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arXiv 2402.15840astro-ph.GAhep-ph
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强引力透镜天体 JWST-ER1 的冷暗物质与自相互作用暗物质解释

CDM and SIDM Interpretations of the Strong Gravitational Lensing Object JWST-ER1

Demao Kong, Daneng Yang, Hai-Bo Yu

AI总结:

本文针对 JWST-ER1 强透镜天体暗物质密度异常,分别用气体驱动绝热收缩的冷暗物质晕和自相互作用暗物质模型进行解释,发现截面约 0.1 cm²/g 的自相互作用暗物质能同时兼容高红移与低红移早型星系的强透镜观测。

摘要:

van Dokkum 等人(arXiv:2309.07969)利用詹姆斯·韦布空间望远镜的数据报告了红移 $z\approx2$ 处强透镜天体 JWST-ER1 的发现。爱因斯坦环内的透镜质量比由 Chabrier 初始质量函数预期的恒星质量高 $5.9$ 倍,表明存在较高的暗物质密度。在这项工作中,我们证明,受气体驱动的绝热收缩影响的冷暗物质晕可以解释观测到的透镜质量。我们在自相互作用暗物质情景下解释 JWST-ER1 的测量结果,并表明每粒子质量截面 $\sigma/m\approx0.1~{\rm cm^2/g}$ 通常更受青睐。有趣的是,$\sigma/m\approx0.1~{\rm cm^2/g}$ 也可以与红移 $z\approx0.2$ 处早型星系的强透镜观测结果一致,而在这些星系中总体上未观测到绝热收缩。

英文摘要:

van Dokkum et al. (arXiv:2309.07969) reported the discovery of JWST-ER1, a strong lensing object at redshift $z\approx2$, using data from the James Webb Space Telescope. The lens mass within the Einstein ring is $5.9$ times higher than the expected stellar mass from a Chabrier initial mass function, indicating a high dark matter density. In this work, we show that a cold dark matter halo, influenced by gas-driven adiabatic contraction, can account for the observed lens mass. We interpret the measurement of JWST-ER1 in the self-interacting dark matter scenario and show that the cross section per particle mass $σ/m\approx0.1~{\rm cm^2/g}$ is generally favored. Intriguingly, $σ/m\approx0.1~{\rm cm^2/g}$ can also be consistent with the strong lensing observations of early-type galaxies at redshift $z\approx0.2$, where adiabatic contraction is not observed overall.

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。

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