利用VIPERS将小红点星系群拓展至中等红移
Extending the Little Red Dot population at intermediate redshift with VIPERS
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- Universidad de Valladolid（巴利亚多利德大学）
- INAF - Osservatorio Astronomico di Brera（意大利国家天体物理研究所布雷拉天文台）
- Adam Mickiewicz University（亚当·密茨凯维奇大学）
- Nicolaus Copernicus University（哥白尼大学）
- INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna（意大利国家天体物理研究所博洛尼亚天体物理与空间科学观测站）
- National Centre for Nuclear Research（波兰国家核研究中心）
机构由 AI 辅助整理，请以论文原文为准。
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中文总结 AI 辅助
利用VIPERS巡天在0.5<z<1.75识别出14个类LRD源，发现其数密度在宇宙正午之后迅速下降，为连接本地与高红移研究提供了新约束。
中文摘要 AI 辅助
小红点（LRDs）是最近发现的一类致密、红色源，其特征是独特的V形紫外到光学连续谱和宽发射线。它们的物理结构和演化仍不确定，而它们在中等红移处的性质在很大程度上尚未被探索。我们利用VIMOS公共河外星系红移巡天（VIPERS）在0.5<z<1.75范围内识别并刻画了类LRD源，将观测研究拓展到了一个先前探索较少的宇宙时期。我们根据宽带测光测量的紫外和光学斜率选择候选体，并利用VIPERS光谱中的宽发射线对样本进行筛选。我们研究了它们的光度、光谱和形态性质，利用HSC成像约束其物理大小，测量其共动数密度及其演化，并利用VIPERS星系密度场刻画其局部环境。我们还使用CIGALE对唯一的X射线探测源的多波段辐射进行建模，包括X射线和活动星系核（AGN）辐射。我们识别出14个类LRD源，其中包括一个X射线探测天体，其HSC形态仍未分辨。我们在两个红移区间（0.5<z<1和1<z<1.75）测量了它们的数密度，并将我们的结果与文献测量相结合。我们发现数密度在宇宙正午之后迅速下降。两个环境约束充分的源位于欠密区域。X射线探测源的SED最好由一个在低倾角下观测到的辐射高效吸积盘模型来重现。我们的结果表明，类LRD源存在于z>0.5处，连接了本地和高红移研究。它们的丰度、致密形态、环境性质和多波段辐射为这一群体的演化和物理起源提供了新的约束。
英文摘要
Little red dots (LRDs) are a recently identified population of compact, red sources characterised by a distinctive V-shaped UV-to-optical continuum and broad emission lines. Their physical structure and evolution remain uncertain, while their properties at intermediate redshifts are largely unexplored. We identify and characterise LRD-like sources at 0.5<z<1.75 using the VIMOS Public Extragalactic Redshift Survey (VIPERS), extending observational studies to a previously poorly explored cosmic epoch. We select candidates from their UV and optical slopes measured from broadband photometry and refine the sample using broad emission lines in VIPERS spectroscopy. We investigate their photometric, spectroscopic, and morphological properties, constrain their physical sizes with HSC imaging, measure their comoving number density and evolution, and characterise their local environments using the VIPERS galaxy density field. We also model the multi-wavelength emission of the unique X-ray-detected source with CIGALE, including X-ray and AGN emission. We identify 14 LRD-like sources, including one X-ray-detected object, whose HSC morphology remains unresolved. We measure their number density in two redshift bins, 0.5<z<1 and 1<z<1.75, and combine our results with literature measurements. We find a rapid decline in number density after cosmic noon. The two sources with sufficiently constrained environments are located in underdense regions. The SED of the X-ray-detected source is best reproduced by a radiatively efficient accretion disk viewed at low inclination. Our results demonstrate that LRD-like sources are present at z>0.5, bridging local and high-redshift studies. Their abundance, compact morphology, environmental properties, and multi-wavelength emission provide new constraints on the evolution and physical origin of this population.
