AI 中文总结
该研究结合特定目录与成像绘制附近星系千秒差距尺度下的2175埃吸收峰，用两种互补方法估计，比较吸收峰强度与多种诊断，发现其与多种因素的关系，支持2175埃载体的局部辐射场处理。
AI 中文摘要
我们将SwiM_v4.2 Swift/UVOT+MaNGA目录与2MASS $K_s$成像相结合，以绘制附近星系千秒差距尺度下的2175埃吸收峰。我们使用两种互补的估计方法：一种紫外到近红外消光曲线方法，为2487个高连续谱信噪比的空间像素得出$A_{bump}^{UOIR}$和$B$；以及Battisti等人（2025年）的仅NUV方法，为7934个空间像素得出$A_{bump}^{NUV}$和$k_{bump}$。两种绝对吸收峰估计在重叠处吻合良好。我们在分离恒星形成（SF）和非SF区域后，将吸收峰强度与局部恒星种群、发射线、消光曲线和几何诊断进行比较。最强的吸收峰出现在低特定H$\alpha$表面亮度，$\Sigma_{\text{H}\alpha}/\Sigma_\ast$处，特别是在非SF区域，该比率追踪单位恒星质量的电离气体发射而非特定恒星形成率。吸收峰也随EW(H$\alpha$)减弱，随$D_n4000$和恒星年龄增强。相比之下，金属丰度、倾角、星系中心半径、$A_V$和光学消光曲线斜率是次要预测因素。绝对强度$A_{bump}^{NUV}$随$\Sigma_{\text{H}\alpha}$和$\Sigma_\ast$增加，而相对强度$k_{bump}$和$B$则不然，表明绝对吸收峰幅度部分遵循尘埃柱，而归一化强度更好地追踪有效吸收峰突出度。这些结果支持2175埃载体的局部辐射场处理。
英文摘要
We combine the SwiM_v4.2 Swift/UVOT+MaNGA catalog with 2MASS $K_s$ imaging to map the 2175Å attenuation bump at kiloparsec scales in nearby galaxies. We use two complementary estimators: an ultraviolet-to-near-infrared attenuation-curve method, yielding $A_{bump}^{UOIR}$ and $B$ for 2487 high-continuum-S/N spaxels, and the NUV-only method of Battisti et al. (2025), yielding $A_{bump}^{NUV}$ and $k_{bump}$ for 7934 spaxels. The two absolute bump estimates agree well where they overlap. We compare bump strength with local stellar-population, emission-line, attenuation-curve, and geometric diagnostics after separating star-forming (SF) and non-SF regions. The strongest bumps occur at low specific H$α$ surface brightness, $Σ_{\text{H}α}/Σ_\ast$, especially in non-SF regions, where this ratio traces ionized-gas emission per unit stellar mass rather than sSFR. The bump also weakens with EW(H$α$) and strengthens with $D_n4000$ and stellar age. In contrast, metallicity, inclination, galactocentric radius, $A_V$, and optical attenuation-curve slope are secondary predictors. The absolute strength $A_{bump}^{NUV}$ increases with $Σ_{\text{H}α}$ and $Σ_\ast$, while the relative strengths $k_{bump}$ and $B$ do not, indicating that absolute bump amplitude partly follows dust column whereas normalized strengths better trace effective bump prominence. These results support local radiation-field processing of the 2175Å carriers.
Comments14 pages and 10 figures in total (with 9 pages + 4 figures in the main text), submitted for publication in ApJ
