Enumeration of cubic multigraphs on orientable surfaces

Abstract Let S g be the orientable surface of genus g. We show that the number of edge-labelled cubic multigraphs embeddable on S g with m = 3 k edges is asymptotically d g γ − m m 5 / 2 ( g − 1 ) − 1 m ! , where γ − 1 = 79 3 2 − 1 / 3 and c g is a constant only dependent on the genus.