标题： J-PLUS观测的近邻星系中空间分辨的恒星群体和发射线性质——I. M101星系群的方法与初步结果 显示英文标题

标题： Spatially resolved stellar populations and emission lines properties in nearby galaxies with J-PLUS -- I. Method and first results for the M101 group

摘要： 空间分辨的恒星群体和星云发射图像是理解星系物理特性和演化阶段的关键工具。我们旨在利用Javalambre天文局部宇宙巡天（J-PLUS）数据表征M101群中星系的空间分辨恒星群体和发射线特性。数据立方体首先经过预处理步骤，包括掩膜、噪声抑制、点扩散函数同质化和空间分箱。然后使用光谱合成代码\alstar 对改进后的数据进行分析，该代码之前已被证明能与J-PLUS和S-PLUS的独特12带滤镜系统一起产生出色的结果。我们生成了恒星质量面密度（$\Sigma_\star$）、平均恒星年龄和金属丰度、恒星形成率面密度（$\Sigma_{\rm SFR}$）、尘埃消光以及主要光学线的流量和等效宽度的发射线特性图。探索了这些特性之间的关系。所有星系都显示出一个定义明确的年龄-$\Sigma_\star$关系，除了矮星系外。类似地，所有星系都遵循局部$\Sigma_\star$-$\Sigma_{\rm SFR}$星形成主序关系，对于质量较小的系统，比恒星形成率会增加。M101中存在明显的恒星$\Sigma_\star$-金属丰度关系，而其他星系则具有较平缓或未定义的关系。 星云金属丰度与所有星系的$\Sigma_\star$相关。 本研究展示了J-PLUS能够执行类似积分场光谱分析的能力，提供了在大视场内对恒星群体和发射线进行稳健的空间分辨测量。 M101星团的分析展示了将此类研究扩展到其他星团和群的可能性，有助于理解不同环境中星系的演化。 显示英文摘要

摘要： Spatially resolved maps of stellar populations and nebular emission are key tools for understanding the physical properties and evolutionary stages of galaxies. We aim to characterize the spatially resolved stellar population and emission line properties of galaxies in the M101 group using Javalambre Photometric Local Universe Survey (J-PLUS) data. The datacubes first go through pre-processing steps, which include masking, noise suppression, PSF homogenization, and spatial binning. The improved data are then analyzed with the spectral synthesis code \alstar, which has been previously shown to produce excellent results with the unique 12 bands filter system of J-PLUS and S-PLUS. We produce maps of stellar mass surface density ($\Sigma_\star$), mean stellar age and metallicity, star formation rate surface density ($\Sigma_{\rm SFR}$), dust attenuation, and emission line properties such as fluxes and equivalent widths of the main optical lines. Relations among these properties are explored. All galaxies exhibit a well-defined age-$\Sigma_\star$ relation, except for the dwarfs. Similarly, all of the galaxies follow local $\Sigma_\star$-$\Sigma_{\rm SFR}$ star-forming MS relations, with specific star formation rates that grow for less massive systems. A stellar $\Sigma_\star$-metallicity relation is clearly present in M101, while other galaxies have either flatter or undefined relations. Nebular metallicities correlate with $\Sigma_\star$ for all galaxies. This study demonstrates the ability of J-PLUS to perform IFS-like analysis of galaxies, offering robust spatially resolved measurements of stellar populations and emission lines over large fields of view. The M101 group analysis showcases the potential for expanding such studies to other groups and clusters, contributing to the understanding of galaxy evolution across different environments.