A Tidal Tale: The Origin of Intra-Cluster Light in an Assembling Galaxy Cluster at z=0.37

Details A Tidal Tale: The Origin of Intra-Cluster Light in an Assembling Galaxy Cluster at z=0.37 A Tidal Tale: The Origin of Intra-Cluster Light in an Assembling Galaxy Cluster at z=0.37

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80104t&link_type=abstract

Spitzer Proposal ID #80104

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Scientific paper

We propose to obtain IRAC mosaics at 3.6 and 4.5 microns of a super galaxy group at z=0.37 to trace the origins of Intra-Cluster Light (ICL) and quantify the ICL's role as a stellar reservoir. Our target SG1120 is composed of four X-ray luminous galaxy groups at z=0.37 that are gravitationally bound to each other and will merge to form a cluster comparable in mass to Coma. SG1120 is an optimal system for studying how the ICL forms because the ICL dominates the total stellar budget on group scales and SG1120 contains multiple (massive) merging members. Three of the four Brightest Group Galaxies are growing via major merging, and the BGGs have asymmetric stellar plumes visible in our r' imaging. At least 5 additional SG1120 members have extended tidal features. Only by combining IRAC imaging with our multi-wavelength dataset (optical/X-ray/radio imaging, 174 spectroscopically confirmed SG1120 members) can we trace the physical extent of these diffuse stellar structures and measure their total flux (mass) and colors (ages, metallicities). We can then trace how the ICL forms, e.g. by tidally stripped stars from L* galaxies or disrupted dwarfs, and thus better understand how the total baryon distribution (galaxies, ICL, X-ray gas) evolves in these massive halos.

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