NOAO >   Observing Info >   Approved Programs >   2016B-0625

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Program Information for 2016B-0625


PI: E Wilcots, U. of Wisconsin, Madison, ewilcots@astro.wisc.edu
Address: 2535 Sterling Hall, Madison, WI 53706 USA

CoI: Louise O V Edwards, Yale U.

Title: The Role of Close Companions in the Formation of Brightest Cluster Galaxies and Intracluster Light

Abstract: Several puzzles continue to plague our understanding of the formation of Brightest Cluster Galaxies (BCGs). We will address the following ones in this proposal: 1) How are star forming BCGs, especially those outside of cool core clusters, fueled? And why has the otherwise effective quenching mechanism failed to work in these galaxies? 2) What is the age and metallicity of the accumulated stellar mass? And can these be understood simultaneously in hierarchical galaxy formation models. 3) How does the intracluster (ICL) form? Is it a natural extension of the outer envelope of BCGs? We examine each of these questions with WIYN SparsePak IFU-like observations of a unique sample of a sample of low redshift galaxy clusters. This leads to a spectral analysis of the BCGs, their close companion galaxies, and for the first time, a {it spectroscopic sample of ICL.} We determine star formation rates, stellar ages and metallicity of each component. We will directly measure the role of interactions and close companions in the build-up of the BCG and ICL, providing new and important observational constraints on models of galaxy evolution.

Program Type: WTAC

Scheduled Nights:
Run 1 (2016B):  WIYN/SPSPK -- 3n on Dec 04 - Dec 06 2016


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2016B-0625

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