论文标题
宇宙望远镜镜头阳光弧弧，PSZ1 G311.65-18.48：强力引力透镜模型和源平面分析
The Cosmic Telescope that Lenses the Sunburst Arc, PSZ1 G311.65-18.48: Strong Gravitational Lensing model and Source Plane Analysis
论文作者
论文摘要
我们基于哈勃空间望远镜成像，档案VLT/Muse Spectroscoppoy和Chandra X射线数据，对群集PSZ1 G311.65-18.48进行了强烈的镜头分析。这个冷核簇（z = 0.443）镜头是最明亮的镜头星系，称为“阳光弧”（z = 2.3703），莱曼连续（Lyc）发射星系多成像12次。我们在该领域中识别14个额外的强镜星系，以限制强透镜模型，并报告四个的安全光谱红移。我们测量了M（<250 kpc）= 2.93+0.01/-0.02x10^14m_sun的投影集群核心质量。 Sunburst Arc源银河系的两个最不足但完整的图像被〜13倍放大，而Lyc团块被〜4-80x放大。我们提出了时间延迟预测和结论性证据，表明先前声称是瞬态的阳光弧中的差异团块不是可变的，从而加强了它是由于异常高的放大倍数而引起的。源平面的重建和对朝阳弧的分析发现其物理大小为1x2 kpc，并且在源平面中以三个不同的方向解析，在北部的0、40和75度（北部）。我们将上限的r <〜50 pc放置在未分辨总团块的源平面大小上，而lyc团块的r <〜32 pc。最后，我们报告说，在投影中，阳光弧很可能是在两个或多个星系的系统中。它们的相互作用可能会驱动恒星形成，并可能在负责泄漏LYC辐射的机制中发挥作用。
We present a strong lensing analysis of the cluster PSZ1 G311.65-18.48, based on Hubble Space Telescope imaging, archival VLT/MUSE spectroscopy, and Chandra X-ray data. This cool-core cluster (z=0.443) lenses the brightest lensed galaxy known, dubbed the "Sunburst Arc" (z=2.3703), a Lyman continuum (LyC) emitting galaxy multiply-imaged 12 times. We identify in this field 14 additional strongly-lensed galaxies to constrain a strong lens model, and report secure spectroscopic redshifts of four. We measure a projected cluster core mass of M(<250 kpc)=2.93+0.01/-0.02x10^14M_sun. The two least-magnified but complete images of the Sunburst Arc's source galaxy are magnified by ~13x, while the LyC clump is magnified by ~4-80x. We present time delay predictions and conclusive evidence that a discrepant clump in the Sunburst Arc, previously claimed to be a transient, is not variable, thus strengthening the hypothesis that it results from an exceptionally high magnification. A source plane reconstruction and analysis of the Sunburst Arc finds its physical size to be 1x2 kpc, and that it is resolved in three distinct directions in the source plane, 0, 40, and 75 degrees (east of North). We place an upper limit of r <~ 50 pc on the source plane size of unresolved clumps, and r<~ 32 pc for the LyC clump. Finally, we report that the Sunburst Arc is likely in a system of two or more galaxies separated by <~6 kpc in projection. Their interaction may drive star formation and could play a role in the mechanism responsible for the leaking LyC radiation.
