Long-term Mid-infrared Color Variations of Narrow-Line Seyfert 1 Galaxies

This article reports on research into the long-term mid-infrared color variations of Narrow-Line Seyfert 1 Galaxies. The analysis likely involves observational data and potentially modeling to understand the underlying physical processes causing these variations. The focus is on understanding the behavior of these galaxies in the mid-infrared spectrum over extended periods.