Squaring a nonnegative map preserves its isophote shapes at corresponding intensity levels, as confirmed by the reported contour axis ratios. The corrected calculation on the same simulations does not support their conclusion.
发表机构
- University of California – Irvine（加州大学欧文分校）
- University of Hawai‘i（夏威夷大学）
- San Francisco State University（旧金山州立大学）
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