发表机构
Institute of Astronomy and Kavli Institute for Cosmology, University of Cambridge（剑桥大学天体物理研究所与卡弗里宇宙学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用DustPedia星系目录和CIGALE SED拟合，比较90颗邻近Ia型超新星的局部与宿主星系整体环境，发现局部尘埃消光等性质显著不同，表明基于整体性质的标准化可能掩盖关键差异。
AI 中文摘要
Ia型超新星（SNe Ia）作为可标准化蜡烛的持续应用依赖于对其标准化亮度与宿主星系性质之间关系的额外修正。目前，这一修正是基于宿主星系恒星质量构建的，通常仅通过光学波段SED拟合得出，而近期分析表明这种方法可能无法完全捕捉潜在的环境性质。当考虑超新星最近区域而非整个星系时，这种关系更为显著。我使用DustPedia星系中的SNe Ia样本和\ exttt{CIGALE} SED拟合，将90颗邻近SNe Ia的局部环境与其宿主星系的整体性质进行比较。DustPedia的UV-to-FIR覆盖范围能够改进尘埃约束，并有助于打破仅限光学研究所受的年龄-尘埃简并；据我所知，这种覆盖此前从未应用于SNe Ia周围的亚星系区域。恒星质量和尘埃质量在局部较低，仅仅是因为孔径包围的星系部分较少；然而，对于颜色、比恒星形成率（sSFR）和尘埃消光，局部值与宿主星系平均值之间的差异超出了仅由测量不确定性所能解释的范围，其中消光的差异最为显著（$p=6.3\ imes10^{-5}$）。只有质量加权年龄在局部和整体上是一致的。因此，星系整体性质无法捕捉超新星位置的真实条件。超新星兄弟（共享同一宿主星系）仅强调了这一效应。采样相同星系结构的兄弟，例如旋臂中的两颗超新星，具有一致的环境，而其他则存在分歧。因此，基于整体性质进行标准化可能会掩盖驱动亮度-环境关系的差异。
英文摘要
The ongoing use of Type Ia Supernovae (SNe Ia) as standardisable candles relies on an additional correction for the relationship between their standardised brightnesses and host galaxy properties. Currently, this correction is built on host stellar mass, typically derived from optical-only SED fitting, which recent analyses suggest may not fully capture the underlying environmental properties. This relationship is stronger when considering the regions closest to the SNe, rather than the galaxies as a whole. I use a sample of SNe Ia in DustPedia galaxies and \texttt{CIGALE} SED fitting to compare the local environments of 90 nearby SNe Ia against the global properties of their hosts. The UV-to-FIR coverage of DustPedia enables improved dust constraints, and helps break the age-dust degeneracy that limits optical-only studies; to my knowledge this coverage has not been previously applied to the sub-galactic regions around SNe Ia. Stellar mass and dust mass are lower locally simply because the aperture encloses less of the galaxy; however, for colour, sSFR, and dust attenuation, local values differ from the host average by more than measurement uncertainty alone allows, with attenuation showing the strongest discrepancy ($p=6.3\times10^{-5}$). Only mass-weighted age is consistent locally and globally. Galaxy-integrated properties therefore do not capture the true conditions at the SN location. SN siblings (sharing a host galaxy) only emphasise this effect. Siblings sampling the same galaxy structure, such as two SNe in spiral arms, have consistent environments, whilst others diverge. Standardising on global properties may therefore mask the differences that drive the brightness-environment relationship.
Comments17 pages, 9 figures (including appendices). Accepted in MNRAS
