http://arxiv.org/abs/2110.05760
In this letter, we report a robust measurement of the morphology and color dependences of the stellar-halo mass relation (SHMR) at the high mass end ($10^{11.3}{\rm M_{\odot}}<M_{\star}<10^{11.7}{\rm M_{\odot}}$) at redshift $z_s\sim0.6$. Applying our method, Photometric objects Around Cosmic webs (PAC), developed in a previous work to CMASS and HSC-SSP observations, we measure the excess surface density ($\bar{n}_2w_p(r_p)$) of satellites around massive central galaxies with different morphologies indicated by S\’ersic index $n$. We find that more compact (larger $n$) central galaxies are surrounded by more satellites. With the abundance matching method, we estimate halo mass for the central galaxies, and find that halo mass is increased monotonically with $n$, solid evidence for a morphology dependence of SHMR. Specifically, our results show that the most compact galaxies ($n>6$) have the halo mass around 5.5 times larger than the disk galaxies ($n<2$). Similarly, using the rest-frame $u-r$ color, we find that red galaxies reside in halos $2.6$ times larger than those hosting blue galaxies.
K. Xu and Y. Jing
Wed, 13 Oct 21
13/80
Comments: 6 pages, 3 figures, submitted to ApJL
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