Kavli Affiliate: Eric D. Miller
| First 5 Authors: , , , ,
| Summary:
We present the analysis of the intracluster light (ICL) in three fossil
groups (FG), RXJ085640.72+055347.36, RX J1136+0713, and RX J1410+4145, at z ~
0.1. We used two optical broad-band filters, F435W and F606W, observed with the
Hubble Space Telescope and spectroscopic data obtained with the Gemini
Multi-Object Spectrograph to generate the ICL maps and measure the ICL fraction
using CICLE, an algorithm developed to disentangle the ICL from the light of
galaxies. We found ICL fractions of 9.9% – 14.4%, 3.8% – 6.1%, and 4.7% – 10.7%
for RXJ0856, RXJ1136, and RXJ1410, respectively. This behavior is not
consistent with the presence of the ICL fraction excess previously observed in
merging clusters and also inconsistent with the constant ICL fraction
distribution characteristic of relaxed systems, although the values found are
within the typical range expected for the latter. Instead, they show a
significantly increasing trend with wavelengths over ~ 3800 – 5500A, indicating
that fossil groups are indeed old and undisturbed systems, even compared with
regular relaxed clusters.
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