AI 中文总结
研究利用JWST/NIRSpec积分场单元光谱，对五个宽Hα选择且z~5的LRDs进行光谱分解和空间映射，发现其发射由至少两个不同物理成分产生，源于嵌入蓝色宿主星系的红色中央引擎，为相关模型提供了证据。
AI 中文摘要
小红点（LRDs）是詹姆斯·韦布空间望远镜发现的一类致密红色源。成像和光谱显示其光谱复杂，有“V形”连续谱、宽巴尔末发射线等。虽然这些成分的物理起源仍有争议，但近期研究提出它们源于一个致密中央引擎，可能包含一个快速增长的黑洞，且位于一个更大的宿主星系中。本文利用JWST/NIRSpec积分场单元光谱对观测到的连续谱、宽窄发射线和吸收进行光谱分解，对五个宽Hα选择的z~5的LRDs进行各成分空间映射。发现蓝色连续谱发射与窄发射线区域共空间，红色连续谱源于与宽巴尔末发射和吸收共空间的致密核。[OIII]等效宽度的空间映射显示中央核有明显下降。研究进一步证明LRD发射由至少两个不同物理成分产生，这些成分源于嵌入蓝色宿主星系中的红色中央引擎。
英文摘要
Little Red Dots (LRDs) are a population of compact red sources discovered by the James Webb Space Telescope (JWST). Imaging and spectroscopy have shown that LRDs exhibit a complex spectrum with a ``V-shaped" continuum, broad Balmer emission lines, and in some cases Balmer absorption. While the physical origin of these components remains debated, recent studies propose that they arise from a compact central engine likely hosting a rapidly growing black hole embedded within a more extended host galaxy. We test this central engine + host galaxy model using JWST/NIRSpec integral field unit (IFU) spectroscopy to spectrally decompose the observed continuum, narrow and broad emission lines, and absorption. We spatially map each component for five broad Ha-selected LRDs at z~5 observed with both the prism and high-resolution G395H grating. We find that the blue continuum emission is co-spatial with the narrow emission line region, while the red continuum arises from a compact core co-spatial with the broad Balmer emission and absorption. Spatial maps of the [OIII] equivalent width reveal a pronounced decrease in the central core. Our work provides further evidence that the LRD emission is produced by at least two distinct physical components arising from a red central engine embedded within a blue host galaxy.
Comments16 pages, 11 figures, submitted
