The stellar mass in and around isolated central galaxies: connections to the total mass distribution through galaxy-galaxy lensing in the Hyper Suprime-Cam survey

Abstract

Using photometric galaxies from the HSC survey, we measure the stellar mass density profiles for satellite galaxies as a function of the projected distance, $r_p$, to isolated central galaxies (ICGs) selected from SDSS/DR7 spectroscopic galaxies at $z\sim 0.1$. By stacking HSC images, we also measure the projected stellar mass density profiles for ICGs and their stellar halos. The total mass distributions are further measured from HSC weak lensing signals. ICGs dominate within $\sim$0.15 times the halo virial radius ($0.15R_{200}$). The stellar mass versus total mass fractions drop with the increase in $r_p$ up to $\sim 0.15R_{200}$, beyond which they are less than 1\% while stay almost constant, indicating the radial distribution of satellites trace dark matter. The total stellar mass in satellites is proportional to the virial mass of the host halo, $M_{200}$, for ICGs more massive than $10^{10.5}{M}_{\odot }$, i.e., $M_{\ast ,\mathrm{sat}}\propto M_{200}$, whereas the relation between the stellar mass of ICGs $+$ stellar halos and $M_{200}$ is close to $M_{\ast ,\mathrm{ICG}+\mathrm{diffuse}}\propto M_{200}^{1/2}$. Below $10^{10.5}{M}_{\odot }$, the change in $M_{200}$ is much slower with the decrease in $M_{\ast ,\mathrm{ICG}+\mathrm{diffuse}}$. At fixed stellar mass, red ICGs are hosted by more massive dark matter halos and have more satellites. At $M_{200}\sim 10^{12.7}{M}_{\odot }$, both $M_{\ast ,\mathrm{sat}}$ and the fraction of stellar mass in satellites versus total stellar mass, $f_{\mathrm{sat}}$, tend to be slightly higher around blue ICGs, perhaps implying the late formation of blue galaxies. $f_{\mathrm{sat}}$ increases with the increase in both $M_{\ast ,\mathrm{ICG}+\mathrm{diffuse}}$ and $M_{200}$, and scales more linearly with $M_{200}$. We provide best-fitting formulas for these scaling relations and for red and blue ICGs separately.

arXiv commentaccepted by ApJ - comments welcome - data available upon request

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