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

Jiahua Wu, Huifang Xie, Liming Dou +6

We present a systematic investigation of long-term mid-infrared (MIR) color variability in 1,718 Narrow-Line Seyfert 1 galaxies (NLSy1s) using 14-year \textit{WISE}/NEOWISE monitor…