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SPHEREx 的漫射银河背景:背景建模及其对消光影响的初步研究

Diffuse Galactic Backgrounds with SPHEREx: A Pilot Study of Background Modeling and Its Impact on Extinction

Wanggi Lim, Jae Hwan Kang, Keunho J. Kim, Young-Jun Kim

arXiv 2610.04780首次发表:更新:

发表机构

California Institute of Technology; Seoul National University(加州理工学院; 首尔大学)

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 SPHEREx 数据在银河系平面试点场进行光谱分析,通过大中值滤波构建背景图,评估背景模型差异,证明光谱测绘能有效控制漫射背景系统效应,改进尘埃消光约束。

AI 中文摘要

我们利用 SPHEREx 数据在银河系平面上的一个试点场中,对漫射银河背景辐射进行了光谱分析,在该场中,漫射红外背景估计的不确定性是近红外和中红外波长消光研究中系统不确定性的主要来源。我们采用大中值滤波方法,在 0.75--5~$\mu$m 范围内构建了通道分辨的背景图,并仅对 $\lambda \geq 3~\mu$m 的更干净的长波子集进行消光分析。在当前场中,与早期掩模中值背景模型相比,逐通道背景差异的中位数约为 6%,在 3.205~$\mu$m 附近的最大变化为 $|\Delta\tau_{\rm norm}|\simeq 7.4$,这强调了波长相关背景建模的重要性。这些结果表明,SPHEREx 的光谱测绘为控制漫射背景系统效应提供了一个实用框架,并能够改进对银河系平面尘埃不透明度和消光的约束。

英文摘要

We present a spectral analysis of diffuse Galactic background emission using SPHEREx data in a pilot Galactic-plane field, where uncertainty in the estimation of the diffuse infrared background is a major source of systematic uncertainty in extinction studies at near- and mid-infrared wavelengths. We construct channel-resolved background maps across the 0.75--5~$μ$m range using a Large Median Filter approach and then carry the extinction analysis forward only for the cleaner long-wavelength subset at $λ\geq 3~μ$m. In the present field, comparison against an earlier masked-median background model gives a median channel-by-channel background difference of about 6\% and a maximum change of $|Δτ_{\rm norm}|\simeq 7.4$ near 3.205~$μ$m, underscoring the importance of wavelength-dependent background modeling. These results demonstrate that spectral mapping with SPHEREx provides a practical framework for controlling diffuse background systematics and enables improved constraints on dust opacity and extinction in the Galactic plane.

Comments16 pages, 5 figures, accepted for publication in ApJ

论文原文

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