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We study the stellar halos of $0.2\lesssim z \lesssim 0.5$ galaxies withstellar masses spanning $M_*\sim 10^{10.5}$ to $10^{12}M_\odot$ (approximately$L_*$ galaxies at this redshift) using imaging data from the Cosmic InfraredBackground Experiment (CIBER). A previous CIBER fluctuation analysis suggestedthat intra-halo light (IHL) contributes a significant portion of thenear-infrared extragalactic background light (EBL), the integrated emissionfrom all sources throughout cosmic history. In this work, we carry out astacking analysis with a sample of $\sim$30,000 Sloan Digital Sky Survey (SDSS)photometric galaxies from CIBER images in two near-infrared bands (1.1 and 1.8$\mu$m) to directly probe the IHL associated with these galaxies. We stackgalaxies in five sub-samples split by brightness, and detect an extended galaxyprofile, beyond the instrument point spread function (PSF), derived by stackingstars. We jointly fit a model for the inherent galaxy light profile, pluslarge-scale one- and two-halo clustering to measure the extended galaxy IHL. Wedetect non-linear one-halo clustering in the 1.8 $\mu$m band, at a levelconsistent with numerical simulations. Our results on the galaxy profilesuggest that $\sim 50\%$ of the total galaxy light budget in our galaxy sampleresides in the outskirts of the galaxies at $r > 10$ kpc. We describe thisextended emission as IHL and and are able to study how this fraction evolveswith cosmic time. These results are new in the near-infrared wavelength at the$L_*$ mass scale, and suggest that IHL has a significant contribution to theintegrated galactic light, and to the amplitude of large-scale backgroundfluctuations.

Probing Intra-Halo Light with Galaxy Stacking in CIBER Images