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arXiv 2407.05906astro-ph.GA
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$z\sim1$ 处一次主并合中莱曼连续谱光子的泄漏

The leakage of Lyman-continuum photons from a major merger at $z\sim1$

Soumil Maulick, Kanak Saha, Manish Kataria, Edmund Christian Herenz

AI总结:

本文利用AstroSat/UVIT在哈勃超深场探测到红移1.097处大质量并合系统泄漏的超8%莱曼连续谱光子,表明大质量并合系统对宇宙电离预算有重要贡献。

摘要:

我们报告在哈勃超深场中探测到来自 $z=1.097$ 处一个大质量相互作用系统的莱曼连续谱(LyC)光子。该 LyC 探测由 AstroSat 卫星上搭载的 UVIT 望远镜的远紫外 F154W 波段完成。该系统的 JWST 和 HST 成像均显示其可能是一个并合系统。特别是,JWST 波段的高分辨率成像揭示了系统内存在一个在较蓝的 HST 波段中较暗的红外明亮天体。来自 MUSE-UDF 数据的电离气体运动学支持了这一并合假说。我们估计整个系统向星系际介质泄漏了超过 $8\%$ 的电离光子。基于 SED 得出的两个组件的恒星质量表明,这是一次质量比为 ${1.13 \pm 0.37}$ 的主并合。此次探测暗示,在主并合更为频繁的更高红移处,大质量相互作用系统可能对宇宙的电离预算有潜在贡献。

英文摘要:

We report the detection of Lyman-continuum (LyC) photons from a massive interacting system at $z=1.097$ in the Hubble Ultra Deep Field. The LyC detection is made in the far-ultraviolet F154W band of the UVIT telescope onboard AstroSat. Both JWST and HST imaging of the system reveal signs that it is a likely merger. In particular, high-resolution imaging in the JWST bands reveals an infrared luminous object within the system that is faint in the bluer HST bands. The ionized-gas kinematics from the MUSE-UDF data supports the merger hypothesis. We estimate that the entire system is leaking more than $8 \%$ of its ionizing photons to the intergalactic medium. The SED-derived stellar masses of the two components indicate that this is a major merger with a mass ratio of ${1.13 \pm 0.37}$. This detection hints at the potential contribution of massive interacting systems at higher redshifts, when major mergers were more frequent, to the ionizing budget of the universe.

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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