自相互作用暗物质延迟孤立富气星系盘中的棒形成：基于力矩分解的数值证据
Self-interacting dark matter delays bar growth in an isolated gas-rich galactic disk: torque-resolved numerical evidence
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中文总结 AI 辅助
本研究通过数值模拟发现，在富气星系盘中，自相互作用暗物质（SIDM）相比冷暗物质（CDM）延迟恒星棒形成约0.73 Gyr，并抑制棒振幅22%，且气体成分显著影响SIDM的作用方向与时机。
中文摘要 AI 辅助
我们研究了动态响应的气体盘如何改变自相互作用暗物质（SIDM）对恒星棒形成的影响。在一个总重子质量固定的孤立银河系质量星系中，富气无碰撞（CDM）模型在1.96 Gyr时形成持续存在的棒，而匹配的SIDM模型（σ/m=1 cm² g⁻¹）在2.69 Gyr时才形成。最终恒星m=2振幅在CDM中为0.437，在SIDM中为0.340，抑制了22%；对应的无气体对照组在同一时间间隔内保持较弱。一个独立采样的富气配对保持了两种差异的方向。直接分量力测量表明，SIDM恒星盘比CDM对应盘少损失2.82×10¹¹ M☉ kpc km/s的角动量。积分力矩对比主要由暗晕主导（约74%），气体贡献显著（26%），并在半径和时间上重新分布，而非晕耦合的均匀减少。守恒性、力精度、孔径、阈值和独立采样检查支持该排序作为该模型内的动力学效应。结果表明，活跃气体成分可以改变从无碰撞盘推断出的早期SIDM影响的符号和时机，为未来流体动力学SIDM研究提供了基于机制的约束。
英文摘要
We investigate how a dynamically responsive gas disk changes the influence of self-interacting dark matter (SIDM) on stellar-bar formation. In an isolated Milky-Way-mass galaxy with fixed total baryonic mass, the gas-rich collisionless (CDM) model develops a persistent bar at $1.96\,\Gyr$, whereas the matched SIDM model with $\sigmam=1\,\mathrm{cm^2\,g^{-1}}$ does so at $2.69\,\Gyr$. The final stellar $m=2$ amplitude is 0.437 in CDM and 0.340 in SIDM, a 22 per cent suppression; the corresponding gas-free controls remain weak over the same interval. An independently sampled gas-rich pair preserves the direction of both differences. Direct component-force measurements show that the SIDM stellar disk loses $2.82\times10^{11}\,\Msun\,\kpc\,\kms$ less angular momentum than its CDM counterpart. The integrated torque contrast is dominated by the dark halo (approximately 74 per cent), with a substantial gas contribution (26 per cent), and is redistributed in radius and time rather than being a uniform reduction of halo coupling. Conservation, force-accuracy, aperture, threshold, and independent-sampling checks support the ordering as a dynamical effect within this model. The result demonstrates that a live gas component can change both the sign and timing of the early SIDM impact inferred from collisionless disks, providing a mechanism-based constraint for future hydrodynamic SIDM studies.
发表机构
- Intelligent Manufacturing College, Zhejiang Guangsha Vocational and Technical University of Construction（浙江广厦建设职业技术大学智能制造学院）
- Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）
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