[astro-ph.GA] We investigate the ability of SPHEREx observations of the 3.3 μm polycyclic aromatic hydrocarbon (PAH) emission feature to trace Galactic dust reddening.
![SPHEREx 3.3 µm PAH emission in a 22◦ by 22◦ centered on the north ecliptic pole. The pixel scale is 6′′ .2. Values are computed based on the method described in Section 2.1 and many, though not all, of the point sources are removed in that procedure. For the purpose of visualization in this figure, we have used CloudClean.jl to inpaint masked pixels such as those vacated by point source masking (A. K. Saydjari & D. P. Finkbeiner 2022). -- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/11/Tracing.png?resize=1200%2C716&ssl=1)
[astro-ph.GA] We investigate the ability of SPHEREx observations of the 3.3 μm polycyclic aromatic hydrocarbon (PAH) emission feature to trace Galactic dust reddening.