The first two maximum Sombor spectral radii of bicyclic graphs

The Sombor matrix S(G) of a graph G was introduced by Gutman in 2021, in which the (i, j)-entry is equal to $sqrt(deg^(2)(u_(i))+deg^(2)(u_(j)))$ if the vertices ui and uj are adjacent in G, and zero otherwise, where deg(ui) denotes the degree of vertex ui in G. In this paper, we obtain the extremal graphs with the first two maximum Sombor spectral radii in bicyclic graphs.