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		| Paper: | 
		Evolution of Activity in Massive Gas-Rich Mergers | 
	 
	
		| Volume: | 
		357, The Spitzer Space Telescope: New Views of the Cosmos | 
	 
	
		| Page: | 
		231 | 
	 
	
		| Authors: | 
		Veilleux, S. | 
	 
	
	
		| Abstract: | 
		A summary is given of our on-going effort to study massive gasrich mergers in the local universe from the ground and from space (QUEST: Quasar/ULIRG Evolutionary Study). A Cycle 1 medium-size Spitzer program will complement this effort by providing valuable information on the energy production mechanisms in these objects, and the obscuration and physical conditions along the merger sequence. | 
	 
	
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