The buildup of the intracluster light of Abell 85 as seen by Subaru's Hyper Suprime-Cam

Abstract

The study of low surface brightness light in large, deep imaging surveys is still uncharted territory as automated data reduction pipelines over-subtract or eliminate this light. Using archival data of the Abell 85 cluster of galaxies taken with Hyper Suprime-Cam on the Subaru Telescope, we show that using careful data processing can unveil the diffuse light within the cluster, the intracluster light. We reach surface brightness limits of ${\mu }_g^{limit}$(3$\sigma$, 10"x10") = 30.9 mag/arcsec${}^2$, and ${\mu }_i^{limit}$(3$\sigma$, 10"x10") = 29.7 mag/arcsec${}^2$. We measured the radial surface brightness profiles of the brightest cluster galaxy out to the intracluster light (radius $\sim 215$ kpc), for the g and i bands. We found that both the surface brightness and the color profiles become shallower beyond $\sim 75$ kpc suggesting that a distinct component, the intracluster light, starts to dominate at that radius. The color of the profile at $\sim 100$ kpc suggests that the buildup of the intracluster light of Abell 85 occurs by the stripping of massive ($\sim 10^{10}{M}_{\odot }$) satellites. The measured fraction of this light ranges from 8% to 30% in g, depending on the definition of intracluster light chosen.

Accepted for publication in ApJ. Figures 6 and 8 show the main results of the paper

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