Photometric Objects Around Cosmic Webs (PAC) Delineated in a Spectroscopic Survey. II. Morphology, Color, and Size Dependences of the Stellar–Halo Mass Relation for Massive Galaxies

Abstract

In this paper, we report a robust measurement of the morphology, color, and galaxy size dependences of the stellar–halo mass relation (SHMR) at the high-mass end (10 11.3 M ⊙ < M ⋆ < 10 11.7 M ⊙ ) at redshift z s ∼ 0.6. 3 3 Throughout the paper, we use z s for redshift and z for the z -band magnitude. Applying our method, Photometric objects Around Cosmic webs (PAC), developed in a previous work to Baryon Oscillation Spectroscopic Survey and Hyper Suprime-cam Subaru Strategic Program observations, we measure the excess surface density ( n ¯ 2 w p ( r p ) ) of satellites around massive central galaxies with different morphologies indicated by the Sérsic index n . We find that more compact (larger n ) central galaxies are surrounded by more satellites. With the abundance matching method, we estimate the halo mass for the central galaxies and find that it increases monotonically with n , solid evidence for a morphology dependence of the SHMR. Specifically, our results show that most compact galaxies ( n > 6) have a halo mass around 5.5 times larger than disk galaxies ( n < 2). Similarly, using the effective radius R e and the rest-frame u − r color, we find that red (large) galaxies reside in halos that are in average 2.6 (2.3) times more massive than those hosting blue (small) galaxies.