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Subaru Seminars are
usually held in Room 104 of the Hilo Base Facility, adjacent
to the main lobby. Everyone is welcome to attend. If you would like to
give a seminar, please contact Subaru seminar organizers
(Rusu Cristian Eduard, Tae-Soo Pyo, Nagayoshi Ohashi)
by email : sseminar_at_subaru.naoj.org (please change"_at" to @).
April 13, Friday, 11am in 104A
" Evidence for the existence of abundant intracluster light at z>1"
Jongwan Ko (KASI)
Intracluster stars are believed to be unbound from their progenitor galaxies and diffused throughout the galaxy cluster, creating intracluster light (ICL). However, when and how exactly these stars form are unclear to date. To directly constrain the origin, one powerful method is to study clusters at the epoch when mature galaxy clusters began to appear. In this talk, I will present measurements of the spatial distribution, color, and quantity of diffuse intracluster stars for a massive galaxy cluster at a redshift of 1.24, using exceptionally deep near-IR imaging data from HST. This is the most distant galaxy cluster to date for which those three properties of the ICL have been quantified simultaneously. Finally, I will discuss what our measurements suggest about the origin of the ICL.