van Dokkum et al. reported the discovery of JWST-ER1, a strong lensing object at redshift z ≈ 2, 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 ≈ 0.1 cm² g⁻¹ is generally favored. Intriguingly, σ/m ≈ 0.1 cm² g⁻¹ can also be consistent with the strong lensing observations of early-type galaxies at redshift z ≈ 0.2, where adiabatic contraction is not observed overall.

中文翻译：

---

强引力透镜天体 JWST-ER1 的冷暗物质和自相互作用暗物质解释

范·多库姆等人。报道了 JWST-ER1 的发现，这是一个红移强透镜天体z≈ 2，使用詹姆斯·韦伯太空望远镜的数据。爱因斯坦环内的透镜质量比夏布里埃初始质量函数预期的恒星质量高 5.9 倍，表明暗物质密度很高。在这项工作中，我们证明了受气体驱动绝热收缩影响的冷暗物质晕可以解释观察到的透镜质量。我们解释了 JWST-ER1 在自相互作用暗物质场景中的测量结果，并表明每个粒子质量的横截面σ/米通常倾向于≈ 0.1 cm ² g ^-1 。有趣的是，σ/米≈ 0.1 cm ² g ⁻¹也可以与早期型星系红移处的强透镜观测相一致z≈ 0.2，总体上没有观察到绝热收缩。