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M31中年轻星团多波段二阶图像结构的年龄与质量特征

Age and Mass Signatures in the Multiband Second-order Image Structure of Young Star Clusters in M31

Yuan Liang, Chao-Wei Tsai, Jingwen Wu

arXiv 2609.23741首次发表:更新:

发表机构

School of Astronomy and Space Science, University of Chinese Academy of Sciences; National Astronomical Observatories, Chinese Academy of Sciences; Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University(中国科学院大学天文与空间科学学院; 中国科学院国家天文台; 北京师范大学天文与空间前沿研究院)

机构由 AI 辅助整理,请以论文原文为准。

AI 中文总结

本研究通过Hessian矩阵分析M31中1249个年轻星团的多波段图像,发现年龄与峰核参数$C_S$呈反相关(F336W中$\rho=-0.61$),质量与$Q$呈反相关($\rho=-0.44$),表明年龄和质量在星团二阶图像结构中留下系统性特征。

AI 中文摘要

星团的年龄和质量可能在半分辨测光图像的二阶空间结构中留下系统性特征。为验证这一假设,我们使用Hessian矩阵分析图像,并识别出基本的光度结构,称为峰核。将此分析应用于1249个M31星团的六波段PHAT/AP图像,这些星团的基于颜色-星等图的年龄为10--300 Myr,质量为$10^{2.2}$--$10^{4.5}\\,M_{\odot}$,我们检验了年龄和质量与峰核结构参数$C_S$和$Q$的相关性。较年轻的星团在紫外波段显示出较大的$C_S$值,其中在F336W波段年龄与$C_S$的反相关最强($\rho=-0.61$),而质量较大的星团显示出较小的$Q$值,最明显的是在F336W波段($\rho=-0.44$)。这些相关性表明,紫外亮峰核的对比度随年龄增加而降低,而质量的增加则改变了不同波段中可探测结构的丰度和空间组织。

英文摘要

The ages and masses of star clusters may leave systematic signatures in the second-order spatial structure of semi-resolved photometric images. To test this hypothesis, we analyze the images using the Hessian matrix and identify basic luminous structures, termed peak cores. Applying this analysis to six-band PHAT/AP images of 1249 M31 clusters with CMD-based ages of 10--300 Myr and masses of $10^{2.2}$--$10^{4.5}\,M_{\odot}$, we examine the correlations of age and mass with the peak-core structural parameters, $C_S$ and $Q$. Younger clusters show larger $C_S$ values in the ultraviolet bands, with the strongest age--$C_S$ anti-correlation in F336W ($ρ=-0.61$), whereas more massive clusters show smaller $Q$ values, most clearly in F336W ($ρ=-0.44$). These correlations suggest that the contrast of UV-bright peak cores decreases with age, whereas increasing mass alters the abundance and spatial organization of detectable structures across different bands.

论文原文

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