对Huang等人《由逆行进动的银盘翘曲揭示的稍扁暗物质晕》一文的评论
Comment on 'a slightly oblate dark matter halo revealed by a retrograde precessing Galactic disk warp' by Huang et al
AI总结：
本文针对Huang等人将造父变星示踪的银盘翘曲相位随年龄的导数解释为翘曲进动率的结论提出质疑，指出该解释缺乏依据，测得的正导数实际源于遗漏翘曲自然扭转、造父变星半径-年龄相关性等变量带来的偏差。
摘要：
Huang等人（2024）测量了以经典造父变星为示踪的银河系翘曲相位$ϕ_{\text{w}}$随恒星年龄$τ$的导数，并将其解释为翘曲进动率$ω\ni\textrm{d}ϕ_{\text{w}}/\textrm{d}t=-\textrm{d}ϕ_{\text{w}}/\textrm{d}τ$。该解释缺乏依据：年轻恒星的运动轨迹接近其母气体的轨迹，示踪的是瞬时气体翘曲，而非其诞生时的翘曲形态，因此$ϕ_{\text{w}}$几乎不应随造父变星年龄变化。我们证明，测得的$\textrm{d}ϕ_{\text{w}}/\textrm{d}τ>0$结果，与忽略翘曲的自然扭转$\textrm{d}ϕ_{\text{w}}/\textrm{d}R$以及造父变星的$R$-$τ$相关性（源自银河系金属丰度梯度和造父变星金属丰度-年龄相关性）导致的遗漏变量偏差相符。
英文摘要：
Huang et al. (2024) measured the derivative of the phase $ϕ_{\mathrm{w}}$ of the Galactic warp traced by classical Cepheids with respect to their age $τ$ and interpreted it as the warp precession rate $ω\equiv\mathrm{d}ϕ_{\mathrm{w}}/\mathrm{d}t=-\mathrm{d}ϕ_{\mathrm{w}}/\mathrm{d}τ$. This interpretation is unfounded: young stars follow trajectories close to those of their parental gas and trace the instantaneous gas warp, not its shape at their time of birth: $ϕ_{\mathrm{w}}$ should hardly depend on Cepheid age. We show that the measured $\mathrm{d}ϕ_{\mathrm{w}}/\mathrm{d}τ>0$ is consistent with an omitted-variable bias from neglecting the natural twist $\mathrm{d}ϕ_{\mathrm{w}}/\mathrm{d}R$ of the warp and the $R$-$τ$ correlation for Cepheids (originating from the Galactic metallicity gradient and the Cepheid metallicity-age correlation).
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
